Originally Posted by cobalt327
You want track proven? I've posted this so many times now that I'm sick of it but here goes. All steel '81 Camaro w/0.030" over 455 Pontiac, ported 6X, Performer intake, cam, TH400, 3.08 rear gears- 12.7 @ 107 mph. Carb was a Holley.
You have to be joking.
You guys have really fast cars. These are full weight normal driving vehicles? My mothers accord weighs about 3600lb with the 4 cylinder, It is a aluminum can. It is hard to get an old GM full size down to 3600. Almost inpractical.
Using the scale at the land fill. It weighs your car at its actual weight. No door sticker, or advertised weights.
When I did the drag only build with 4.56 gears it would be at the hydraulic limit around 6300-6500rpm. Taking it up before the traps it would run out, and had to let off. Made it to 13 flat using the Mopar direct connection book 13sec 440 reciepe. Mopar 509 cam 3600 stall 4.56 gear in a 3800lbs 70 barracuda. I thought that was a fast package. Using a demon 750 DP.
A 600cfm never made more than 300hp NA.
I built a 355/th350 with the rpm complete heads and cam and intake and 750 carb 3000stall 4.10 build. It supposedly made 420hp, according to the mph it was about 268 rwhp.
My truck is super charged vortec sbc and probably makes 350hp at the flywheel. If you can get 1hp per inch NA that is fantastic. My NA stuff was around .8 to .85hp per inch, figured from the mph.
To dial in the carb we use a 4-5 gas probe at the collector. You turn the car wheels resting on a rollers with 500lbs of resistance strapped down with a fan . O2 Co's Nox A/f in parts per millioin ppm and tune accrording.