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#1
11-05-2015, 11:01 AM
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370
I want the smaller main journals and the shorter stroke.
A 389 is a 400 less 0.058" bore. When I was building engines it was always, "When in doubt, bore it out." The 370 can be bored to 4.121 and use a stock 400 piston. Use a 428 piston and lengthen the connecting rod. The bore/stroke ratio and the rod/stroke ratio get real attractive. Compression ratios from 7 to 1 all the way to 12 to one are attainable. The cost for the adapter and motor mounts are the only issue with the 370 being one of the best Pontiac motors. |
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#2
11-06-2015, 03:00 AM
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I agree on the attractiveness of a '58. And don't forget that it's a forged crank with straight-shot oiling of the rod journals.
__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) ... or has a Pontiac born the same year as Jim Wangers? (1926} 
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