I have an olds 425 (not the toronado motor) that i bought for a swap. It ran good when i bought it on the stand but it wasn't getting oil to the rockers so i looked a little deeper. The pushrods were not clogged or anything but the oil was not going through the lifters. I soaked them in gas for over a week and tried to force fluid through them but for whatever reason they just were not flowing almost at all. None of them. So i bought Howard's Cams hydraulic lifters 91411 and they worked fine. Oil was now getting to the top perfectly. But the original pushrods were too short now with the new lifters for whatever reason. So i bought a set of 9.600" pushrods and the engine ran great with them but there was still a little bit of slop between the pushrod and the rocker arm cup and if was clattering as a result of coarse. I used my dial indicator to get a measurement of how much slop there was and it was reading about 50 thousandths. So i bought another set of pushrods at 9.650" and installed them. I crank the engine and right away i can tell by the sound there is no strain on the starter as if there was no compression. It ran fine only a few weeks ago with the other pushrods but now Its not starting and i checked for spark and fuel everything is good. So i checked for compression in 4 cylinders... Absolutely ZERO. I can't understand how 50 thousandths longer pushrods are holding the valves that far open that there is no compression at all. Do i have to let the engine run longer with the shorter pushrods so the hydraulic lifter will prime and close up the gap or something? Or is it really a matter of getting a set of pushrods custom made somewhere in between 0 and 50 thousandths longer?
Pushrod length??
- Thread starter Mattyp77
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Trend makes custom length pushrods, I have a few sets for BBC but I would think converting to an adjustable valve train would a better option.
I personally would go with a full roller set up. http://www.mondellotwister.com/RockersPushrods.htm
I personally would go with a full roller set up. http://www.mondellotwister.com/RockersPushrods.htm
I think i will do that. The non adjustable rockers are a pain in the *ss. I was just holding off because I'm trying to stay with an extremely low budget but those kits are actually pretty cheap. Thanks
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