Small chambered race heads & dished pistons runnin

[67RS502]

I'm gonna be building a 400SB, and a friend will be building a 434, and both
of us will be using some kind of a exotic small chamber heads, and need to
have below 11:1 comp. for pump gas. He will be building a serious 434, with
anything 15deg. to little chiefs (not after he sees what it will cost). I plan on
using Pro Action 14deg (as cast small runner) on my mild street 400.
So the problem is with chambers around 50-55cc, can we make it work with
a 6"rod and a dished piston? I havent really looked into the chamber/piston/rod
combos and geometry/dimensions on all this, but would like to hear if someone
has done something similar and what parts may work.
My next question is Some of the builders / head manufacturers say that even
with a dished piston and below 11:1 comp. their small chambered heads will
still detonate, because they were designed to work with lots of comp. Why
wouldnt a well designed small chamber with below 11:1 not work on pump gas?
These are the 2 problems, getting the comp. down to pump gas levels and makin
the motors actually run on pump gas...

[Mike Stark]

If you get the compression down you will not have detonation problems with the small chambers. They do require less timing though. Be aware of that when tuning. Other than that the dish and small chamber will work great together.

[Guest]

Would a "reverse dome" help reduce the likelyhood of detonation? I'm thinking the extra quench area would help create more turbulence.
With the wrist pin location being so high, you may be limited as to how deep you could make the reverse dome.
Ken

[Mike Stark]

90% of all dished pistons today are actually a reverse dome. It does help with quench and turbulance. This helps to suspend the fuel and burn it more efficiently.

[hsutton]

A fellow here was trying to run a lot of nitrous with a SB-2 head and kept on burning up pistons. It ran pretty good but was unable to get more than two or three runs before the piston thing came up again. He had the timing all the way back to 5 degrees total and still the problem persisted. It may have something to do with the experimental fuel injection system also though. He even had a man who designed some of the upscale Bosch fuel injection systems work on the thing and still couldn't find the problem.

[Mike Stark]

We run an SB2 nitrous motor over here with no issues. 50 passes with no hurt parts. Makes 1400 + with the hose too. I would think it was related to his EFI more than timing.