[slowbird]

10.25 isn't really low. Run the cam you have and enjoy. I would run a T2 intake with spacer though

[ponjohn]

310CFM AND 242/248 cam will get you there.

[64gp4spd]

Hi, I have a similar combination in a 64 GP with 5 speed TKX.
463 with Kauffman 310cfm heads 11to 1 compression, T2 intake with
1 inch spacer and Holley 950 HP. Running OF Cam on 112 LSA with 1.65
rockers. Absolutely love this combination.
Rich

[blueghoast]

I agree with slow bird and tom s,

GT

[Formulajones]

Originally Posted by grivera

Thanks - does the lower compression work better with the 110 LSA vs the 113 in my HR242 cam?

The 113 is just going to push the power band a little higher and spread the curve out. Not a bad thing. The bonus is smoother idle and more vacuum. Should run brakes fine.
My 242/248 was also on a 110 and it worked brakes marginally, I added an extra vacuum canister and drove it like that for nearly 25 years.
Dad's engine with the bigger 254/262 on a 110 didnt run brakes that well. He used a electric pump for a while but eventually switched over to hydroboost.

[Formulajones]

Another is the 455 I built for a member here. It is 9.98:1 compression and I used Paul's custom spec'd 239/243 @050 with a 112 LSA. It is also over 600 lift. That engine was built to appear stock. Stock aluminum intake q-jet RA manifolds etc....and made 507/571 on the dyno Paul uses with a really nice flat torque curve. That car drives like a stocker with a nice snug-ish converter and 3.42's and runs the power brakes and AC. A very nice well manored driver that should go into the 11's.

[ta man]

Originally Posted by grivera

That would be ideal - Is the OF designed with headers in mind? Also, what is your combo’s compression and what carb and spacer are you using?

My old combo was 10.25 to 1 for compression with a 950 Holley HP torker 2 and a one inch spacer

[OCMDGTO]

Run what you have Will!!

[grivera]

Is my Holley 850 Double Pumper 4781-5 up to the task?

[PunchT37]

Originally Posted by grivera

Is my Holley 850 Double Pumper 4781-5 up to the task?

All day.

[Lee]

I was running 11.5's with a 231/239 HFT and iron D-ports, street trim, over 20 years ago. That was with a Torker II, no spacer, and a 4779 750 DP Holley.

The bigger the intake duration, the more stall you'll need to get a decent launch. I would NOT use more intake duration than what the OF uses.

[Steve C.]

"I was running 11.5's with a 231/239 HFT and iron D-ports, street trim, over 20 years ago"

Pssssst... Lee don't dare tell what LSA it had. Don't upset the troops

[besserspat]

Originally Posted by Lee

I was running 11.5's with a 231/239 HFT and iron D-ports, street trim, over 20 years ago. That was with a Torker II, no spacer, and a 4779 750 DP Holley.

The bigger the intake duration, the more stall you'll need to get a decent launch. I would NOT use more intake duration than what the OF uses.

I know guys with 502 and 540 BBC with 700 lift HR cams running 11.5 s ....🤣

Peter

[Formulajones]

Yeah I can say that about any brand really. Most guys don't know how to tune, set up a car correctly, or even drive for that matter. There are plenty of pontiacs around here that don't run for chit too.

[grivera]

Originally Posted by Lee

The bigger the intake duration, the more stall you'll need to get a decent launch. I would NOT use more intake duration than what the OF uses.

Didn’t know this - thanks.

FJ- is this a factor with the 454 you mentioned?

[Formulajones]

Originally Posted by grivera

Didn’t know this - thanks.

FJ- is this a factor with the 454 you mentioned?

Nope, I ran a tight Continental P2 converter in it that would flash right at 32-3300 at the track with a nice little wheelie and go 1.59 60 foot times. Engine made peak torque at 4400 but didn't matter, even down where the converter flashed it was still enough torque to yank the tires. Converter drove really snug on the street too, one of the best I ever had in the car.

Certainly could have went quicker with more stall converter but there is this thing called compromise. I like nice street manors so I give up a little

[grivera]

Awesome- thanks

[grivera]

Originally Posted by 64gp4spd

Hi, I have a similar combination in a 64 GP with 5 speed TKX.
463 with Kauffman 310cfm heads 11to 1 compression, T2 intake with
1 inch spacer and Holley 950 HP. Running OF Cam on 112 LSA with 1.65
rockers. Absolutely love this combination.
Rich

Have you taken that beast to the track? What’s it run? How about power brakes/vacuum?

Is the Torker 2 port matched to the 310 heads? Any issues there?

[Dragncar]

You will be fine with what you have.
Brakes ? I am running a 265-274 112 cam in a 461 and it runs the brakes OK.

[Dragncar]

Originally Posted by besserspat

I know guys with 502 and 540 BBC with 700 lift HR cams running 11.5 s ....🤣

Peter

My engine has only been down the track 4 times and not made a full pass yet.
Testing. Making sure it stops and does not leak ect.
But the best pass was a 11.50 while getting off the gas just past the 1/8 mile mark.
Took off at 3000 RPM and went through the lights @ only 92 MPH.
Sad deal if you can,t get a 540 BBC below 11.50 !