355sbc propane questions

[5.7yjuggy]

I have a 355 sbc with Top proline heads 235cc runners 2.05/1.60valves 64cc combustion chamber,
Isky cam with .548/.555 lift .292/.296duration with 1.65 roller rockers (that I already have) puts it at .600/.610lift, with an overlap of 82*.

My question is would 13:1 compression with this setup be to high ?

 

[5.7yjuggy]

And yes I realize that this cam is much more suited for higher rpms, I'm sure someone will point this out

 

[REVELATION]

From my expierence propane loves compression, I ran a 355 sbc on it and it loved it. Now I'm running a 406sbc with 11.5-1 compression with a 525 cam with no problem.

 

[Elliott]

You're going to need as much compression as you can get because those heads are going to kill your bottom end with that size runner.But 13:1 will work good with the propane.But are you going to put a dual kit on it so you can turn that kind of rpm that those heads and cam are going to need to turn?

 

[altfuel1991]

You can run 13:1 compression with propane as long as you have a good cooling system. I am assuming that ratio is the static compression
and not the dynamic which is normally a little lower since it takes in to account when the valves actually close. And you will need a dual mixer setup
to take advantage of the horsepower and rpm that engine is going to see.

Let me know if I can help. Conversion systems are what we do.

Buddy Gamel
Precision Sales & Service, Inc.
451 64th Place South
Birmingham, Ala. 35212

877-403-7827
205-591-2267, fax

[email protected]
[email protected]
www.alternatefuel.com
www.workhorseservice.com

 

[5.7yjuggy]

This was my debate with running the cam and heads. I guess 13:1 it is and a dual kit.. As soon as its back from the machine shop ill worry about ordering the mixers