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Stock vortec 350 cam specs?
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Stock vortec 350 cam specs?
Ram Jet 350 Small Block Crate Engine | Chevrolet Performance Here is one article that says max lift on stock vortecs is only. Machined and assembled in the USA. 448 lift, works fine with stock converter. 7L Steel Crankshaft 1986-2005 (1pc rear main seal engines). 470" lift) on a set of stock Vortec heads. com ones corvette cam Performer intake 600 holley single corvette cam specs: This hydraulic flat tappet is used on the 65-67 Corvette and Chevy II L-79. I'm sure that's really pushing it on valve lift for stock vortec heads. Much more important to get the total timing right. Set the timing at 10 degrees and you have almost a perfect setting of 34 degrees. I know it possible to build a 5. Camshafts Melling offers a full line of OE replacement camshafts for cars, light duty, medium duty and heavy duty trucks. Modifier 3959180 Mechanical Flat Tappet This mechanical flat tappet is a ZL-1 and LS-7 mechanical lifter competition cam, good in 427-454. Many people use them with boost or nitrous. Lunati Bare Bones 224/234 Hydraulic Flat Cam Lifter Kit (10120102LK) 3. The smallest cam used in a SBC is the LG4/L03 305 cam050 on a 109 LSA with 0385 lift. 1. 0 compression, 600 vac sec. 3 small block engine as it came from the factory. This cam provides the industry-best overlapping performance with massive horsepower and torque boost. 5cc dish pistons deep in the hole (rebuilder pistons), vortec heads with guides turned down & LT4 springs, voodoo 262 cam, topped by an RPM intake and 750cfm vac. Price has recently gotten a bit steeper than it was is the only downside. this cam was also used in the 1994-96 L99 4. Price has recently gotten a bit steeper than it was is the only downside. voodoo 60102: cam specs: 262/268, Lift 489 I want to run the best cam for stock vortecs: seems consensus may be voodoo 262? Will this cam work with stock vortec springs or the comp 981's? the max. 550 lift? Thumpr 227/241 Hydraulic Flat Cam and Lifter Kit for Chevrolet Small Block 262-400. I have been studying Cam Specs and reading articles about various Vortec builds, but most of the articles are trying to squeeze every last ounce of HP they can out of them and they rarely discuss streetablilty L31 350 with stock Vortec heads except that I will do the valve guide. Hogg. Find out more about the 1965-1966 Shelby GT-350. At max lift with the stock 1. Straight mill up to 080” with low CR of 10 to 1 or less100” is living on borrowed time. Feb 7, 2019 · The 4. That is out of Competion Products. The L31 Vortec 350 that was installed in all GM half ton trucks (Pick-ups, Tahoes, Suburbans, Vans) put out 255 hp and 330 lb-ft. Iberia is offering one of the most lucrative airline promotions that's come around in a long time Unearth the perfect landscaping business name with our creative suggestions and practical advice. 0 compression, 600 vac sec. What will happen if I install 1. May 31, 2017 · This cam with L31 heads is good for about 350 horses SAE at gross (no accessories, dyno headers and exhaust, no mufflers. Its pointless to recommend something unless we know everything about the car. How To Run 11s With Stock Iron Heads And A Simple Shot Of Nitrous. Mar 4, 2024 · 350 HP SBC 350 Build Recipe. For marketing purposes, it was also known as the Vortec 6200. 210c heads for 6250+ rpm. The engine specs and information listed here is for a stock L94 engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM. The torque specifications for Chevrolet 350 cubic inch V8 head bolts are 65 foot-pounds per bolt if securing the stock cast iron head. From cylinder heads to the camshaft, here's a complete rundown of all the vital engine specs you need for the 6 What exactly are "Vortec heads"? Beginning in 1996 to '00, L-31 Vortec heads were installed from the factory on GM truck and van 350 engines. The following change may be necessary for correct engine assembly: For LT1 and L98 engines (pre-1996) the dowel pin in the end of the camshaft must be pushed in so extension from end of cam. These are ready to bolt on speed kits, and go fast. , a 283 will like more than a 327 or 350, and a 383 or 406 will like even less. The L31/Vortec engine uses 12cc dish pistons as well with an advertised CR of 9. 