Originally Posted By: SteveSRT8
Originally Posted By: Mach1Owner
The engine was designed for 30 for daily use but even many ford engineers recommend using 40 is track cars. Even in the DOHC 4.6 which has tighter clearances.
I have seen nothing that indicates any of the factory clearances are reduced in the DOHC engine. Please explain, I am truly interested in this statement...
Aluminum blocks generally have tighter cold main bearing clearances. The general spec is .00098-.0019, though many aftermarket "race" style main bearings for the AL block bump this into the low .002x range with no I'll effects.
Originally Posted By: Mach1Owner
The engine was designed for 30 for daily use but even many ford engineers recommend using 40 is track cars. Even in the DOHC 4.6 which has tighter clearances.
I have seen nothing that indicates any of the factory clearances are reduced in the DOHC engine. Please explain, I am truly interested in this statement...
Aluminum blocks generally have tighter cold main bearing clearances. The general spec is .00098-.0019, though many aftermarket "race" style main bearings for the AL block bump this into the low .002x range with no I'll effects.