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Joined: Jul 2014
Posts: 53
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jul 2014
Posts: 53 |
Hello all,
I have been reading past posts with interest relating to the length of push rods.
I have been getting together parts for a while to replace the head on my 23 roadster with a 28 head. i have had a 28 head crack tested and skimmed, and have ground in the valves and replaced springs.
I'm intending to do the work over the winter, but a bit bothered that I might need to replace push rods, or even adapt them.
Any advice welcome
Steve
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Joined: Oct 2014
Posts: 49
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Oct 2014
Posts: 49 |
I'm restoring a 1923 with a 1926 block and a 1928 head. I haven't gotten this far yet, but an individual with the screen name "dpenniman" found a solution for his 1927 engine with a 1928 head. Here is his post:
"Thanks to all who offered help on my question about pushrod length for a 28 head on a 27 block. Here is how I finally solved the issue.
I made an adjustable pushrod gauge from some threaded rod and a small bit of pipe that the rods (two pieces with locking nuts) could slide in. With this adjustable device I could shorten or lengthen the gauge til I had what seemed to be the best fit. My result: required length - about 10 5/8 or 1/4 inch longer than a 27 rod (which is 10 3/8).
I cut the ends off of some 28 pushrods, rounded the ends (but did not harden the cut end) and placed this cut end in the cups (top end). Got advice to place hardened ends in the tappets. Not sure how well these will hold up, but we'll see...
Thanks again. Great to have some experts just a blog away.
Dave"
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Joined: Aug 2006
Posts: 324
Backyard Mechanic
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Backyard Mechanic
Joined: Aug 2006
Posts: 324 |
One option is to have them made to the exact length required. Custom Pushrods
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Joined: Apr 2010
Posts: 1,284
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Apr 2010
Posts: 1,284 |
I cut down some 28's about 35 years back as I was running a slightly longer valve with modern collets and caps in my 1928 Chev.
Had no problem for all that time. Went back to standard length when I changed heads and used original valves.
Cheers
Some say "Street is neat". I prefer "1928 is great" I have documented my 45 years with a 1928 Chev Tourer, from 1973 to 2018, and regulary add other items that I hope are of interest to others. Your comments are most welcome.The story of the Red Chev can be viewed at http://my28chev.blogspot.com/
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Joined: Jul 2014
Posts: 53
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jul 2014
Posts: 53 |
Thanks for this.
I hadn't appreciated that there were different push rod lengths for different years.
I guess my best bet then is to purchase some 28 push rods and cut down- or have some custom made as suggested.
What I really wanted to confirm is that the 23 push rods won't work.
Thanks for the responses- saved me some head scratching!
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