Re: Ford 302 SS build
 

Which carb comes on that combo?

Re: Ford 302 SS build
 

Depends on whether you call it a Ford or a Mercury 302. If run as a ford, it gets the 450cfm version of the motorcraft 4300 spread bore, air valve secondary carb. If called a Mercury, you are allowed to run a 600cfm 4150 holley.

Re: Ford 302 SS build
 

Why is that and how is that? So I have the original 70 block and matching heads. So hypothetically even though it’s from a ford mustang and I run it in my mustang in GT/QA or PA and say it’s a “mercury” engine I could run a 4150? Who checks this by the way? Forgive me for all the questions I’m new!

Re: Ford 302 SS build
 

You can run GT only if the comb is a hybrid. If the combo can legally be run in SS, you can't run GT. In my case, I am building a '64 Comet with the 289/210 combo. If I run the large Autolite Merc combo, it is a SS/MA. If I run the small Autolite Ford combo, it is a GT/QA. You can't swap between classes, the argument for this rule was that people were running GT with legal SS combos to avoid a potentially losing heads up runs.

Re: Ford 302 SS build
 

No worries, it's confusing to everyone. In "GT" you are allowed to run any engine combination from the "family." For example a 283 in a 4th gen F body, or a pontiac/olds/buick 455 in a camaro. To run a 68 302, you could use your block, but you'd have to find a set of heads for the 68 4bbl engine. Whether it's true or not, the paperwork exists that a Mercury 302 in 1968 was available with a Holley, whereas the Ford cars had the 4300 autolite. So, long story short, to answer your question, yes. You could run a 1968 4bbl 302 with a 4150 in your 1970 mustang in GT/QA or GT/PA.

Re: Ford 302 SS build
 

So I have a 89 roller 302 in the garage. If I run that block with a set of 68 302 heads I could run it in GT because it would be a hybrid? And I could claim it as the merc 68 302/220 combo with the 4150?

Re: Ford 302 SS build
 

Yes, you could use the piston that fits the 68 302 combo ( 4 valve reliefs), the 68 4V heads ( C80E-F) or the aluminum replacement head, which is the better head, and more cost effective. And as a Mercury that combo takes the Holley 600cfm 4150 carb.
The 390, 428, 351c, even 351w are good combos to research also. I dont think the 2bbl 302 is good for Super Stock, Matt Hawk has played with the 302 2bbl and the carb is just too small for the hp rating.

Re: Ford 302 SS build
 

Mixing engine components does not make a hybrid. Using an engine by the same manufacturer that was not offered in your make-body is a hybrid.

Re: Ford 302 SS build
 

Gotcha so if I run a 390 combo I could run in GT since the 390 wasn’t offered in the 70 mustang? What about a 68 302 then? I couldn’t run it in GT since the 302 was offered in the 70 mustang?

Re: Ford 302 SS build
 

Different year engine combo can run in GT.