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Generation IV Internal Engine
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Old 04-16-2010, 08:59 AM   #1
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Default LS7 Solid roller cam ?

who makes them? a friend of mine got an LX with LS7 his fastest E.T is 9.51 the LS7 got hydraulic cam cant remember the specs only the LSA is 113 and now we want to go with solid roller cam with nasty numbers,his set up is LS7 with over bored pistons and 2 valve relifes,stock LS7 heads only been milled and GMPP intake manifold and 950 carb,TH350 and 5000stall,stock 8.8 with spool and 3.73 on 26" tires and the car has race weight and we might port the heads to full race port what solid roller cam do you suggest? the car runs on C14 and might change to E85 if Necessary BTW the car is N/A
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Old 04-16-2010, 09:17 AM   #2
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the factory ls7 heads generally don't hold up to the high spring pressures needed for a solid roller cam.My first suggestion would be to buy some aftermarket heads that will accept a much bigger spring
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Old 04-16-2010, 10:34 AM   #3
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Quote:
Originally Posted by Shawn @ VA Speed View Post
the factory ls7 heads generally don't hold up to the high spring pressures needed for a solid roller cam.My first suggestion would be to buy some aftermarket heads that will accept a much bigger spring
This=Truth.

It is a crapshoot at best.
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Old 04-16-2010, 12:34 PM   #4
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Don't hold up? How? Little more explaining please. Studs for the rockers and I do not see much problem...
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Old 04-16-2010, 01:39 PM   #5
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I am guessing the spring seats.
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Old 04-16-2010, 03:02 PM   #6
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I've heard is something like the material around and under the spring cup is too thin. Don't hold me to it though
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Old 04-16-2010, 03:14 PM   #7
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the castings are really thin at the spring seat,also incredibly thin at the rocker pedestal.Seen more than my share break in these 2 areas.
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Old 04-16-2010, 07:00 PM   #8
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Quote:
Originally Posted by 99LS6SS View Post
I've heard is something like the material around and under the spring cup is too thin. Don't hold me to it though
Quote:
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the castings are really thin at the spring seat,also incredibly thin at the rocker pedestal.Seen more than my share break in these 2 areas.
Well that's going to suck for me... Hope it does not fail on me.
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Old 04-16-2010, 08:48 PM   #9
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It's not that it won't woke it's that it's not reliable. By the time you cut the spring seat big enough you start getting extremely thin above the intake port entrance. It helps if you use a longer valve so you don't have to cut as deep to get the correct install height. It even has to be done on some aftermarket castings as well.
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Old 04-17-2010, 02:28 AM   #10
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Are the new as cast lsx heads any better in that respect?
Or are ALLPro's required? Or maybe the Mast/ETP LS7 stuff?
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Old 04-17-2010, 04:09 AM   #11
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I have some new street high rpm roller springs that will work with light valves and the right lobes but you would need good adjustable rockers.
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Old 04-17-2010, 04:13 AM   #12
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Quote:
Originally Posted by ringram View Post
Are the new as cast lsx heads any better in that respect?
Or are ALLPro's required? Or maybe the Mast/ETP LS7 stuff?
The aftermarket heads like those can run a real hardcore roller spring whereas the true OEM LS7 heads are not that strong there.

Just depends on how far you are trying to go. Shawn is right that for a really crazy solid roller deal the OEM LS7 heads are just not made for that.

My deal is for a street roller that is smoother and slower and doesn't need as much spring pressure similar to the hydraulic roller stuff we can do turning 7500+ rpm.

We've had the same stuff in smaller solid roller cams turning 8000 rpm with no trouble with the right lobes and rockers and springs etc.
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Old 04-17-2010, 04:13 AM
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aftermarket, cam, cams, carb, day, heads, hydraulic, install, ls1, ls7, rocker, roller, setup, solid, springs


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