Summit pro LS cam pushrod length?
Thread Starter
Joined: Dec 2009
Posts: 2,331
Likes: 29
From: Glennville, GA.
Summit pro LS cam pushrod length? I just rebuilt a gen4 5.3 for my son's truck. We used the Summit Racing™ Pro LS Vortec Truck Swap Camshafts SUM-8728R1. Used there recommended .600 lift springs. Etc. Did a full dod delete everything needed etc. got down to measuring pushrod length and the crazy thing is im getting 7.400 length no preload with a checker.
We installed some 7.450 to try and it runs fine but is a lil noisy because from what we measured and preload etc comes out at .050" I normally run my ls7 lifters at .080-.100" But what's crazy to me is I've never had to go to a length like this. We have normally ran .7400 or 7.425 or shorter if milled heads etc.
This truck is totally stock with felpro gaskets and 243 heads. How come such a long pushrod length? With correct preload says we need 7.500 but I can't believe tht with this setup. Not the norm for me. Thoughts?
We installed some 7.450 to try and it runs fine but is a lil noisy because from what we measured and preload etc comes out at .050" I normally run my ls7 lifters at .080-.100" But what's crazy to me is I've never had to go to a length like this. We have normally ran .7400 or 7.425 or shorter if milled heads etc.
This truck is totally stock with felpro gaskets and 243 heads. How come such a long pushrod length? With correct preload says we need 7.500 but I can't believe tht with this setup. Not the norm for me. Thoughts?
Thread Starter
Joined: Dec 2009
Posts: 2,331
Likes: 29
From: Glennville, GA.
I agree but this measurement is not normal in LS stuff I have built. How come such a longer pushrod length needed? Smaller base circle cam?
Last edited by brandon6.0; May 6, 2026 at 06:30 PM.
Thread Starter
Joined: Dec 2009
Posts: 2,331
Likes: 29
From: Glennville, GA.
Well finally got a new mic to check length with. I come up with 7.300" measuring the checker. Add .100" equals 7.400"
For some reason my checker isn't reading a true .50" with each turn out. I have always measured using a mic but my old mic had broke so I used the each turn =.050" method this go around.but apparently thts not accurate. At least with this checker.
Makes since to why it's reading long.
For some reason my checker isn't reading a true .50" with each turn out. I have always measured using a mic but my old mic had broke so I used the each turn =.050" method this go around.but apparently thts not accurate. At least with this checker.
Makes since to why it's reading long.
