Originally Posted by 454C10
if you plan to drive it a good amount on the street then take it easy with the lift, as high lift reduces valve train life quickly. Is it worth a few more hp for a shorten valve spring life?
I would use the RPM intake. You need torque with 29 inch tall slicks and only a 4.11 gear. I would think you are working with a 3.73 gear when considering the height of the slicks. I'm thinking 130mph at 6500 rpm with that setup. What trap speed are you planing to run?
I would use the Dart 200cc heads since you already have them and the 12-771-8 242/248 280/286 110 .570/.576 (2500-6500) Comp cam. I would also do a little DIY bowl smoothing on the dart 200cc heads (especially on the intake side).
if MPG is any concern, use a vacuum secondary carb.
what weight is your car?
the heads have already had a good amount of "cleaning up" done to them, they were flow tested before and after and the after got about a 6% average flow gain from .300-.600" and a overall max gain of 11% at .600. MPG is of no concern for me this is just fun driver car, with some strip time. the car weighs around 3600lbs.
the current set up on the motor has a solid flat tappet cam with .525 lift and has been dyno'd at just under 500tq. (494)
as far as trap speed goes, she currently runs 11.60's @ 116mph and i'm running through the traps at around 5500rpm. and i'm running around 2900rpm at 60mph with the p295/65R15 drag radials on there. i really kinda of like the gears where they are and i wouldn't consider going higher in gear i would think about a set of 4.33's but not as low as 4.56's
i dont expect to see too much more out of this set up, the current set got me 512hp/494tq, if i can get 525hp/505tq with the new cam i would be happy. on thing i have to keep in mind is that i have a 3500 10" stall (really 3500-3800) and i am not replacing that stall as it cost 700.00. so the 2500-**** cams in this motor will really act more like a 21-2200-**** and only need around a 2800 or 3000 stall, the 3000-7000 cam will act more like a 2600-6600 cam and would still do fine with a 3500 stall.
i think i am leaning toward the 248/254 286/292 .576/.582 110 3000-7000 cam as after you take into account the 35 extra cube the 385 has over the 350 is will act more like a 2600-6600. the cam that i have in there now is a 3200-6400 and it acts more like a 2800-6000 cam.