Rules Verification for a Newbie

[Tony Corley]

As I've posted in other places on here, I recently purchased an older built GT/PA car that I'm just starting to go through and verify what I have. As far as carburetors are concerned, am I correct that as long as it is the same brand (Autolite 4100 in this case), and has the correct venturi and throttle plate sizes called for, manufacturer date code doesn't matter? In this case, my engine is a 1964 based 289, but the current carb is a C6 PF (1966 289 carb). Has the correct size centuries and throttle plates as the '64 should have. I know to some of you that have been doing this a long time, these questions probably seem silly. I would never consider cheating, but I would hate to show up at a race and be disqualified because I didn't fully understand the assignment. So thanks in advance for answering the dumb questions.

[Alan Roehrich]

What you need to do is contact the tech department in Glendora. That's the ONLY opinion that counts. You "probably" have a carburetor you can use. Just get it in writing.

[Tony Corley]

Originally Posted by Alan Roehrich

What you need to do is contact the tech department in Glendora. That's the ONLY opinion that counts. You "probably" have a carburetor you can use. Just get it in writing.

Then that's what I'll do. Thanks

[GTX JOHN]

The part # and codes on the carburetor have not
been a concern for many years now.

The specs on the other hand certainly still are
the concern.

[Tony Corley]

Originally Posted by GTX JOHN

The part # and codes on the carburetor have not
been a concern for many years now.

The specs on the other hand certainly still are
the concern.

This is what I thought, because the rulebook specifically states:"Replacement carburetors permitted provided they are
same model, type, throttle bore, and venturi size. "

[Jim Caughlin]

What combo are you running? As a general statement, the Ford combo is the 1.08 carb and the Merc combo is the 1.12. More to it than that but that should at least get you started on figuring out what you need.

Jim Caughlin
SS6019

[Tony Corley]

Originally Posted by Jim Caughlin

What combo are you running? As a general statement, the Ford combo is the 1.08 carb and the Merc combo is the 1.12. More to it than that but that should at least get you started on figuring out what you need.

Jim Caughlin
SS6019

It's currently set up as the Ford combo with a 1.08 Autolite. Just not the date code, part number listed for the '64. The carb I have is listed for the '66, with the same specs that the '64 calls for. I also have another carb that needs to be built that is listed for the '64 combo, but it's listed as a manual carb (my car is an auto) As far as I can tell, there is no difference in the venturi size or throttle blade size from the 2 carbs I have compared to the one the combo lists. Everywhere else in the rulebook (heads, pistons, rods, crank, etc, it)specifies NHRA Listed replacement. The carb is the only rule that states that a replacement is allowed as long as it is the same type, venturi size, throttle blade size, etc, which makes me think it's ok. I was just curious if anyone else had already dealt with this that could shed some light. I can do as suggested above, and contact Glendora.

[Jim Caughlin]

Just make sure you have the correct bores on venturi and throttle blade. The date code, etc isn't an issue, just make sure you have the correct casting with the 1.08 or 1.12 ID on the bowl. For the most part the 1.12 Merc combos have been pretty beat up, most all of the cars you will find are running the 1.08 Ford combo in either SS or GT classes. People are also running the '68 Merc 302 with the Holley carb. It seems like the most preferable combo at the moment is the '64 Ford 1.08 carb combo.

Jim

[Tony Corley]

Originally Posted by Jim Caughlin

Just make sure you have the correct bores on venturi and throttle blade. The date code, etc isn't an issue, just make sure you have the correct casting with the 1.08 or 1.12 ID on the bowl. For the most part the 1.12 Merc combos have been pretty beat up, most all of the cars you will find are running the 1.08 Ford combo in either SS or GT classes. People are also running the '68 Merc 302 with the Holley carb. It seems like the most preferable combo at the moment is the '64 Ford 1.08 carb combo.

Jim

Since this is a "get my feet wet in Super Stock" type of deal,and an older build, I'm just going to run it in it's current form. I'm just trying to go through it and make certain everything is still legal. I'll have the engine apart in the next few weeks. Then I'll be able to verify everything internally is still legal. As long as it is ( or can be made legal under current rules without spending thousands of dollars), then I want to give SS a shot. Otherwise, I'm just going to bracket race it. Ether way, we'll have a lot of fun.

[Tony Corley]

Sorry Double post