Roller Rockers?
Ive tested a 525fwhp, very small solid roller, ETP 225 heads, 5.7L and made a 15hp gain by switching from 5/16" .080 to 3/8" .080. But ET heads have longer heavier valvles that makes valvetrain control a little harder. On the same engine I also swapped from stock rockers to shaft mounts and lost a few HP, most likely because they were heavier and had a worse MOI.
What we really need is someone with a Spintron to do a pushrod test. If the engine is up and running already, doing the entire test would take a few minutes of added time.
Pushrod selection with our LS engines are fairly limited, just get the stiffest ones you can fit. Weight isnt a real factor.
Ive tested a 525fwhp, very small solid roller, ETP 225 heads, 5.7L and made a 15hp gain by switching from 5/16" .080 to 3/8" .080. But ET heads have longer heavier valvles that makes valvetrain control a little harder. On the same engine I also swapped from stock rockers to shaft mounts and lost a few HP, most likely because they were heavier and had a worse MOI.
What we really need is someone with a Spintron to do a pushrod test. If the engine is up and running already, doing the entire test would take a few minutes of added time.
Ive tested a 525fwhp, very small solid roller, ETP 225 heads, 5.7L and made a 15hp gain by switching from 5/16" .080 to 3/8" .080. But ET heads have longer heavier valvles that makes valvetrain control a little harder. On the same engine I also swapped from stock rockers to shaft mounts and lost a few HP, most likely because they were heavier and had a worse MOI.
What we really need is someone with a Spintron to do a pushrod test. If the engine is up and running already, doing the entire test would take a few minutes of added time.
Tomorrow we do the Dyno tune and I'll be posting numbers with the dyno sheet.
Ive got Comp LSR cam(LSL Lobes), Comp 5/16" .105 wall pushrods, stock rockers(just upgraded trunions), lightweight LS3 valves, 918s all at .060" from coilbind, .607/.621 lift, and I dont have any valvetrain issues.
Most all lobes on LS cams are too agressive for higher ratio rockers. Stock cams and the ASA and hot cam stuff are the exception.... You will make a lot more HP per dollar by just doing a cam swap and sticking with the 1.7 ratio...
Are numbers more important than having your valve train take a crap because the LS1/LS6 LS2 and LS3 valve trains are not made to run with rockers with such ratios. Save your money and do it right. Get the cam with the specs you want but hey do what you want advise is free not taking advise can get costly after a while. 
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Verdad Gallardo Whoa there, they are just questions. Who said it would ever go on my car? How do you know I'm not putting an argument to rest with one of my friends? In any event thank you for the advice. It will, indeed, be heeded. Though I'm still curious of gains. If the valvetrain were upgraded to compensate for the 1.85's.
if you have a cam spec'd out for 1.85 rockers, yes you will make more power with the 1.85's on that cam than you would with 1.7's. just switching to 1.85 rockers on a stock motor, you will be lucky to see 5hp.
