How much to gain from porting upper and lower intake?

[88Stangboy]

My friend Kyle has a 91GT and he has basically the same set up as me,
ported heads, bigger valves, F cam, shorties, and a Typhoon manifold. He
was wondering how much hp would porting the upper and lower intake be
worth. I told him i definatly felt the difference after i did it but he wants numbers, so...about how much?

 

[1SLO306]

10-15 but i might be wrong

 

[88gt]

Look around here for "tmoss"...He has a website, not sure what it is..he will be able to help naswer some questions for you...


Found it... www.tmossporting.com

 

[srothfuss]

I was beaten to the TMOSS part, but I would like to add that there probably isn't too much to be gained (cost vs. performance)

 

[RacEoHolic330]

i did my stock intake myself a while ago and i noticed a little bit, but it was not worth all the time and effort.

 

[N8Miller]

ported stock heads? if so, its not worth doing the intake. the typhoon prolly flows more than the ported stock heads, so the time/money into that would be the best investment.

 

[88Stangboy]

These heads were PORTED, the runners were made larger, had bigger valves installed, 2.02 intake, 1.60 exhaust. These are 1968 302 heads i believe im not sure though, i think thats what he said. He's had alot of work done on them over the past year. He has a Typhoon intake, which is basically a cheap copy of and RPM intake, and these intakes are rough!!!! Go and run your finger over the asphalt on your street and you'll understand what i mean. And the runner mouths are definatly smaller than the runners on the heads, i would say by about a mm or two. I went ahead and told him to get it done. It can't hurt and your intake should always outflow your heads by a few cfm anyhow. But now im curious about how much hp/torque it should net.

 

[tmoss]

It's worth it alright - but results vary due to the rest of the combination being right or not. The increase in airflow when done RIGHT is about 50-60cfm - it's up to you to turn that into power.