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Old 06-16-2012, 10:53 PM
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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.

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Old 06-17-2012, 01:38 AM
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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.
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Old 06-17-2012, 04:47 AM
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The 427 has the potential (bore) for some HP, the 366 does not......If you can get it, save the crank though....it's forged and will fit a 396 or 427
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Old 06-17-2012, 07:14 AM
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366= Forged steel 3.750" stroke crank. Good 3/8" bolt rods. 4-bolt main caps.. Save these parts.. Scrap the rest..
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Old 06-17-2012, 09:10 AM
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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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