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By BamaBob - 3 Years Ago
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Hi All, I am looking at purchasing new push rods for a 312 y-block with G heads and 1.54 rockers and a near standard 1957 cam. What would be the correct length pushrods for this set-up? I can't seem to find this info anywhere. Any help will be appreciated! Thanks.
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By paul2748 - 3 Years Ago
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I think Mummert's site has info on pushrod length. One thing to look out for is the size of the cup part - some are too small for the rocker and are prone to breaking because the stress is on the side of the cup instead of the bottom.
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By DryLakesRacer - 3 Years Ago
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If you have one any length and can cut it and thread it inside or outside making it adjustable you can send it to Smith Push Rods in Oregon to replicate. Easier with the intake off. I’ve never done it for a YBlock but countless other engines. I’ve raised and lowered rocker arm stands and also used lash caps to get proper geometry. Takes a little time but worth it to me. Smith was a 2 day turnaround the last time I used them. I’ve also used Manton. Good luck. It’s to bad we don’t have the many lengths available like a certain other engine.
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By 55blacktie - 3 Years Ago
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Mummert/ford-y-block.com says that pushrod length for G heads should be 8.125" long. "Richard" (see Classified) has take-off Mummert pushrods for G heads/w approximately 1500 miles. He wants $25 + shipping.
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By DANIEL TINDER - 3 Years Ago
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Seems like a pre-made adjustable pushrod for the Y-Block was once available (?). Likely the kind of item that would get loaned/rented & passed around. Shouldn’t the people that manufacture custom made rods have one? I would think a super-heavy deposit might guarantee it’s return, and thus facilitate future business.
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By charliemccraney - 3 Years Ago
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There hasn't been one available.
Most ball and cup adjustable pushrods are 5/16" ball and cup. You can get away with using one of those if you account for that difference in the measurement.
You can make one out of a tubular pushrod. You may or may not be able to do it with the tools you have at home. You need to cut one close to the top, thread the cut end of each section, install threaded rod in one end with loctite, no loctite on the other so the halves can be threaded together by hand.
You can measure the pushrod with standard tools that someone in the hobby has along with a 5/16" bearing. Set a combination square to about half the length of the pushrod, measure that with a caliper. Then hold the pushrod on the combination square, with the bearing in the cup and measure from the end of the rule of the combination square to the end of the pushrod. Add those together and subtract 5/16" and that is the length you need. Pushrods don't require as high a degree of accuracy as other parts of the engine.so this method, while a little clunky, works fine. A few thousandths of error won't matter here, like it would with pistons, for example.
If you want to make measuring a little easier, get a 12" caliper. You can find quality used ones pretty cheap. Vernier tend to be cheaper but you need your glasses, good light and a degree of skill to read them accurately. Dial and digital are much easier to read but tend to be more expensive. I prefer dial over digital because there is no battery to die.
I got a used Starrett 12" vernier caliper a couple years ago for under $100, for this purpose.
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