details please? just what does it mean? i am prepping to switch to my 2 bbl set up next weekend. i figure i better have some idea what i'm doing.


mostly i'm concerned with the manifold to head gasket.


if i understand it correctly, i want to open up the portal on the receiving end of the flow to the size of the gasket hole. is that rite?

hence, flare the header inlets to the size of the gasket holes, and similarly flare the head portals on the intake ports to gasket size?

or is it an adjustment of the gasket to match the metal sufaces?

D~~~!

Yes, you got it right. That seems to work best on daily drivers for improved torque.

I just did the swapping of intakes over Christmas. My car was recently rebuilt and the head was already bowl ported/street port and the intake was gasket matched. The exhaust was ported too, but not gasket matched. I did open it up some but not all the way. So my head was already the way I wanted it per Doc's recommendations for mileage and torque.

While I had the manifolds apart I cleaned up the exhaust manifold as far as I could and gasket matched it. Same for the bottom from 2" to 2.25" to match the exhaust pipe.
The original cast iron intake I had gasket matched during the engine build, on the new aluminum manifold I left it stock this time.

The difference seems to be much better torque and better mileage.
I didn't think the exhaust porting and not porting the intake manifold and switching to the aluminum intake would make that much difference, but during the cold weather it brought back the mileage to almost what I was getting last summer.

Racers will open up both sides for max flow.

Hope that helps.

I am sure there are folks with many other modifications, but if this is a weekend swap, you can do these mods and get it all back together.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

You don't need to open up the port to the full size of the gasket.

You just need to smooth things out and match the ports.

A small step (smaller to larger) doesn't hurt anything. However, if you have a step down (larger to smaller) that DOES hurt things.

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes