Have ported stock heads, valves unshrouded with a performer RPM intake. Was wondering if gasket matching the intake to the head would bring any more power or not enough to warrant doing it?
Anybody have any experience in that area?
Thanks.

I asked my engine builder and they told me for a street motor it is not worth it but for their $72,000 707c.i. it wasn't even a question just a must.

i would pass on the gasket matching the intake to heads..........not worth the time or effert.......there is really no gain in it......and if the intake dont sit like it should you would cause more problems with the air fuel mixture running into the head.....it is best to keep the intake runners on the smaller side of the entry way to the head.

i have done it to a few motors but didnt see no gain at the track. race my car one weekend and brought it home did some porting on the intake and slapped it on and went to the track next weekend and nothing but the same results e.t. and mph wise........granted there could have been some weather conditions that effected the work that was done......but there was still no gains........so i stopped doing intake matching and porting all together..........but when i do get an intake i take a good look at it and may just clean up some heavy casting flash and thats about it......

I would say it depends on how much there off!I did my 820 heads because they were off so far there was a step,so I did intake and heads. graemlins/waving.gif

On my world s/r heads the intake opening measured 1.90 or so and the intake manifold opening measured 1.95...I'm not sure if having the intake port .05 smaller hurt anything that much, but it sure couldn't have helped.

I thought that on my 063 heads that there was enough of a step so i did mine,dont know if it will help being its not running yet

Joe, If the match on you intake to head is a step to more open or step down you would not see much improvement. If you have smaller head port than intake, resulting in a brick wall for the flow than you should do the port matching.

Originally posted by pcs0snq:
Joe, If the match on you intake to head is a step to more open or step down you would not see much improvement. If you have smaller head port than intake, resulting in a brick wall for the flow than you should do the port matching. This is exactly the advice I was given a month ago when I did my 781's. I was told to leave the intake manifold alone if it would insure that they would be slightly smaller than the intake ports on the heads. You would need to open up those ports on the heads to be slightly larger than the ports on the intake manifold, therefore, eliminating a "step". graemlins/thumbsup.gif

Hey John, Just looked at your project web site... nice job. graemlins/thumbsup.gif

Depends on the intake, and the use of the car.

If the intake has short straight runners, and allyou care about is HP, then do it. On the other hand, if you're running a dual-pane setup on the street, leave a step (small intake to larger head port) at the bottom of the runners.

Originally posted by pcs0snq:
Hey John, Just looked at your project web site... nice job. graemlins/thumbsup.gif Thanks Paul, I appreciate that. I think it helps me and others to have descriptions and photos of what we do to these cars during restoration. I think folks can better answer my questions after a visit to the site and some visuals ;)