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What were the differences between the LS4 and the LS5 in 1970. I know the top dog was the LS6 but I can't find any info on these two 454 engines.
 

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wasnt the ls4 either a 400sb or a 396.
i dont think it was a 454 until about 73ish. but i could be wrong.


aaron
 

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The crank and rods were forged....not sure about the pistons. I always thought the only motors that got forged pistons were the SHP with solids and hi-compression.

wilma
 

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LS4 was the 345 HP 454 that came in fullsize Chevrolets in 1970...its the same as an LS5 but has the 325 HP/396 camshaft.

Per NHRA Stock rulebook, the cam lift for a '70 LS4 is .398" intake and .410" exhaust.

The '69 396/325hp shows .398" lift on both intake and exhaust.

Also, like Chris said, the LS4 was available only in full size Chevrolets (I have one in a Kingswood Estate wagon), and it only came with single exhaust.

Otherwise, they are identical including compression, carb, valve sizes, and all!

The pistons were cast in both the LS5 and LS4. Same dome, also.

So, throw on a set of headers and dual exhausts, and a small cam and valve springs, and go have lots of fun!:D




Randy
 
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