050" lift and lift at the seat 2855" lift at the valve of 0428" on a 111ºLSA. Moly and other lubes offer reduced friction and increased bolt tension, which will affect the torque. It had a displacement -- the amount of air and fuel exited from an engine during a full cycle --of 5,735 cubic centimeters, and compression ratio -- the maximum engine volume. Back in July, T-Mobile agreed to pay out $350 million to settle a class-action lawsuit brought by. ) 5060 posts · Joined 2013 You will have somewhere from 94:1 w/o decking heads. We retained the stock Vortec springs to break in the cam. The stock 1996-98 Vortec 350 (and Vortec 305-use the same cam) has specs of 191º/196º dur @0412"/0 The cams would swap easily enough, depending on what failed on your Vortec 350. All blocks are 4 bolt main. It will be a daily driver for the street. All blocks are roller camshaft ready. I'm trying to find a good cam for my application and. Spec work has long been a point of contention between agencies and clients. 050 242/254 LSA 116 3863151 L79 327 - 350 hp HYDRAULIC Lift 440 or 447 both listed Dur @. I'm trying to find a good cam for my application and. Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you are considering buying a Chevrolet 350, or to replace your cam, you should consider the best camshaft for this engine. Cam options, Melling MTC-1 for a flat tappet replacement. I am building a new engine to match the other one that didn't blow up! Like. I used a cam from Isky. It is a Vortec 350 The truck weighs about 5000 lbs. 447 lift, 222 dur, LSA 114) 3896962 L82 late 70's vette HYDRAULIC I estimate with the original bottom end of the 350/290 combined with the vortecs and performer intake, im around 9 It was 8. 050" tappet lift (intake/exhaust) is 222/222. and Iron Vortec Bowtie heads; Kit for 5 Includes 16 P/N 10212808 lightweight retainers. Run with the new induction system and stock cam, the low-compression, Vortec-headed 350 produced 277 hp at 4,500 rpm and 352 lb-ft of torque at 3,600 rpm Run with the stock flat-tappet cam. The L76—like its LS2 sibling—is a 6 4, aluminum small block engine that was used both in GM cars and trucks. OR, perhaps takeout Gen II LT1 or LT4 cams. 050 will pick up almost 50 hp from stock. I used a timing set for a factory chevy roller cam and just pushed the dowel in farther and used a cam plate, my block was already drilled for a cam plate Used flat top pistons and Vortec heads with a carb manifold. , a 283 will like more than a 327 or 350, and a 383 or 406 will like even less. Feb 12, 2024 · Overhead Valve (OHV) Maximum RPM. Performance Specifications. 050 will pick up almost 50 hp from stock. Specifications: 4 bolt main with 2 piece rear main seal. Earth is seeing an unprecedented lo. leq ap euro examples If it is the base 350 then it is a stock GM engine non forged internals. Buy a package system. The Ramjet (#14097395) cam would also be a good choice for a driver. The Comp Cams beehive 26120 springs and 1795-16 tool steel retainers would drop right on. Edelbrock 2102 Performer-Pus Camshaft and Lifter Kit Get the Best Performance with Chevrolet Performance Hydraulic Roller Camshaft 10241264 parts at JEGS Hydraulic Roller Camshaft; GM 57L Vortec. They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Will work with installed springs on Ramjet 350, HT383 and Vortec L31 heads Specifications: Part Type. The engine specs and information listed below is for the stock L20 engine. The engine specs and information listed here is for a stock L94 engine. Replacement Chevy 350 Vortec light-duty engine will provide the OE horsepower and torque specifications while offering added durability over the factory engine. What cam for stock 1995 tbi 350 truck motor I have a 1995 tahoe with the tbi 350 and I want to put cam in it nothing crazy just something to give it a nice sound n maybe give it a little more but dont what kind or specs I don't want to change Anythibg but the cam everything else stock please if u can help thank you Find 1996 CHEVROLET 5. The ZZ4 cam will get you nowhere near your goals with 208/221 duration480" lift on stock L31 heads will require 787-16 Comp Cams retainers and any Beehiove spring, 26915/26918, PAC beehives or 02-04 LS6 behives. edge joi One thing to remember is that the Vortec heads are limited to. Engines with the more efficient "heart shaped" combustion chambers in the heads - like the Vortec, Fast Burn, or some aftermarket heads - those generally don't need or want as much ignition advance either. For marketing purposes, it was also known as the Vortec 6000. Oil is especially interesting as it is deemed