Pushrod length checker help
Pushrod length checker help Comp cam 7702 6.8-7.8 for LS engines.
Ive just finished slapping my prc 225 heads on with ls9 gaskets and Johnson 2116 lifters. Upon looking through my mound of old specialty car crap from my head swap years ago I seem to have lost my old pushrod checker! I ordered a new one off Amazon. I think I may have received a knock off, it has no knurling or comp cam stamping which I’m sure my last one did have..I’m not sure how precise I truly have to be with these lifters and I’ve done a few checks just piddling around, but now I’m rather hesitant on even trusting what appears to be a knock off tool. If someone can be so kind to tell me what their comp cam tool mics out at when fully closed and say 10 turns open I can kind of guesstimate how trustworthy I can be of this tool…checked 2 valves on cyl 1&3. One valve fell within a 7.650 spec with preload. The other was about 16 1/8 turn from zero lash or approx 7.606. Being so close I mic’d it. I came out to around 7.610ish. Measuring gauge length vs overall length is only a difference of 4 thou? Wtf. Is this right?
Ive just finished slapping my prc 225 heads on with ls9 gaskets and Johnson 2116 lifters. Upon looking through my mound of old specialty car crap from my head swap years ago I seem to have lost my old pushrod checker! I ordered a new one off Amazon. I think I may have received a knock off, it has no knurling or comp cam stamping which I’m sure my last one did have..I’m not sure how precise I truly have to be with these lifters and I’ve done a few checks just piddling around, but now I’m rather hesitant on even trusting what appears to be a knock off tool. If someone can be so kind to tell me what their comp cam tool mics out at when fully closed and say 10 turns open I can kind of guesstimate how trustworthy I can be of this tool…checked 2 valves on cyl 1&3. One valve fell within a 7.650 spec with preload. The other was about 16 1/8 turn from zero lash or approx 7.606. Being so close I mic’d it. I came out to around 7.610ish. Measuring gauge length vs overall length is only a difference of 4 thou? Wtf. Is this right?
Last edited by mstansbury0704; Oct 3, 2023 at 05:44 PM.
You can't trust it even then, lol. I just went thru this, setting checker to match a btr pushrod exactly OAL and testing both in engine. checker had .060 preload while the actual pushrod had .100
So I order pushrods from manton with that correction factor, and the ones that showed up are still .015 off from that.
So I order pushrods from manton with that correction factor, and the ones that showed up are still .015 off from that.
You can't trust it even then, lol. I just went thru this, setting checker to match a btr pushrod exactly OAL and testing both in engine. checker had .060 preload while the actual pushrod had .100
So I order pushrods from manton with that correction factor, and the ones that showed up are still .015 off from that.
So I order pushrods from manton with that correction factor, and the ones that showed up are still .015 off from that.
I used checker springs and a dial to measure the valve drop. I havent done anything yet, but Ill probably cut up one of the manton pushrods to make my own checker. that way the end tips won't vary from the actual ones and cause another mis measurement
I appreciate the info but man that’s a real kick in the ***** to know the checker won’t work. Lol
This is the checker I used.
https://www.summitracing.com/parts/sdm-pce4011005
I’d expect all checkers to vary a tiny bit because of the tip profiles, but not .040
My best recommendation would be to measure, then order one to compare to.
https://www.summitracing.com/parts/sdm-pce4011005
I’d expect all checkers to vary a tiny bit because of the tip profiles, but not .040
My best recommendation would be to measure, then order one to compare to.
This is the checker I used.
https://www.summitracing.com/parts/sdm-pce4011005
I’d expect all checkers to vary a tiny bit because of the tip profiles, but not .040
My best recommendation would be to measure, then order one to compare to.
https://www.summitracing.com/parts/sdm-pce4011005
I’d expect all checkers to vary a tiny bit because of the tip profiles, but not .040
My best recommendation would be to measure, then order one to compare to.
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So just out of curiosity I measured one of my used 7.5 pushrods against my checker set to 14 turns out(7.500”)
these are the measurements I got on my 8” caliper end to end
Pushrod checker at 14 turns= 7.5015-7.5020”
Compcam 7957 7.500” pushrod = 7.5060-7.5065”…mind you these are used 30k mile rods that do exhibit the ball ends wore through the black coating they put on them but it’s all I have.
so gauge length appears is only about .004-.005” shorter. Seems like it doesn’t even matter. Going to just mic out my checker for the valves and be done
these are the measurements I got on my 8” caliper end to end
Pushrod checker at 14 turns= 7.5015-7.5020”
Compcam 7957 7.500” pushrod = 7.5060-7.5065”…mind you these are used 30k mile rods that do exhibit the ball ends wore through the black coating they put on them but it’s all I have.
so gauge length appears is only about .004-.005” shorter. Seems like it doesn’t even matter. Going to just mic out my checker for the valves and be done
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