porting intake manifold

[99BlackW68]

i plan on having my intake manifold ported by a local company, but I dont know how large i should tell them to port it out. i have stock heads...suggestions?

[bottlefedv6]

Re: porting intake manifold

uh, to match your heads and gaskets....bigger just means your heads are not going to match up and therefore ruin flow

[99BlackW68]

Re: porting intake manifold

so...if i have stock heads then i shouldnt get them ported at all? cause shouldn't they mate up right from the factory?

[Bird_Of_Prey]

Re: porting intake manifold

Gasket match. They don't match from the factory and you want to remove any casting flash and open them up a bit. Gasket matching will open them up about 1/8-1/4 all the way around. There will be clearly defined carbon build up to guide whomever. Do not polish the runners to a completely smooth surface inside. It will decrease flow.

[zpwn06]

Re: porting intake manifold

Gasket match. They don't match from the factory and you want to remove any casting flash and open them up a bit. Gasket matching will open them up about 1/8-1/4 all the way around. There will be clearly defined carbon build up to guide whomever. Do not polish the runners to a completely smooth surface inside. It will decrease flow.

I agree. the manifold is tuned to create "standing waves" or something that ups the pressure. So unless you have a degree in fluid dynamics don't mess with the runners. And also the smooth ones have less turbulence, and turbulence at that point helps it mix with the gas.

[99BlackW68]

Re: porting intake manifold

thank you much!

[zpwn06]

Re: porting intake manifold

did you ever get your s/c fixed?