what is the best intake gasket to use to portmatch the heads and intake on a 1994 lt1??

 

The best answer is none. Do not gasket match the heads to the intake, or vice versa. Do a search on here for gasket matching and you will get better reasons for why, than I can explain.

 

why wouldnt you want to gasket match?

 

From what I understand after reading on these boards, the widest point of the intake runner on both the intake manifold and the cylinder head is at the mating surface for the 2. So opening up that point even more isn't really worth the effort. Besides if a person gets the intake manifold port at all bigger than the cylinder head port, it can cause turbulance and actually work against the proper air flow. If I remember correctly, I think I seen a thread once upon a time from Lloyd Elliott stating that the intake manifold port should actually be slightly smaller than the entrance point on the cylinder head.

On my AI 200cc heads and intake, the port shape of the intake runners, at the mating surface, on both the manifold and the cylinder head was probably the least machined part.

*DISCLAIMER* I am not a cylinder head Porter nor do I pretend to be one. The above information is what I have recalled from previous reading and may not be 100% correct. The OP can call LE, AI, GTP, or Lingenfelter and probably get a more accurate answer.

 

I took some pictures of a intake to head shot and the heads that I had , had smaller ports than the intake

the head port was visible smaller, looking down the intake port

 

Interesting.........! I am not sure on how to respond to that. Lol

I guess it just goes to show that everything you read may not be correct. So, with the above pics, does a person home port the cylinder heads, or ??? Also, would LE or AI touch a set of heads that have been home ported?

P.S. see above disclaimer....lol

 

im no porting wiz but it looks like a gasket match and cleaning up around the guides would help a bunch by itself..

if your heads have been milled that could throw it off more...

i would actually do the gasket matching and checking on the block you were going to use after the machine work was done to the block..

 

http://s886.photobucket.com/albums/a...5.jpg&newest=1

These heads are being port matched to the intake and gaskets. We are not increasing the size of the ports at the mating surface, simply matching the ports for optimal/smooth flow!!!! Don't know there you got the idea that the ports are larger at the mating surfaces??

 

Reread my posts above including my disclaimer.

Now, are you trying to say that the opening on the cylinder head to intake mating surface is actually smaller than where the valve guides or even the valve seats are? Also I have never personally measured (yet, I will when I get home) the difference on the intake manifold runners top to bottom, but It looked to me as if the runners were slightly smaller towards the top (plenum side).

Oh, and Dart Pro 215's are hardly stock LT1 heads

 

This is the way it was explained to me.

IMO, port matching the top, bottom and NON pushrod pinch side would be fine. If you match the pushrod pinch side, more air is having to go around the pinch (less of a straight shot through) which is the bottleneck in the first place. When this happens, it gets more turbulant and flow can be negatively impacted.

Now if you can open up the pinch without breaching, again the bottleneck, you will see bigger flows. Bottom line is you want to keep the straight shot through as much as possible. Look at a LS1 head and you will see the beauty of its design in this respect.