intake manifolds

[luxeryvic]

i know that there are better heads than others for sbc's but are certain stock intake manifolds better than others?

[MrPbody]

Absolutely. There are far too many to make a complete "list" here.

General rules "of thumb": A non-EGR intake is better than most that ARE "EGR" (Exhaust Gas Recirculatioin, identified by a vacuum can and valve that "plumbs" exhaust gasses into the intake runners).

If you run a Q-Jet or other "spread bore" carb, always use a spread-bore intake, no adapters please. If using a Q-Jet, '68-'72 are the intakes of choice ('73 was the first year of EGR). The mid-'80s aluminum "spread bore" intakes aren't bad, but still have the EGR provision. Anything that "fits" fuel injection (TPI) will not accept a carb. TB (throttle body) intakes aren't much, either. "CrossFire" has been modified to make a ton of power, but be prepared for a LOT of work. Those are based on the late '60s "Smokey Ram".

The factory intakes from the mid '60s that are aluminum and mount a Holley or Carter AFB are superior in performance than any other single 4-bbl. intake factory-offered, provided the correct type carb is used.

If you have a specific casting in mind, let us know what it is and maybe we can dig up some info on it.

Jim

[comp]

whats your combo ??

[luxeryvic]

i plan on running a q-jet, i just have 2 manifolds and i want to know what one would be better to run on a 305 with a summit cam , i will post the casting numbers soon

[luxeryvic]

ok here are the numbers

one is 14007376

and the other is 346249

what one is better/ will result in more power?

[comp]

Originally Posted by luxeryvic

ok here are the numbers

one is 14007376

and the other is 346249

what one is better/ will result in more power?

both of those alum. ?

[luxeryvic]

no, they are both cast iron 4bbl Q-jet manifolds

[comp]

i'm not where my intakes are but you want alum.,, i'll find # later

[luxeryvic]

i dont want to buy another one, i just have 2 cast iron intakes and i want to know which one is better so i can use the better one can anyone tell me which one is better?

[comp]

Originally Posted by luxeryvic

i dont want to buy another one, i just have 2 cast iron intakes and i want to know which one is better so i can use the better one can anyone tell me which one is better?

maybe you can trade 2 for one

[comp]

remembered i have a alum. one here i started porting ,, # is 14014432

[luxeryvic]

what? u want to trade me your aluminum one for my 2 cast iron intakes?

might be kinda hard, im from ontario, canada

[luxeryvic]

what? u want to trade me your aluminum one for my 2 cast iron ones?

might be kinda hard, im from ontario, canada

[MrPbody]

Look at them. If one has EGR and the other doesn't, use the one that doesn't. If they're both with or without, choose the one in better condition. There won't be a significant performance difference, regardless.

Jim

[comp]

Originally Posted by luxeryvic

what? u want to trade me your aluminum one for my 2 cast iron ones?

might be kinda hard, im from ontario, canada

no i got rid of all the iron one's ,,for alum.