I was running 10 lbs boost in my last set up, But, it was very poorly designed, the exhaust ran very close to the box around the carby making inlet temp very hot,not a good thing but it still lasted about 5000 k's before it went bang.I posted a pic of the piston in the photo section under forum.

The best head would be the one with the lowest compression ratio, the largest chamber.

The S u question Im not sure on. I have seen side draught webbers set up that way on a L20b with a super charger and they worked well

I havent tried a copper head gasket yet but I guess it wouldnt hurt, you could drop the compression the aswell with a thicker gasket.


With a blow through system as boost pressure incresses it tries to push the fuel out of the carby and back to the fuel pump because the whole carby which is inclosed in the box is now in a diffrent atmosphere so to speak.
Your fuel pressure has to be about 3-5 psi above boost pressure in theory, but in practise I found the standard mechanical pump would work up to 10 lbs and 5400 rpm then engine would die for a second then get up and go again and would keep doing that untill you got of the throttle.
Another trick that worked is to pull the mechanical pump appart and streach the spring, it will help.

But ultimately an electric fuel pump and r r reg is the go.I have seen normal regulators modified to become rising rate ones all you do is tap boost pressure into the back of the reg behind the diaphram, Ill try to get more imfo on this or a pic to make it easier to under stand