the cheapest. Oil is especially interesting as it is deemed the cheapest. The advent of modern engines that make 400 hp or more has colored the reality of the past. The clever valve design makes for efficient exhaust release. Or, if looking to swap parts over for an OEM roller: 12551705 350 LT1 93-95 roller 201/208 @447 intake/. The factory heads are in bad shape and besides, the Vortec heads would give some performance boost. RECOMMENDED 350 TBI MODS First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. Dont know stock LS1 info. The 1996-2000 350ci Vortec 5700 engines enjoy lots of aftermarket support to help. 454 - Turbo 400 - 3 I was trying to find Stock OEM 454 Cam Specs so I'd know what the starting point would be when I decide to upgrade my cam and intake. In addition, I think for comp cams it's recommended to go 1/2 turn past zero lash on valve lash. Here's what happened when I ran a Competition Cams Comp Magnum 270H (. ihs pharmacist pay scale 2022 The L31 vortec cam is 202/207, 424, 115 lca. Setting the ignition timing on a 350 engine means you synchronize the rotation of the distributor with the rotation of the crankshaft. Vortec RPM Intake, 750 holley vac 2nd, stock 350 cast bottom end, ps, pb. 52:1 for the '99 'Burb 5 The actual CR could be a tenth or so lower. Since this can represent a significant investment, it is helpful to know the life expectancy of different. We already know that a "stock" vortec 350 with a 4bbl carb will make 290-300hp, at the prop, depending on. 459 inches of lift and 117 degrees of lobe separation angle. This cam provides the industry-best overlapping performance with massive horsepower and torque boost. Currently running a dual plane gm perf intake and a sniper efi with hei and pulls really good. The stock 1996-2003 Vortec 350 L31's were rated at 255 SAE net hp @ 4600rp,m and 330 lb/ft torque@ 2800rpm. by mt-engines » Sat Dec 21, 2019 4:31 pm. I know the basic rules for sbc's but am hoping for a more specific starting point. L31-R cam upgrade. I went with a Lunati cam with 204/214 duration at 420/. Hey All, I need to find out the compression ratio of my 96-00 stock 350 5. so far every seal that's came with the engine has failed. Nov 4, 2019 · Description Price.
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1 liter (496-cid) V8 that was in production from 2001-2006. Depending on what you read, suggested max safe lift varies from 480". A stock Vortec 350 is rated at 255sae net hp@4600rpm and 330 lb/ft torque @2800rpm. Something like 196* @ 050 exhaust,. 6 inches (117 millimeters) wide36 inches thick (9. Referred to as a "small-block" for its size relative to the physically much larger Chevrolet big-block engines, the small-block family spanned. The lobe center-line specification of the intake valve is 105 degrees, and the lobe separation specification of the exhaust valve. Jun 1, 2008 · C. The Chevrolet small-block engine is a series of gasoline -powered V8 automobile engines, produced by the Chevrolet division of General Motors between 1954 and 2003, using the same basic engine block. Cheap is cheap for a reason. The clever valve design makes for efficient exhaust release. Civvie L05 cams had wimpy lift figures of 385" exhaust (at the valve!). Start planning your trip to Hawaii now, with round-trip fares to the island state from $350. 1L engine produced 340hp and 455lb-ft. I'm currently pulling the heads off to go get a valve job and resurfacing. The L48 cam is a stock cam and is also used in the 250hp 350. Re: Cam Specs for Mercruiser 260hp? for future reference, for an off the shalf cam to use in a near stock or slightly modified 350 - especially with stock exhaust, something like a comp xm-256 grind is a good all around cam and a pretty safe bet. This will get you around 1hp/1c and even more on torque: Cam - $300. Aug 20, 2014 · GM SPO 357HP 350 crate engine cam is my go to cam now050, Its a baby hotcam designed for a L31. Works well with N2O and superchargers/234 exh/304 exh466 int487 exh From low-end torque to top-end horsepower--and everything in between--one of our Summit Racing™ classic cams has you covered. 48-inch stroke as the low-compression model, but the compression rating was raised to 9 This 5. 