l92/ls3 head differences..
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Staging Lane
Joined: Jan 2011
Posts: 59
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l92/ls3 head differences.. does anyone know exactly what the difference in between l92 and ls3 heads? they look very much alike to me... even available intakes will interchange between them. but there has to be differences... WHAT ARE THEY?
11 Second Club
Joined: Apr 2010
Posts: 36
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From: Fishers, IN
LS3's come with a little stronger springs and lighter valves. Other than that they are indentical. Do yourself a favor and buy bare castings and put aftermarket Lite weight everything in them. Worth every penny...
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Joined: Feb 2007
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From: Battlecreek, MI / Mansfield, OH
i think i read that the ls3 bare castings are cheaper than the l92 bare castings from GM..... ill never figure out GM's parts pricing..... kind of like how you can get a valve cover with 3 coil packs on it for $120, but if you just want to buy one coil pack its like $85
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Its my understanding that LS3- 821, 823 and 5364 Heads castings are all identical.
821's have lighter, better valves.
Early LS3- 2716 Heads don't have the bulge in the upper intake port to help swirl the air.
821's have lighter, better valves.
Early LS3- 2716 Heads don't have the bulge in the upper intake port to help swirl the air.
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True. I work for G.M and see broken valves often.I agree with the aftermarket Light valve and better spring theory.Good advise midevil 1.
Staging Lane
Joined: May 2004
Posts: 78
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From: Oakville, CT
Actually.... the 2010 production camaro 0821 casting has a different intake port from the older L-92/L76 heads, 364/716
.
They will not come out right when you cnc port them with the older program. We, competition cnc, had to develop and make a new program for the new style intake port on the new ls-3 heads.
Some where along the way GM changed the port shape in one of there 4 or 5 part number swaps for the head in the last year.
Its only a matter of time before the other cnc head porters out there figure this out also.
.
They will not come out right when you cnc port them with the older program. We, competition cnc, had to develop and make a new program for the new style intake port on the new ls-3 heads.
Some where along the way GM changed the port shape in one of there 4 or 5 part number swaps for the head in the last year.
Its only a matter of time before the other cnc head porters out there figure this out also.
Actually.... the 2010 production camaro 0821 casting has a different intake port from the older L-92/L76 heads, 364/716
.
They will not come out right when you cnc port them with the older program. We, competition cnc, had to develop and make a new program for the new style intake port on the new ls-3 heads.
Some where along the way GM changed the port shape in one of there 4 or 5 part number swaps for the head in the last year.
Its only a matter of time before the other cnc head porters out there figure this out also.
.
They will not come out right when you cnc port them with the older program. We, competition cnc, had to develop and make a new program for the new style intake port on the new ls-3 heads.
Some where along the way GM changed the port shape in one of there 4 or 5 part number swaps for the head in the last year.
Its only a matter of time before the other cnc head porters out there figure this out also.
