Building an LT-4 383 Stroker from an LT-1 - Team Camaro Tech
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post #1 of 5 (permalink) Old Feb 5th, 07, 12:10 AM Thread Starter
 
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Question Building an LT-4 383 Stroker from an LT-1

I am in the process of building my LT-1 into a 383 Stroker LT-4. I want to get the AFR LT-4 heads for it but don't know which ones to get. There are about 4 different types: 215 cc LT-1 and LT-4 Raised Runner Aluminum Heads, 227cc SBC LT-4 Aluminum Heads, 220cc SBC LT-4 Aluminum Heads, 210cc SBC LT-4 Aluminum Heads, and the 195cc SBC LT-4 Aluminum Heads. Also, what size Cam Shaft should I get to gain maximum horsepower on regular pump gas and the type of pistons etc. Actually, the best process in building my engine.

Thank you

'95 Camaro Z-28

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post #2 of 5 (permalink) Old Feb 5th, 07, 08:04 AM
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Re: Building an LT-4 383 Stroker from an LT-1

I don't know what the LT means in the designations but are you just building a 383 from a crate motor ? The only thing I see first off is the newer blocks have the spider plate retainer bar that locks the GM roller lifter in position. This is an inexpensive way to start . All you have to do is get a cam to match your combo. As for piston, you need to determine what application you want to run, street , race , etc. As for heads, I think you need to stay between the 195 cc - 210 range, depending on your piston and application of this motor. I have the 195's on my mule 355 and they will be ported and put on a street 383. I do intend to run my current XR 282 retro roller as I don't have a late model block . I do believe you need to stay in the 10 scr or slightly under such as 9.9-9.5 range to run pump prem fuel. There is a bunch of stroker kits out there, you just have to make your mind up on which one. You prolly have visited AFR's site and get flow numbers off the LT 4 heads. I dont think they vary much from the 195 ported.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #3 of 5 (permalink) Old Feb 5th, 07, 08:49 AM
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Re: Building an LT-4 383 Stroker from an LT-1

Don - the LT1/LT4 is the designation given to the early to mid 90's 350 with alum heads and opti spark (crank trigger) ignition. Used in vettes and '93-'97 Camaros before the LS1 was introduced. The LT4 was used in Camaros in '97 and only a few handfulls were produced.

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post #4 of 5 (permalink) Old Feb 5th, 07, 09:19 AM
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Re: Building an LT-4 383 Stroker from an LT-1

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Originally Posted by DjD View Post
Don - the LT1/LT4 is the designation given to the early to mid 90's 350 with alum heads and opti spark (crank trigger) ignition. Used in vettes and '93-'97 Camaros before the LS1 was introduced. The LT4 was used in Camaros in '97 and only a few handfulls were produced.
Thanks Dennis, then I a wet here but I think I still am close when I mention the spider bar? To guide the roller lifters. Prolly pretty much L98 motor I guess.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #5 of 5 (permalink) Old Feb 5th, 07, 01:38 PM
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Re: Building an LT-4 383 Stroker from an LT-1

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Originally Posted by zdld17 View Post
Thanks Dennis, then I a wet here but I think I still am close when I mention the spider bar? To guide the roller lifters. Prolly pretty much L98 motor I guess.
the LT1 and LT4 engines were the final evolution of the "old school" small block. reverse cooling, front mounted distributor, cam driven water pump. the LT1 was used in 92-96 Corvettes, 93-97 f bodies, and 94-96 B bodies. the 94-96 Caprice also had a 4.3 liter version in 94-96 Caprices only. it had the bore of a 305 with a 3" stroke crankshaft and longer 5.94 con rods.
once you strip one down, they look a lot like any other 87 and newer small block, but with a different timing cover, water pump, and cylinder heads with different cooling passages.
the LT4 was the ultimate version of the LT family- it had bigger heads than the LT1, and a bigger roller cam with 1.6 roller rockers. it was the ONLY small block to ever come from GM in a car with roller rocker arms. i think it had 210cc intake ports stock, so they were pretty generously sized.

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