RJ,

The 70 and 71 high compression 340's have a 2.02 intake valve. The 72 and 73 low compression 340's have a 1.88 intake valve. I am assuming heads with the 2.02 valve can flow substantially more air than the 1.88 with S/S style porting.

Charlie Walc ran one of the high compression 340's in S/S years ago. He said it was a fun car, but an expensive one.

Hi Stewart, I'm not sure if the 67 383 AFB has the weights in the rear or not. I have flowed the one without the weights and it was 565 cfm. The AVS is 635 and the 70 Holley is 645. These are clean stock carbs I had laying around, The numbers are rounded to the nearest 5. If the intake will be custom made the Stage V head which is similar to the 346 and 452 would be the best bet. If you use a store bought mani the 906 head can be an advantage. I would stay away from the 67. Paul.

Greg, for some reason NHRA says the 2.020" intake head requires the same intake port volume as the 1.880" valved heads, so I don't know there is much there once you sink the valve/fill in the floor. The piston is the only other difference, and I can get a piston weight at or below what the low compression 340's currently run.

Hey Paulie,
Sam Dillow is looking to contact you. Send me a message with a number he can reach you at.
Gmirza1236@aol.com

RJ, you may be right. The port volume may be restrictive enough that the bigger valve makes no difference. I understand that the area closest to the valve is the most important, and as you move back upstream, it has less effect. I certainly have no first-hand experience doing any port work. Perhaps Paulie, who has been posting on this thread, might have some ideas.

RJ, do you run a late model GTO? If so, how fast is it, and what modifications have you made to it?

I am not a mopar guy at all ... but it seems that wayne taylor , ken etter, Bob mazzolini have had pretty fast cars with the 318. i have no clue what year or car that combo is from .

Greg, e-mail me - carolinaperf@yahoo.com

The '70 Holley on the Road Runner/Super Bee engine (335hp) flows considerably more than 645 cfm. The primaries are 1.562" (same as a 600 cfm carb) and the secondaries are 1.750" (same as an 850 cfm carb). I had one on my flow bench recently and it was well over 700 cfm.

Stewart, you may want to contact Jim Fitzpatrick in Orlando.He does a fair amount of heads ..all Mopar I think.He seems to be very knowledgeable and alwaya willing to help.