750 Carb too big??

[plundar]

I was wondering if this is true. I was told a jetted down 750 would work better then a 650 CFM on a 306, is this true? Thanks for the help.

 

[11sec87]

no

 

[MustangGT95]

I would run a 600 on a 306 unless heavily modded. My old 670 street avenger was alittle much for my mild 350 on my old Z.

 

[86bluecobra]

The question really is what rpm do you plan on taking the engine too? If you plan on running over 7000rpm closer to 8000rpm then the 750 is what you want if not however then a 650 will do plenty.

 

[plundar]

That is kind of what I thought. I'm a little pissed I bought the wrong size. I have a speed Demon 750 right now and that is what the shop talked me into. The car runs pretty good but I think it would run better with the 650. The 750 only has a couple hundred miles on it if anyone is interested. Thanks for the help guys.

 

[Maryland Stang]

The 650 would be much better.

6000 rpm times 302 cu in times .0003456 times .85 (typical VE) equals 532 CFM.