push rods in a FE
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Posting Guru
Joined: Jul 2003
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From: alaska
push rods in a FE
I have learned that there are four different lengths of push rods for 360/390 engines. what decides which length goes in a particular engine combination? Is there a measurement or is it trial and error? My reason for asking is because I have a 360 block with 390 crank and rods , 360 pistons, one 390 head and one 360 head I realize how that sounds but Im a hundred miles from any thing that resembles a machine shop and am trying to use whats available. This engine will never see more than 45 mph. Im putting it in a 75 tow truck that I use to help friends with here in Alaska
Cargo Master
Joined: Aug 2003
Posts: 3,237
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From: Belleville, Ontario
Considering the mix & match situation you are in, try test fitting one of each of the different lengths that you have at the same rocker to see which one fits best. Do the same on both sides in case one head was shaved at one point.
Thread Starter
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Posting Guru
Joined: Jul 2003
Posts: 1,280
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From: alaska
thanks for the reply, In another portion of this page I found a neat article on how to un- and pre-load puchrods and also how to measure for the correct length. it was called 'bent push rods, fords dirty secret. it seems , on digging thru my shop , i have representatives of all 3 lengths, now the fun starts, not being sarcastic , i actually enjoy this kind of thing, thanks again Bob
Cargo Master
Joined: Apr 2001
Posts: 2,697
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From: Vancouver
I learned that it is not absolutely critical that the "correct" length pushrod be used, as long as it is not too long. I had a 390 with a poor valve job that had resulted in many (maybe 16) different valve stem heights. I measured a few and used a standard pushrod. Worked great.
Eric
Eric
