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As most of you know Im working on a 429 in a D1VE block. From what I can tell the piston is sitting in the hole .030. I was thinking about getting .027 Cometic head gaskets, but that still puts me at .057 right? I could have the block 0 decked, but it's already assembled and painted and I know if I take it to get it decked they are going to want to clean my $50 a quart paint off. So can I have the heads milled to fix some of this or will I not be able to mill them enough. They are C8's.

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Bob M
(Login Bob_M)
66.69.46.160 Milling the heads...
No score for this post January 8 2006, 11:48 AM

will bring the compression up, but will not restore the quench you are loosing by the deck clearance being too much. Depending on compression, you may have detonation issues. You are basiaclly turning your quench chambers into big open ones, as the cyl and gasket become part of the combustion chamber.

Just express your concerns about the paint, and your machinist should be able to be careful with it.

Bob M
http://fordifiedracing.com>
http://bigblockfox.com>


This message has been edited by Bob_M from IP address 66.69.46.160 on Jan 8, 2006 11:49 AM




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Sean
(Login thunderguns71)
206.74.81.102 Re: Quench Question
No score for this post January 9 2006, 10:54 PM

Well I'm having my machine shop zero deck my block. Do I need to worry about my valves hitting anything with a .549 lift? One more question while Im thinking about it, with a stock crank thats been polished, and stock rods with ARP bolts, I figure my stock C8 pistons would be the weakest spot in the bottom end, but just how much do I need to worry about them. I don't expect to use any NO2. What would be a safe rpm limit?

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Bob M
(Login Bob_M)
67.79.37.189 well...
No score for this post January 10 2006, 8:38 PM

You should be ok with the valve-piston clearance, if you have stock size valves.

The stock piston's skirts are known for cracking, but seen some stock bottom end's abused pretty good. You won't need to rev the torque monster past 5,500 anyway.

I had a stock CJ engine (cast pistons) in a 71 truck that had a piston knock for a good 3 or 4 years before it finally let loose of the rod and windowed the block. I abused it dayly.

Bob M
http://fordifiedracing.com
http://bigblockfox.com


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Sean
(Login thunderguns71)
206.74.81.102 Re: well...
No score for this post January 10 2006, 8:42 PM

The valves are stock sized. I don't see any cracks in the skirts, and the tops are not pitted any. The only problem now is the machine shop says my crank needs to be turned, instead of polished.
 
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