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Push Rods

Moderator: Mod Squad

awe1979
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Joined: Tue Apr 24, 2007 3:35 pm

Push Rods

Post #1 by awe1979 » Wed Dec 03, 2008 12:11 pm

If the block is O decked and the head is shaved a little would you need shorther push rods? Thinking of having that done on my build.

CNC-Dude
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Post #2 by CNC-Dude » Wed Dec 03, 2008 1:10 pm

Just depends on how much has to be decked off of the block to arrive at 0 deck, plus how much additionally is removed from the head! Those 2 numbers added together will determine if you are in the clear, or have exceeded a safe margin for trying to stay with the stock length. Also, dont assume that even in stock unmachined condition your stock length pushrods are going to provide the best length and geometry for the engine. Factory production tolerances sometimes have a generous +/- allowance that could put your setup at the low end of being acceptable, as far a rocker geometry goes. So anytime you do a lot of changing and cut a head or block more than just a simple clean-up cut, its always a good idea to double check your rocker geometry just to be safe....

awe1979
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Joined: Tue Apr 24, 2007 3:35 pm

Post #3 by awe1979 » Thu Dec 04, 2008 6:00 pm

Would the machine shop be able to tell me after the cuting is done if I need to get shorter ones?

CNC-Dude
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Post #4 by CNC-Dude » Thu Dec 04, 2008 6:08 pm

Yes, if they are cutting the head and block, they should be able to determine what your needs are....but if the combined cuts for both exceed about .040 or so, I would check the geomery with an adjustable pushrod just to be certain!

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