1972 Mustang CJ pure

[IanM]

The car is the 266HP with and auto therefore factored at 328HP.
I'm wondering if this is now over rated and therefore not going to be competitve. If other class racer are converting from 72' to 71' or running
this an HO, maybe I need more information before I continue?

[Bill Harris]

Since McClister has it going a second under, it surely is competitive! I would think the issue with going to the 275HP from your 266 would be finding the heads. They are probably pretty rare, especially ones that haven't been messed with making them illegal for stock (ported).

It appears the 71 280hp engine is identical to the 72 266, and they both have the 328hp NHRA factor.

It looks to me like the best 351C combo might be the '71 285/305 which is the high compression 4V. Same heads as the Boss 351 but with an unusually small cam. That is probably the reason the HP is so low for it.

If you want to run your car as a '71 and not have to deal with the hard to find and expensive 351C stuff, put a 429 in it. I have everything you would need if your interested. There is a lot of potential in that combo and only Vic Guilmino has really tried to tap it.

[Hans Olsson]

Originally Posted by Bill Harris

Since McClister has it going a second under, it surely is competitive! I would think the issue with going to the 275HP from your 266 would be finding the heads. They are probably pretty rare, especially ones that haven't been messed with making them illegal for stock (ported).

It appears the 71 280hp engine is identical to the 72 266, and they both have the 328hp NHRA factor.

It looks to me like the best 351C combo might be the '71 285/305 which is the high compression 4V. Same heads as the Boss 351 but with an unusually small cam. That is probably the reason the HP is so low for it.

If you want to run your car as a '71 and not have to deal with the hard to find and expensive 351C stuff, put a 429 in it. I have everything you would need if your interested. There is a lot of potential in that combo and only Vic Guilmino has really tried to tap it.

Heads from a 266 or 280 (D1ZE-DA) are legal to use on a 275 hp.

[IanM]

Thanks for the information. I didn't know that the Holley and alum intake were legal for pure stock.
If there is anything else you can add it would be greatly appreciated.
IanM

[Dave Turner]

Also, be mindful of the carb & intake restriction in Pure Stock. You will need to be happy with the Autolite carb and cast iron intake. A Stocker benefits from the optional Holley/aluminum intake swap.

Good luck Ian!!

[X-TECH MAN]

Originally Posted by Dave Turner

Also, be mindful of the carb & intake restriction in Pure Stock. You will need to be happy with the Autolite carb and cast iron intake. A Stocker benefits from the optional Holley/aluminum intake swap.

Good luck Ian!!

The Holley and alum intake that is legal on the stockers is legal in pure stock also.

[Dave Turner]

Originally Posted by X-TECH MAN

The Holley and alum intake that is legal on the stockers is legal in pure stock also.

I did not know that....thanks Terry!!

[X-TECH MAN]

Originally Posted by Dave Turner

I did not know that....thanks Terry!!

Your Welcome.....Its been legal since they were allowed many years ago in the 70's. Robert Imbody from Ohio won several pure stock races back in the mid 70's while using them. They origially came on the Pantera. I think NHRA allowed the parts back in around 73-74 era and IHRA went along with them.

[Hans Olsson]

Originally Posted by X-TECH MAN

The Holley and alum intake that is legal on the stockers is legal in pure stock also.

What years in NHRA stock are they legal for? All 4V clevelands?

[X-TECH MAN]

Originally Posted by hans olsson

what years in nhra stock are they legal for? All 4v clevelands?

71-72