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bubba-21 06-16-2012 10:53 PM

366 chevrolet big block
I recently ran across a 366 with around 20k miles on it and it runs great. My question is, can I do a performance build on it? I've always wanted to build a performance engine out of a tall deck truck engine. I know its not cheaper, but I just wanna be different. I've also heard that the tall deck 427 truck engine makes for a lot better candidate on performance builds. Any light on this subject would be greatly appeciated.

327NUT 06-17-2012 01:38 AM

Both the 366 and 427 were built for low rpm high torque truck work....not performance engines. They both use very heavy 4 piston ring pistons and no one to my knowledge offers any kind of performance parts for them. You can do a search function on this website and find quite a bit of info reg. both engines......being different doesn't always equate to performance.

poncho62 06-17-2012 04:47 AM

The 427 has the potential (bore) for some HP, the 366 does not......If you can get it, save the crank's forged and will fit a 396 or 427 06-17-2012 07:14 AM

366= Forged steel 3.750" stroke crank. Good 3/8" bolt rods. 4-bolt main caps.. Save these parts.. Scrap the rest..

bubba-21 06-17-2012 09:10 AM

I bought a book on chevy rat engines that stated the 427 would be a good candidate because it can handle a .125" overbore and with some machine work will handle a long stroke, long rod combo. It did state the 366 wasn't gonna be a good block to start with for that application but I just wanted to make sure no one had experience in that area with it before I completely wrote it off and moved to the tall deck 427.

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