Rockers
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
'Rated' means absolutely nothing. RPM peak will depend on cubic inches, head flow, intake manifold, exhaust manifolds, etc. You can take a cam 'rated' for 6800 RPM, throw it in a 408 stroker and power will peak and start falling by 5500 RPM.
If you're really worried, just get trunion upgrades for the stock rockers.
If you're really worried, just get trunion upgrades for the stock rockers.
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Brett Foote Sorry i got mixed up with my 5.3 builds im building. Its actually a howards turbo cam. The same cam in the 4.8 with twin 76s and stock bottom end that made over 1k.
I'm using Comp's Ultra Pro Mag rockers in my build. They're steel 1.8:1 ratio rockers, so they're stiffer than aluminum rockers but they're profiled to keep the weight only marginally more than aluminum. They won't fatigue like aluminum either, so you don't really have to worry about them breaking either. I bought mine for $345 from a sponsor.
12 Second Club
Joined: Sep 2005
Posts: 4,273
Likes: 0
From: Bucks County, Pa.
Some have even told me that the NOT trunnion upgraded stockers are just fine as well.
In my 185K factory LS1, it was the LIFTER'S rollers that lost their needle bearings due to hard use/high revs, NOT the rocker trunnions, they are STILL perfect!
In my 185K factory LS1, it was the LIFTER'S rollers that lost their needle bearings due to hard use/high revs, NOT the rocker trunnions, they are STILL perfect!
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Rockers From the CStraub rocker bushing upgrade thread:
http://cimg3.ibsrv.net/gimg/ls1tech....c6301f8bd1.jpg
https://ls1tech.com/forums/generatio...nion-kits.html
http://cimg3.ibsrv.net/gimg/ls1tech....c6301f8bd1.jpg
https://ls1tech.com/forums/generatio...nion-kits.html
Last edited by joecar; Apr 26, 2016 at 03:05 PM.
Google the pros of high ratio rockers and start reading. If you have to replace everything now I would probably opt for standard 1.7 ratio and get a matching cam. In my case, I already had a nice set of SLP 1.85's that a previous owner installed, so I bought a cam designed to work with them. The valve train is a system of components, get it all working together appropiately and you will have a good running motor that will last a long time.
Next question you need to ask yourself is how much time and work do you want spend setting the valve train up? Going to a Yella Terra or shaft mount will require shimming to get the right wipe pattern. Where stockers are pretty much bolt-on and go. Hence why most opt for these with upgraded trunions. Some roller rockers are heavier over the valve then stock, which needs extra measures taken for proper valve control...another reason why most opt for upgraded stockers.
Next question you need to ask yourself is how much time and work do you want spend setting the valve train up? Going to a Yella Terra or shaft mount will require shimming to get the right wipe pattern. Where stockers are pretty much bolt-on and go. Hence why most opt for these with upgraded trunions. Some roller rockers are heavier over the valve then stock, which needs extra measures taken for proper valve control...another reason why most opt for upgraded stockers.
