engine choice?

[Marlin Bogner]

I sent NHRA ,Div. 5 and diamond piston original pistons.They refused until Bob Lang and Wesley chimed in . the pistons have nhra logo 67-71 318 and # 800078 laser engraved on them, and 4 valve reliefs.

[James L Miller]

Originally Posted by Marlin Bogner

I sent NHRA ,Div. 5 and diamond piston original pistons.They refused until Bob Lang and Wesley chimed in . the pistons have nhra logo 67-71 318 and # 800078 laser engraved on them, and 4 valve reliefs.

Pat Cvengros called me today and told me the new Diamond 318 piston, #80077, was a "True flat top" and "no valve notches" according to Pat. Not sure what happened, but that is disappointing.

I believe I originally brought up the roll bar issue since I was reluctant to put one in my 340 Barracuda. I guess it could always be cut out.

[Sam Capizzi Jr]

Originally Posted by James L Miller

Pat Cvengros called me today and told me the new Diamond 318 piston, #80077, was a "True flat top" and "no valve notches" according to Pat. Not sure what happened, but that is disappointing.

I believe I originally brought up the roll bar issue since I was reluctant to put one in my 340 Barracuda. I guess it could always be cut out.

Interesting. So with all this talk about aftermarket heads and intakes on the mopars I decided to give this thread a new look. So what your saying is that it was approved, built and now it's no longer approved?? I do know that when I asked a few questions to pat about different year 318 intakes, i was told that they (68-71 and 73) are two different motors with different parts which is why they have different horsepower numbers. This was when all 318s were at 185 and the 69 was at 182.

[Coleydog]

Originally Posted by Sam Capizzi Jr

Interesting. So with all this talk about aftermarket heads and intakes on the mopars I decided to give this thread a new look. So what your saying is that it was approved, built and now it's no longer approved?? I do know that when I asked a few questions to pat about different year 318 intakes, i was told that they (68-71 and 73) are two different motors with different parts which is why they have different horsepower numbers. This was when all 318s were at 185 and the 69 was at 182.

What rear, gear ratio are you running? Converter?

[Dave Noll]

Originally Posted by Billy Nees

Check out the Featured Flyer in last weeks Dragster!

Nice, somewhat vague, article. Nice car.

[Sam Capizzi Jr]

Totally missed this thread. Idk where to start but I will say that the flat top piston on the 318 (which is the only legal one as far as I know) is one of the limiting factors...I've reached the point where the only improvements on my car will come in the form of cubic dollars spent....also there is a single plane intake legal for the earlier year 318s that should be faster BUT the engine isn't making any horsepower over 6300 anyway so who knows.

[James L Miller]

Originally Posted by Sam Capizzi Jr

Totally missed this thread. Idk where to start but I will say that the flat top piston on the 318 (which is the only legal one as far as I know) is one of the limiting factors...I've reached the point where the only improvements on my car will come in the form of cubic dollars spent....also there is a single plane intake legal for the earlier year 318s that should be faster BUT the engine isn't making any horsepower over 6300 anyway so who knows.

Pat told me the new Diamond piston (80077) is also a flat top. Not sure why two Diamond flat top pistons are needed. I e-mailed Diamond but they haven't responded to my inquiry.

Sam, are you running the "high top" BBD 1-1/4" on your 318? Somewhere around 1973/4 they switched to the "high top" air horn casting but also switched to AFB jets which would be nice. The change was for emissions to seal around the accelerator pump better and pipe it off to the canister.

[Sam Capizzi Jr]

Originally Posted by James L Miller

Pat told me the new Diamond piston (80077) is also a flat top. Not sure why two Diamond flat top pistons are needed. I e-mailed Diamond but they haven't responded to my inquiry.

Sam, are you running the "high top" BBD 1-1/4" on your 318? Somewhere around 1973/4 they switched to the "high top" air horn casting but also switched to AFB jets which would be nice. The change was for emissions to seal around the accelerator pump better and pipe it off to the canister.

I'm running the earlier vacuum version. I had to get creative and make a set of jets for mine. Haven't tried the later version