400blocks with boost
03-14-2003, 04:52 PM
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400blocks with boost
I recall Guido (maybe someone else) saying stock 400 blocks can take up to around 15psi before they crack. Is this correct and/or what is the "general" limit of these? TIA
03-14-2003, 08:14 PM
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Car: Old Car - 1982 Vette. New Car - 1972 Vette Convertible
Engine: Old Car - 1200hp TTSBC 427. New Car - TT LS7X
Transmission: Old Car - 4L80E. New Car - TBD
Boost alone is very rarely the cause of a cylinder block failure with the proper preparation, typically head gaskets will fail before anything else. Generally, detonation and/or excessive rpm is more detrimental.
03-15-2003, 07:37 AM
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Car: 2000 Trans Am
Engine: LS1
Transmission: T56
It is commonly accepted that the 400 block is not as strong as a 350 casting due to thinner cylinder walls. The machine shop I had my Dart block prepped at explained to me that the factory 400 blocks, even with splayed studded mains, can take up to around 650ft/lbs of torque and they start pulling the crank out the bottom.
Tory Hess of this board broke one in his Formula with a big Vortech on it. Split the cylinder wall open.
I didnt want to go through that, so I ditched it and bought a Dart block.
Tory Hess of this board broke one in his Formula with a big Vortech on it. Split the cylinder wall open.
I didnt want to go through that, so I ditched it and bought a Dart block.
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