Quote:
Originally Posted by Jay S
Butler’s composite gaskets crush to around .042”. to .044” thick.
Blue felpro crush to about .045”, most cheaper head gaskets crush to .045” also.
I assume the cam is still using the comp 9-way timing set using full advance 4th key yet, as reported earlier. Could be just a miscommunication on my end. I will reiterate it though, the 4th key should be 8* advanced, each key changes the advance 2*. Using the extreme 4th key ends up at roughly 105.5* if it started at 113.5*.
Like Cliff said, quench is marginal to bad, if the cam is advanced too far, you'll wish you never touched the cam timing. If your convinced all is good though, carry on.
There is plenty of valve to piston clearance with the SPC-8 cam and 1.5 rockers. No reason to bother checking that. Should be good unless the installation is really messed up.
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After re-reading this post some, if this is correct and I am more advanced than I thought, I simply must go back to the beginning and pull the advance out completely using the factory settings of 113.5 and set the dial indicator and degree wheel up to verify that I am at 113.5 actual. Recent tests indicate that I am as hot as if I am running the AC. In addition, the newly remanufactured Heads must be adding to the raised Heat. JMO.
Since the Heads are installed, one can calculate the crushed gaskets that I bought from Butler Brothers with the metal ring inserts to find the new quench by using the newly found compression ratio stats that I have provided? A typical Head job takes off .010 " shaved to flatten the Heads, approx. Also, the 428 ci Pontiac motor is 10.75:1 CR, out of the box, so what is my CR today? Can these new facts I have provided be why This motor is hotter than it should be? I will say it again, I am in a new territory and need some help, this engine has become a new project with the Head changes and advanced Cam timing, especially if the timing Cam numbers are doubled compared to what I have been thinking, getting confused here. I am thinking that the CR has risen with this build and the Fuel could be too low in octane with these new changes I have made to this Engine?