460 lift cam on the specs - and most everything you read says thats too much for stock Vortecs. king seal I figured the 305 would have a slightly milder cam but that will work just fine for what I have in mind. Comp Cams grind 346S (. Complementing the cam, we increased the rocker ratio from the stock 16:1 with a set of COMP Magnum rockers, bumping the valve lift delivered by our cam from 0563 inch in the. 050 lift, max lift, etc)? I want to know what i'm starting out with, so I know how big the cams are compared to what I have already. Oct 13, 2022 · The L48, the original 350 small block engine, is one of the most legendary. What will happen if I install 1. 451" lift and it's ground on 109 LSA. 7L OHV V8 Vortec Hydraulic Roller Camshaft00. This is a custom order part. A 1997 Vortec 350 out of a 1 ton truck all stock except for the following items. Learn everything you need to know about spec homes in The Homeowner's Guide. Mar 1, 2010 · Just as Chevy had done when it replaced the L76 327 with the LT-1 350, it altered the cam timing for the larger motor when it created the 350hp L46 350. I have '98 vortec heads on my 350, and using standard Z28 valve springs without cutting the spring pockets on the heads, resulting in some nasty coil bind Will this give me any problems with the stock vortec valve springs? Cam specs: Crane Energizer hydraulic flat tappet 272* advertised duration and 1 You can use stock length pushrods with all of the above, if you have a stock camshaft. The specifications of the GM 4. Specifications: Power: 330 HP @ 5000 RPM, 380 ft of torque @ 3800 RPM Displacement: 350 CID, 500” x 3. flalottery The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Advertisement Kindle Paperwhite measures 6. I have a gen 1 350 block that's been rebuilt with. Was a recent rebuild, stock 22. 7 liter L31 Vortec in several of its trucks, including the Chevrolet C/K, the Cadillac Escalade and the GMC Yukon. The specifications of the GM 4. 3 small block engine from General Motors used in cars from 1997-2004. Edelbrock 2102 Performer-Pus Camshaft and Lifter Kit Re: '97 Vortec cam specs??? 12-17-04 05:34 PM - Post# 577299. Comp bills the XE268H as having a 1,600-5,800-rpm operating range, compared with the 268H High Energy's 1,500-5,500-rpm range. Specs on the TBI are flat wrong. These newly designed for 1996, state of the art heads are made from cast iron and replaced the former swirl-port TBI heads that had been previously used on the GM truck 350. Something like 196* @ 050 exhaust,. Has good low to mid range power for pulling trailer or rv. Its highest output was 300 hp and 380 lb-ft of torque, before it was slowly neutered for emissions. The high-lift camshaft gives the engine its own unique, aggressive idle. 485 lift, 254 dur, LSA 114) 3972178, 3972182, 12364054 1970 Z28 350 - 360 hp Lift 485 Dur @. Stock TBI 350 truck cam is 194/203 @ 0390/0. 2:1 compression with 9. This cam is great for additional bottom end torque. Last winter I added a set of upgraded Vortec heads, RPM intake, HEI, headers and a Voodoo 60101 cam to the stock (dish piston) 350 short block in my '67 Malibu. helping the new frontier read theory answers The compression ratio of the engine varies depending on the specific model and can range anywhere from 825:1. Something like 196* @ 050 exhaust,. ALL NEW ! Vortec 96-02 350 L31 Crate Engine - IN STOCK ! 1943278000. I’m now going to share my final best performance cam for your 5. Introducing the CHOPacabra cam! This is a nasty little beast of cam Dyno Test Motor Specs: Stock Gen IV 5. Roller Tip Rocker Arms and Push Rods. My question is really whether the stock Vortec heads with a cam lift under. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick—heck, even Saab. Upgraded springs in the heads good to 520 lift, rebuilder pistons apparently cut 0 Pistons are dish part #H699dcp/H815dcp Std. The 1965-1966 Shelby GT-350 was really a souped-up Mustang 2+2 fastback with a few modifications. All blocks are roller camshaft ready. also still working on my options with the pistons/deck/head gasket. And here is the stock Vortec 305/350 L30/L31 intake manifold Its cam has specs of 196°/206º and is the same cam that is used in the 350 hp Ramjet 350 crate engine as well as most SBC Mercruiser marine engines. Mar 9, 2019 · Re: 350 TBI Cam. He will need small cc heads to boost compression, a 64cc head will give your near 9:1 compression some of the 305ho Camaros ran 58cc heads but they had small intake valves. At the end of the day horsepower, while important, isn't everything, especially for street use. Somewhere I saw 9. LT1 Cam in L31 (Vortec 350) So I recently bought a 1996 Tahoe 2 door 4x4 with 3. 42 rear gear, stick with the stock Vortec 350 cam or Ramjet 350/HT383 camshaft.
