Just a quick couple questions for the more advanced AMC gurus...
For the 258 + 4.0 head swap, I am curious what the product displacement and compression ratio will be.
I know I have come across this info before, but cant seem to find it. A link, a formula, anything will help.
I have the #7120 4.0 head.
My stock 258 is 8.3:1 CR.
These answers to these questions will supplement some supercharging calculations.
Trying to decide if the head swap could potentially hurt a supercharging application. If the 4.0 head raises the compression ratio substantially, this could decrease detonation limited power. I wont be going after super high boost, I have pretty stock equipment, so I want to keep boost between 5-8psi.
I plan on using an aftercooler as well as water injection, and would like to be able to use pump gas, so I want to keep effective compression ratio relatively low.
Thanks
What I have read is the combustion chambers on a 258 is 62cc and the 4.0l 57cc.
Sweet, that helps. That means I can probably get away with a thicker head gasket
This calculator claims that 58cc is the most common size combustion chamber for a 4.0l
http://www.jeepstrokers.com/calculator/
good link, thanks