Figure out CR?On 408ci
Figure out CR?On 408ci I got a LME 408ci for a customer of mine,IM trying to figure out CR, pistons are wiseco -8cc,.010 out of the hole,GM mls gasket with small chamber AFR 225's with 72cc chamber.
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Originally Posted by beardWS6
More and more we get into my 408 from LME right now, I`m not very happy!
I don't think this is a matter of having to be unhappy, all you have to do is to have your heads miilled and go to a Cometic .045 MLS gasket to better your quench.You can get whatever CR you want.
I'd rather have your dilemma than mine. I'm having Erik build a 408 for me and was supposed to be using Wiseco -8's. Well the guy that was doing a valve job on my heads tells me the combustion chambers are 69cc, so I tell him to mill the heads .022 to bring me down to 66cc which is 11.1/1 CR. I get the heads home and I cc them only to find 63cc which puts me at 11.4/1. Now I have to go to custom -10cc pistons to get the 11.1 CR I am looking for. Not a happy camper.
I'd rather have your dilemma than mine. I'm having Erik build a 408 for me and was supposed to be using Wiseco -8's. Well the guy that was doing a valve job on my heads tells me the combustion chambers are 69cc, so I tell him to mill the heads .022 to bring me down to 66cc which is 11.1/1 CR. I get the heads home and I cc them only to find 63cc which puts me at 11.4/1. Now I have to go to custom -10cc pistons to get the 11.1 CR I am looking for. Not a happy camper.
Last edited by bigdsz; Dec 20, 2006 at 09:42 PM.
Well seemes to me a little low of what were looking for.We want more like 11.5 and 12.0 CR.My customer bought the correct heads but big chamber 72cc instead of 66cc.Anybody interested in these heads they are for sale now thay brand new with the spring upgrade
I assume you have a good tuner, becuase 11.5/1, particularlly 12/1 in the summer in Texas is asking for trouble. I'm in Florida and that's why I want to go from 11.4/1 to about 11.1/1. I'm paranoid, this past August my friend nuked his engine and I think he was only 11.7 or 11.8/1