I had a Smith Bros. ball and cup 3/8 pushrod break in the middle, around RPM during a dyno pull, causing one of the loose parts to get caught between the lifter tie bar and block breaking the top of the solid roller lifter throwing it out of the lifter bore and bending the other pushrod next to it, luckily that block had lifter bushings in it so loss of oil pressure during that pull.They where made by Smith Bros., the company was here in Bend at the time so I had them custom make them for that motor. I took both pushrods, the one next to it was bent also, the valves in that cylinder where fine so it wasn't piston to valve cause carnage, the broken one had a visual flaw in the material where it bent and broke off. I had ordered and paid for 3/8x.120 wall 5/16 ball and cup drag race pushrods and when I took them back to them I was told they where .083 wall, not what I ordered and paid forBottom line they replace both of them but did not offer to help me on the broken lifters and loss of use for the dyno that day t due to their part failureThe cam lobe got damage by the other broken end of the pushrod when it fell into the lifter bore and cut into the cam lobeI had the cam fix and put the motor back together to finish the dyno testing, I had Manton make me a set of their series 3 3/8x.120 wall and took that motor to another engine dyno, DTS brand, in Klamath Falls, OR for the rest of the testing. I made several pulls on the dyno to warm the oil and motor up and then recheck the lash before making two all out pulls to RPM, the motor made peak HP RPM on the other engine dyno and made peak HP at RPM on the DTS dyno. We then change the pushrods and went back through warming it up and making several more pulls after checking the lash again, that motor made 8 more HP at RPM with the better Manton pushrods in itTheir is power in pushrods, get the best one you can get for your buildTerry Manton had told me before he died the same thing about pushrod clearances to the block, heads and guide plates as in their discussion on the attachment on pushrodsI have seen shiny spots from rubbing with no visual contact when checking them on the engine stand on more than one pushrod in my motors after racing them with no damages or failures, so far
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Mr.Cab Racing and winning with Mopars since . (Old F--t, Huh)
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