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Old 11-16-2012, 06:22 PM
David 377 David 377 is offline
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Supercharger 6-71 vs. 8-71

I have a Dart SHP block, Dart Iron Eagle heads, SBC 3.75 stroke, 4" bore, Comp cam .640 lift, 255 I - 262 E, 2.08 I - 1.6 E valves Mech solid rollor lift cam, 8.2-1 comp, Scat forged rotating assembly, This motor should handle a fair amount of boost.
For carbeuration I will run 2 650 cfm Quickfuel boost referenced carbs. I am ordering a blower from Supercharger USA and can't make up my mind between a 6 or 8-71, The car will use E85 fuel, which can handle about 11 - 12 lbs of boost. altitude is 2500 ft. On the 6-71 stage 3 billet, teflon I would need to overdrive 10 yet a 8-71 stage 1 or 2 (No teflon strips) billet it would be about a 1 - 1.
My concerns and reason for this post is to find out 1. Torque difference (if any?) 2. Temp drop with E85 and 1-1 ratio vs 10 overdrive. At 3600 RPM it would be 360 less rev w/ the 8-71 - At 7000 9Max RPM) it would be 700 RPM. I was told this difference should have little effect on the performance.
Is it better to not run teflon strips on the street? This car will go to the track and car shows. Mostly a wild toad street ride
1963 nova caged 18" tire 4.88 gear th350 3300 stall
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