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Hi Everyone, going to build a motor to put in a car and do some X275 and OLS racing. Going with a SBF 9.5" deck height with C3 heads. I have a choice of either a bryant billet 3.5" stroke crank or a Lunati pro series 4.0" stroke crank. I want to know will the F1R or F1X procharger will work better with smaller C.I. and rpm (375 C.I.). Or big cube and lower rpm (430 + cubes)?
 

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Efficency of the cylinder heads you are using will determine wether or not more cubic inches will be of benefit. Cant speak for Ford stuff but with 23 degree chevy stuff 400 ci is usually all the cylinder heads can support efficiently.
 

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427- 4.125x4. C-16? 10 to 1 compression 8k on the top chip, pulley according to what you need across the stripe. R is good everyone knows the X is the ticket.. Rear gear to be determined.... 10 to 1 compression can be done.timing will depend on head chamber and cam. This IMO.
 
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