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Old 12-24-2020, 02:47 PM
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Jim Moshier Jim Moshier is offline
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Join Date: Dec 1999
Location: Acton, CA
Posts: 307
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Quote:
Originally Posted by steve25 View Post
If your willing to dump at some point the 3.73 gears then I would build the 4.210" stroke motor since it will complement the port volume of the heads better, IF we are talking about Round port heads.

If these are D port aftermarket heads then even concidering the weight of your car I would go with the 440 build.
So, if Round ports use the 4.21 stroke crank for the compliment of the ports, As, I only have the round port aftermarket heads...SO,
I was thinking the longer stroke builds a ton of low-end torque and with the lighter 68 Firebird then say a Lemans, GTO, GP, the 4.00 crank may be easier to hook. what compression and cam would you use?

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Jim Moshier

1971 Grand Prix 462ci SD Performance 6x heads
1962 Catalina 389
1968 Firebird 400-455 I haven't decided

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