Boondoggle, Aug 16, 2017 Aggressive-Performance Cams. A carbed Vortec 350 even bone stock will put plenty of smiles on your face when you hit the gas when compared to your stock carb 305 I have a Chevy 350 small block I am building for my 59 apache. This Cam-type comes with a noticeable feature of a 9. The MTX Blue Thunder 10 is a car-audio subwoofer. you just have to weld bungs of the injectors. 1 liter (496-cid) V8 that was in production from 2001-2006. across the obelisk elemental brawl Our review outlines the cost and specs of the Tesla Powerwall to let you know if it is worth the investment in addition to your solar power system. When comparing mechanical roller to hydraulic roller cam specs, remember to subtract the lash from the mechanical roller lifter's net valve lift numbers. Jun 13, 2011 · Unmodified heads w/stock retainers and seals will allow somewhere between 0470" lift- but this has to be verified on a per head basis. by mt-engines » Sat Dec 21, 2019 4:31 pm. 5463 posts · Joined 2008 Hello guys I got me a used vortec 350 small block that coming in the next few months I am going to re fresh it with new gaskets and I am going to take out the factory vortec roller cam and I am going to buy a ramjet 350 hydraulic roller cam 14097395 which specs at 288/308 196/206@50 431/451 lift 109 lsa. Well, I don't own a Chevelle guys, but this is probably the best Chevy forum site out there, and I do own a '90 454SS truck and have a lot of cam questions with the following engine-. youtube nove turske serije sa prevodom I'm currently pulling the heads off to go get a valve job and resurfacing. 454 - Turbo 400 - 3 I was trying to find Stock OEM 454 Cam Specs so I'd know what the starting point would be when I decide to upgrade my cam and intake. It has factory Vortec heads, hydraulic roller cam, and it's 9 The motor was freshened up with all stock internals and stock Vortec heads. 48” Compression Ratio: 9. menards stair railing Chevrolet Performance Hydraulic Roller Camshafts These Chevrolet Performance hydraulic roller camshafts feature a special lobe pattern for balanced intake and exhaust flow. Fuel Pressue Required If you have any questions or need help, feel free to contact our teamO. I have a Vortec 350 long block out of a 98 Silverado and 350 transmission. O motor , the internals are all stock and i want to switch out the cam it came with for one that has a real nice lopey idle. Here is what I have in my firebird. Fuel Pressue Required If you have any questions or need help, feel free to contact our teamO. Jan 3, 2016 · The timing of the stock L31 cam is very close to the old 300 horse 327 and used again in the 350 however the L31 cam is a hydraulic roller which keeping an OEM style roller is a very good idea. Jan 3, 2016 · The timing of the stock L31 cam is very close to the old 300 horse 327 and used again in the 350 however the L31 cam is a hydraulic roller which keeping an OEM style roller is a very good idea.
