Hmmmm.....are LS7 camshafts going to be interchangeable?
Hmmmm.....are LS7 camshafts going to be interchangeable? After viewing this pic of the offset LS7 intake rockers this leads me to believe that due to the oiling hole on the offset rocker being even further offset from the centerline of the rocker bolt that the camshaft of an LS7 does not have the same lobe spacing as a standard LSX block since I can't imagine the valvetrain geometry with an angled pushrod and then if would have to be a different length too.....could this be? Am I missing something here? Anyone else care to speculate?
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From: Norcal
I just read today in Super Chevy(at the grocery store library) and they mentioned the reason for the offset, I belive( I should have bought the magazine,lol) it has to do with the way the valvles are positined in the head. Something to do with the valve angles and them being siamesed. I could be completely wrong though.
it has to do with the way the valvles are positined in the head.
Something to do with the valve angles and them being siamesed
Angling the pushrods a little shouldn't be too big of a problem. Big Block Chevys do this as do Dodge Hemis (the old ones). I suspect the wider intake port and larger 2.20" valve necessitated offsetting the rocker to place it directly over center. I am almost 100% certain that the LS7 cams will interchange with all Gen 3 and 4 V-8s.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
The offset rocker is so the port can be wider than the cathedral design, the pushrod needs to go over so the port can get more of a rectangle shape. The cams will not have the sync pulse ground on them so they will not interchange with a gen 3. They may still work in a gen 4 as it has a sync pulse on the upper timing gear also.
Kurt
Kurt
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From: Texas
Originally Posted by 427
The offset rocker is so the port can be wider than the cathedral design, the pushrod needs to go over so the port can get more of a rectangle shape. The cams will not have the sync pulse ground on them so they will not interchange with a gen 3. They may still work in a gen 4 as it has a sync pulse on the upper timing gear also.
Kurt
Kurt
Trending Topics
That looks like a solution that would work. So if you want to run a stock gen 4 cam in your gen 3, you would change the cover the sensor and the upper timing gear.
Kurt
Kurt
Originally Posted by O6blues
So you could use the LS7 cam in a Gen3 if you changed to the Gen4 timing cover and cam gear --- Correct?
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You guys are looking at the geometry wrong... the pushrod can be strait, and the cam lobs be in the same position. They are using a 12 degree head with a very large intake valve... the rocker is shaped different, to deal with this..which we can all see in the picture...however the easiest thing for the GM engineers to have done is simply reposition the location of the rocker studs. This is probably what they have done, and thus are keeping the rest of the valvetrain geometry in the ls1/ls6/ls2 positions.
Originally Posted by ChucksZ06
Popular Hot Rodding showed the LS 7 cam as 230/211. I think Vette Fever had the numbers reversed. 230 on the intake makes sense.
THAT IS THE OPPOSITE OF WHAT YOU STATED
Last edited by gto69judge; Mar 4, 2005 at 02:25 PM.
TECH Apprentice
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If intake is only 211@.05" then there is lots to gain by going to even
a 235@.05" cam.
I'm thinking the 230 is on the intake side and 211 is on exaust.
OEM does wierd splits like this, don't know exact reasons, thought it was
good for smog.
My thought for offset rocker/angled pusrhod is ports are wider necessitating
it.
a 235@.05" cam.
I'm thinking the 230 is on the intake side and 211 is on exaust.
OEM does wierd splits like this, don't know exact reasons, thought it was
good for smog.
My thought for offset rocker/angled pusrhod is ports are wider necessitating
it.
230 on the intake makes no sense....You have a huge freaking intake valve..it's getting plenty of air. The exhaust is what is lacking. I've never seen a stock GM cam on a reverse split. There is no need. I'll put money on it being 211/230..straight with a large split is how GM does it and usually wide LSA's
Originally Posted by Unaffiliated Racing
230 on the intake makes no sense....You have a huge freaking intake valve..it's getting plenty of air. The exhaust is what is lacking. I've never seen a stock GM cam on a reverse split. There is no need. I'll put money on it being 211/230..straight with a large split is how GM does it and usually wide LSA's
TECH Apprentice
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If it is ONLY 211 on the intake side there will be a nice gain released. HOwever stock power peak is @ 6200 RPM, so my guess is it is 230 on the intake side. With long tube headers only this thing will wake up. And with a cam that doesnt care about emissions
it will really come up. Expecting close to 600rwhp with ONLY head and cam alone.
it will really come up. Expecting close to 600rwhp with ONLY head and cam alone.
when has GM ever put a reverse split in a gen3 motor. they stick with what works and they improve upon it, not change it. 97 - 04 ls1 cams, 01-04 ls6 cam, hot cam, ASA cam, grand am cam, all traditional spit.