[CHIEF8U]

I'm building a '81 Pontiac Grand Prix with a '68 RAM AIR IV. I'm looking to be streetable but by far not a daily driver.

Block; 400 .060 over (413)
Heads; #61's.. Flow 220+ @ .600
Cam??; 520's lift 310 +/- duration ????
Valve train; Roller lifters, 1.62 Roller rockers
Compression; 10.2:1 with flat tops ( +/- 75CC )
Intake; Weiand dual plane 7286
Carb ; Holey 780 dual feed
Exhaust Muffler; Headers, Dual pipes into Grand National transverse 2 in 2 out resonator
Rear Axle; 3.73:1
Torque Converter; 2800rpm ???

Any suggestions...?????
Big question; WHAT CAM, WHAT CARB, WHAT TORQUE CONVERTER
What HP should I expect... Sure would like to be in the 11's.. I'd like to spray it into the 10's with a plate

[CHIEF8U]

I'm building a '81 Pontiac Grand Prix with a '68 RAM AIR IV. I'm looking to be streetable but by far not a daily driver.

Block; 400 .060 over (413)
Heads; #61's.. Flow 220+ @ .600
Cam??; 520's lift 310 +/- duration ????
Valve train; Roller lifters, 1.62 Roller rockers
Compression; 10.2:1 with flat tops ( +/- 75CC )
Intake; Weiand dual plane 7286
Carb ; Holey 780 dual feed
Exhaust Muffler; Headers, Dual pipes into Grand National transverse 2 in 2 out resonator
Rear Axle; 3.73:1
Torque Converter; 2800rpm ???

Any suggestions...?????
Big question; WHAT CAM, WHAT CARB, WHAT TORQUE CONVERTER
What HP should I expect... Sure would like to be in the 11's.. I'd like to spray it into the 10's with a plate

[ponchobob]

Why are you calling it a RA-IV?-unless your heads are actually 1970"#614's. And s#itcan the weiand intake. Even a stock 68"-72"iron intake will make more power. There are GOOD reasons it did'nt stay in production long!-Bob.

[uneasyrider]

I don't know about that dual plane intake and I'm not sure I would go with roller lifters if you are talking hyd. If you are talking solid roller I don't think the combo is "hot" enough to need it. The problem with the hyd. rollers is that they are the same valving as "standard" hyd. lifters so they still have problems at around 6,000rpm plus. I would suggest a standard soild lifter if you want some R's out of it. If you go that way the least I would put on it is an E-RPM manifold and a singal plane would be better. If you are running it on the street I would spend extra cash and get a switch pitch torque converter. It will give you about 2,500rpm in "race" mode and stock stall in "street" mode. I don't like anything more than about 2,500 stall on the street PERSONALLY because it feels like you're driving a jet boat around with much more than that and the overall drivability sucks IMO.

[CHIEF8U]

I guess I should have said RAM AIR IV cloan. The heads I'm having done are #61's, I understand they have the same combustion chamber as the 614's. I am getting mild port work done on the heads. I think I'm going the get the studs changed to bolts but, will just girdles will be enough. Thanks for the insite on roller lifters, it was a thought but if they won't do me much good I could save that $500 bucks.

I have has a #9794234 manifold a Holey spread bore and #15 heads on the motor now. What cast intake would be the best for my set up? I think I should go with a dual plane to get more low end power or would an open chamber be a better compromise for the top end. I'm also thinking of going to a 780 or even a 800 carb

I'm looking for the right cam. The motor has a Melling 284 duration,436 lift with 68 degree overlap @ .05., it acts and sounds pretty mild. I'd like something that would realy give the motor some kick, sound good and cammy at idle and be streetable... The car has hydro boost brakes so idle vacuum would not be an issue

Thanks for the suggestion on the switchable torque converter. Who makes such an amimal and where's the best place to get it?