Ford 302 SS build

[ShipC1970]

Happy Sunday all!

Doing a ton of homework and planing for my super stock 1970 mustang. I have a question in reguards to heads. I am a little confused because It shows that the AFR1399 heads are accepted replacements in the technical bulletins however not in the NHRA accepted replacements. Also in the rulebook it’s a little unclear as to if they are ok to use for super stock. Anyone have experience with this? I do have the matching D00E heads and block for the car and a roller 302 that I could use for GT class. Any help is appreciated.

Thanks!
Chris

[Mark Ugrich]

Chris , The 1399 head is legal in superstock.They must meet published combustion chamber , intake and exhaust runner volumes
along with stock size valves for your engine.

[Rory McNeil]

Originally Posted by ShipC1970

Happy Sunday all!

Doing a ton of homework and planing for my super stock 1970 mustang. I have a question in reguards to heads. I am a little confused because It shows that the AFR1399 heads are accepted replacements in the technical bulletins however not in the NHRA accepted replacements. Also in the rulebook it’s a little unclear as to if they are ok to use for super stock. Anyone have experience with this? I do have the matching D00E heads and block for the car and a roller 302 that I could use for GT class. Any help is appreciated.

Thanks!
Chris

Am I correct in assuming that your engine choice, for a 1970 Mustang, is the 302 2 barrel? Just seems to be a rather odd choice.

[ShipC1970]

Originally Posted by Rory McNeil

Am I correct in assuming that your engine choice, for a 1970 Mustang, is the 302 2 barrel? Just seems to be a rather odd choice.

Yea I have some 302 blocks laying around the garage that I could use. Problem is I’m on the fence about it because of that reason. Considering going 428 route because of it.

[Doug Hoven]

IMO the 70 2bbl 302 is rated a bit too high. Unfortunately to my knowledge there is only 1 year with a 4bbl 302 in which an automatic was offered, 1968. The 83-85 5.0 4bbl is stick only, and all of the 70s 2bbl 302s that are in the 130-140hp range would be impossible to even make GT/QA weight. There's a few racers running the 68 4bbl 302 in super stock. It's a good combo, but with aluminum heads it's even better.

[ShipC1970]

Originally Posted by Doug Hoven

IMO the 70 2bbl 302 is rated a bit too high. Unfortunately to my knowledge there is only 1 year with a 4bbl 302 in which an automatic was offered, 1968. The 83-85 5.0 4bbl is stick only, and all of the 70s 2bbl 302s that are in the 130-140hp range would be impossible to even make GT/QA weight. There's a few racers running the 68 4bbl 302 in super stock. It's a good combo, but with aluminum heads it's even better.

Hmm ok thanks for the info! Would I be able to run a 390 in the GT class? Or no because the 390 wasn’t an option for the 70 mustang?

[Dwight Southerland]

390 in SS/GT is very legal. Classification depends on selection of the 390 engine you have in mind.

[Jim Caughlin]

Originally Posted by ShipC1970

Happy Sunday all!

Doing a ton of homework and planing for my super stock 1970 mustang. I have a question in reguards to heads. I am a little confused because It shows that the AFR1399 heads are accepted replacements in the technical bulletins however not in the NHRA accepted replacements. Also in the rulebook it’s a little unclear as to if they are ok to use for super stock. Anyone have experience with this? I do have the matching D00E heads and block for the car and a roller 302 that I could use for GT class. Any help is appreciated.

Thanks!
Chris

If you plan to run the AFR head in SS, get your checkbook out, the heads as delivered have too large of valves. You need to remove all of the seats and weld up the head so you can install the smaller seats to match the smaller valves, then report them to match, not a small or inexpensive undertaking.

[Mark Ugrich]

Originally Posted by Jim Caughlin

If you plan to run the AFR head in SS, get your checkbook out, the heads as delivered have too large of valves. You need to remove all of the seats and weld up the head so you can install the smaller seats to match the smaller valves, then report them to match, not a small or inexpensive undertaking.

You can contact AFR and check if they will supply a “ porters casting” I think they rough in the ports and install the valve guides , possibly install the seats but i’m not sure.They did offer a head with the correct seats for the 289 combination, but that stopped a few years ago.

[fordteacherguy]

Originally Posted by Jim Caughlin

If you plan to run the AFR head in SS, get your checkbook out, the heads as delivered have too large of valves. You need to remove all of the seats and weld up the head so you can install the smaller seats to match the smaller valves, then report them to match, not a small or inexpensive undertaking.

The 68 302 iron head HP dropped to 207 hp and could be a great combo. 23 HP less than aluminum!