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That's an interesting comment. The car's pedal is connected to a spring on the carburator by a metal cable. I don't think there's much progession going on there. I'll have to look at that. I don't know what are the impact of low BSFC numbers on the engine? Eric

Indeed, AC is an available option. Heating is an option too :-) As I mentioned, this will be a weekend racer, not a full blown race car. As for the streets, the Ultima outhandles and outbrakes the Pantera, hopefully I'll be able to tame the beast when street driving. ;-) Since I'm building the...

The dyno numbers I posted are from an actual run of the motor on an engine dyno. Motor specs: 10.5 compression, CNC ported cyl. heads, Edelbrock 2950 manifold, Comp Cams CS258/264 roller cam, .020"/.022" valve lash, Holley 750 cfm carb, 1 7/8" diam. headers, Jesel rocker shaft, SCP 3 stage dry...

You are right. The accusump is not necessary, and I probably won't install it on the car. I only got the dyno chart for the second half of the rpm range right now, so I still can't tell how 1st gear is going to be like. The dyno chart shows from: RPM TORQUE HP BSFC OIL_TEMP...

here's a revised gear ratio charts. It think this one is much better. 1st - 3.00 2nd - 1.79 3rd - 1.29 4th - 0.97 5th - 0.76 Final - 3.44 The motor gets peak power 640hp @ 6500 rpm. The main cause of failure for this particular engine is oil starvation, which should be mitigated by using a dry...

About those ratios being a bit on the strange side. That's why I posted on this forum, to get some help adjusting them so they are correct for the car's intented use :) So how streetable would 1st gear be with 2.83 ratio? Eric

Thanks for the input guys! I'm gonna change 1st gear to 2.83. I should probably adjust 3rd gear too, the change from 2nd to 3rd is a bit too small. Probably 1.25. The goal is to be able to drive it on the street. It is a indeed 640 HP carburated, dry sump motor with an accusump to prevent oil...

I'm currently building a street-legal racing car with the following specs: Motor: SBC V8 - 640 hp - 6500 rpm redline Gearbox: Porsche G50/01 5 speed manual Tires: 18" (26" diameter) stree tires The car weight 2200 pounds. I'm wondering if these gear ratios are acceptable: 1st - 2.43 2nd -...