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Old 10-22-2003, 08:32 PM
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how straight is straight enough (push rods)

i made a strightness checker for pushrods which works fine but i don't know whats acceptable. my daily delima is the ones that were in the motor are 1 peice harded type. the look straight but the dial indicator moves about 6 or 7 thousants on average on these. i have a new set with the ball ends, and they only make the indicator move 2 or 3 thousants. i would rather use the 1 peice ones but are they straight enough?

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Old 10-22-2003, 08:34 PM
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Roll them across a piece of glass. That will tell you if they are straight enough, Simple as that!
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Old 10-22-2003, 08:46 PM
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1 to 3 is okay. . .7 is to much. The latest trend is to go back to large diameter pushrods due to defection at high rpm and under heavy spring loads. I have had a customer change pushrods and gain 30HP. I would use a good .080" wall 5/16 if this is SBC or a 3/8" in a BBC. If it were a race engine 7/16".


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Old 10-23-2003, 12:54 AM
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thank you very much i will go with the new ones
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Old 10-23-2003, 08:05 AM
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30hp???

Are you sure? maybe they had the wrong ones in the first place?
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Old 10-23-2003, 08:32 AM
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Originally posted by minesblown
thank you very much i will go with the new ones
Cheap insurance. The best ones are still pretty cheap.
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Old 10-23-2003, 08:38 AM
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I've always done it like Poncho does.

Troy
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Old 10-23-2003, 10:50 AM
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Yes Im sure. . .you could tell on the dyno sheets with the variation in airflow that the pushrods were rebounding. This was a 42K BD2000 headed 417 dirt engine. Serious piece. 790HP at 6800 rpm. 30HP gain going from 5/16" to 7/16" single taper pushrods.

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Old 10-23-2003, 11:10 AM
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I could see that!
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