The motor is a L-31 350 from a '98 1500 series pick-up. 7 Vortec w/ Roller Cam Jump to Latest 35K views 19 replies 11 participants last post by Busted Knuckles Jun 15, 2017 T thelowerigo65 Discussion starter 8 posts · Joined 2007 #1 · Oct 3, 2007 Which year range, and car/truck models came with the 5. The stock cams that came on ALL 1996-2003 L31 Vortec 350's use a cam with lift specs of 0428" 191/196° on a 111º LSA. Many people use them with boost or nitrous. Summit has a Heads, cam, intake, gaskets, package for $1300 that claims 400+ hp. Apr 28, 2012 · from MN. 4 inch lift at the valve. And here is the stock Vortec 305/350 L30/L31 intake manifold Its cam has specs of 196°/206º and is the same cam that is used in the 350 hp Ramjet 350 crate engine as well as most SBC Mercruiser marine engines. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). (GM has a newer version of this cam with less intake duration for use in 95:1 compression engines. * Specs : Standard Size Main / Rod Journals. the HT383 that GM sells uses a 196°/206° duration at 50" with lift of 451" on a 109° LSA. ) 5060 posts · Joined 2013 You will have somewhere from 94:1 w/o decking heads. this cam was also used in the 1994-96 L99 4. I'm using a retrofit roller cam from Comp with 487 exhaust lift. womans pov Strong low end and mid-range torque, 1,000-5,200 RPM, 210/218 Duration at 111 Degree Lobe Separation Angle, 0462″ Valve Lift SB Chevy 283 327 350 400 Hi-Perf RV Cam & Lifter Kit - Preferable For Mid-range Performance. The earliest 265 and 283 small-blocks relied on an iron Power Pack head that featured 58-cc chambers and tiny 150-inch valves. but use a stock or new edel low rpm intake. stock compression height pistons piston dish/valve relief----compression 7cc -- 935 18cc -- 8. Want to swap the ramjet intake for looks and more power hopefully. wwwcom has some info on early chevys. 4 inch lift at the valve. The L31/Vortec engine uses 12cc dish pistons as well with an advertised CR of 9. 3 small block engine used in GM trucks between 1999 and 2007. Mar 1, 2018 · Last updated on 05/06/20243L, Gen. I will soon be installing a g crate 350 vortec (96-02 #12530283) with the ramjet crate cam and edel rpm intake/headers etc. You can order this part by Contacting Us. These engines are strong and durable. Those Ebay heads dont flow better than stock Vortec 350 heads unil ovcer target use of the car, rear axle ratio, cam specs. 5710 posts · Joined 2003 96-2000 chevy and GMC trucks, were the only ones to use actual vortec engines. yandere simulator rule 34 what about the distributor gear? In so far as building a 350 with Vortec heads goes you have to almost work hard to avoid a 300 horse engine where it takes little to get 350 horse and do it on regular fuel at least at the 300 level. RECOMMENDED 350 TBI MODS First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. So Dyno'd my 1998 5 K&N drop in, MSD coil, Shorty Headers, true dual 2. 451" lift and a 109 LSA. I am building a vortec 350 to swap into my truck, all I need now is the cam and then the motor can be put together. Vortec L29 Heads 99cc chamber volume (small ovals) Further Head specs-. A Small-Block 350 Crate Motor Gains 117 HP With Basic Bolt-Ons 029 inch more exhaust lift than the GM ZZ4 cam. 457 inches and a total duration of 268 seconds. Feb 16, 2011 · Somewhere I saw 9. If installed in one of these trucks, a custom computer re-program is needed. It has excellent power and torque (ID# 3863152). Cam selection for 350 with Vortec Jump to Latest 8K views 23 replies 12 participants last post by camaropwr Jan 8, 2007 E eduardo69chevelle Discussion starter 249 posts · Joined 2003 #1 · Jan 3, 2007 Lastly, we used a line chart to show what happens when installing the same camshaft into two different 350 small block Chevy V8s—one with stock Vortec heads and the other with aftermarket aluminum heads. 457 inches and a total duration of 268 seconds. Feb 11, 2023 · The LM7 5. Re: stock cam specs for 96-2000 vortec 350's? 05-19-03 05:11 PM - Post# 232720 In response to bored&stroked The compression ratio is 9. 60 valve milled 906s did not like the stock tune at all but did run pretty well with the loose 2,400 rpm. 72 Camaro 383 w/Dart pro 1's squishy lifters 3 The cam I have in mind, I've seen advertised on ebay as working well with 100% stock vortec heads is comp cams X4270HR 220/224 duration @ 474/. While it was predominantly used in the 2500HD/3500HD trucks and suburbans it was also used in a number of commercial trucks, industrial vehicles, and RV's. Ultimate guide on GM's 6. 460", cam grinders will grind the camshafts with a smaller base circles so the cam will fit through the cam bearings Is your spring height set at 1. 460" valve lift and use stock equipment. Says you need computer reprogram but ran fine out of the box. All journal sizes are given in "STANDARD" sizes.