I am rebuliding a 460. it's torn down and ready to go to the machine shop. My buddy helping me with the rebuild says i wont be happy with anything LESS then 10:1. My machine shop tells me that that high a compression will take away from the trucks offroad performance and he recommends i go no higher then 8.9:1. What does the offroading community think?
Also, my machine shop is telling me I wont be able to run regular octain gas with a high compression engine.
Tell me what you know, and what you have done.
Thanks, Ivan

 

With a 460, 8.9:1 is great. You will have better power, and be able to run whatever you want in it for gas. Much more than 9.2:1 on that engine, and you will need premiuim. Go to 10:1+, and you will be on a first-name basis with the local race-gas supplier. Put an aftermarket aluminum intake on it, one of those Truck Avenger 670cfm 4BBL's would probably be great on it, and maybe open up the prots a little. Even on a stock rebuild, this will make tons of power.

Jared

 

I run 10.5:1 KB flat top pistons in mine a it runs fine on 92 octane.

Make gobs of torque with a 750cfm Carter on it.

My truck weighs 7200# and will still pull 94mph in the quarter.

 

go 8.1 then supercharge. you'll get reliability and milage

 

[updated:LAST EDITED ON 16-Dec-02 AT 00:25 AM (EST)]I have also never heard of higher-compression taking away any kind of performance whatsoever.

I think I would find a new machine shop.

It is true about the gas, I have 10.3:1 in my 460 and it definetly has to have premium.

 

you dont need that hig compression in a big block. That's what small blocks have to do to compete is run high compression.