Quote:

I'm pretty sure the 392(6.4) evolved from the 6.1, not the 5.7.



5.7 is 3.92x3.58 B&S
6.1 is 4.06x3.58 B&S
6.4 (392) is 4.09x3.72 B&S

the 6.4 is a different block than the 6.1, as it has the different cam tunnel for the VVT cams and additional oil passages for MDS lifters like the 5.7

you CAN stroke a 5.7 to 392 CID with a .030" overbore and 4" stroke crank, FWIW....

besides the bore and stroke differences, the 6.4 has bigger valve and port heads, a different intake, and IIRC essentially factory short tube stainless steel headers, and a bigger cam than the 5.7

think of it like comparing a 318 to an E58 360....

Last edited by patrick; 11/06/12 06:04 PM.
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