LS3 Top end
Thread Starter
Burning Brakes
Joined: Feb 2013
Posts: 1,021
Likes: 52
From: Coral Springs, FL
LS3 Top end
Just purchased some 821 heads and wish to maintain stock compression. Can someone please confirm the following....
I will need to have the heads milled .030 and cc'd to 64 cc?
Will my bolts for the LS2 manifold work for the LS3 manifold?
I need head gaskets that are .040 thick? Can our should I buy LS9 had gaskets?
Thanks
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I will need to have the heads milled .030 and cc'd to 64 cc?
Will my bolts for the LS2 manifold work for the LS3 manifold?
I need head gaskets that are .040 thick? Can our should I buy LS9 had gaskets?
Thanks
Sent from my HTC One using IB AutoGroup
Safety Car
Joined: Jan 2004
Posts: 4,974
Likes: 14
From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
Just purchased some 821 heads and wish to maintain stock compression. Can someone please confirm the following....
I will need to have the heads milled .030 and cc'd to 64 cc?
Will my bolts for the LS2 manifold work for the LS3 manifold?
I need head gaskets that are .040 thick? Can our should I buy LS9 had gaskets?
Thanks
Sent from my HTC One using IB AutoGroup
I will need to have the heads milled .030 and cc'd to 64 cc?
Will my bolts for the LS2 manifold work for the LS3 manifold?
I need head gaskets that are .040 thick? Can our should I buy LS9 had gaskets?
Thanks
Sent from my HTC One using IB AutoGroup
Not sure on the intake manifold bolts.
Thread Starter
Burning Brakes
Joined: Feb 2013
Posts: 1,021
Likes: 52
From: Coral Springs, FL
The cam will be an ecs small blower cam. I doubt I will need to flycut the pistons. ithink the lift on that cam is under .590. I plan on supercharging down the road, but want to keep stock compression so that she isn't a dog while N/A. Thanks for the info.
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Sent from my HTC One using IB AutoGroup
Last edited by slow goat; Jun 19, 2014 at 08:00 PM.
Safety Car
Joined: Jan 2004
Posts: 4,974
Likes: 14
From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
The cam will be an ecs small blower cam. I doubt I will need to flycut the pistons. ithink the lift on that cam is under .590. I plan on supercharging down the road, but want to keep stock compression so that she isn't a dog while N/A. Thanks for the info.
Sent from my HTC One using IB AutoGroup
Sent from my HTC One using IB AutoGroup
Thread Starter
Burning Brakes
Joined: Feb 2013
Posts: 1,021
Likes: 52
From: Coral Springs, FL
The fact that you are supercharging it would have been nice to know before. With that in mind, don't mill the heads, just use a .040 head gasket and the proper length pushrod, then, when you put the supercharger on, replace the head gaskets with the LS9 and replace the pushrods.
Safety Car
Joined: Jan 2004
Posts: 4,974
Likes: 14
From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
Blowers and NA are exclusive of each other, camshaft design can help, but what helps a blower isn't exactly the best for NA.
Install the cam and wait to install the heads till you're ready to install the power adder.
Install the cam and wait to install the heads till you're ready to install the power adder.
Le Mans Master
Joined: Dec 2005
Posts: 7,002
Likes: 1,687
From: Southeast TX
I'd use the thinnest head gasket that will reliably seal your motor. Going that direction will allow you to mill the least. I'd do it all at once. There's a jillion supercharged stock compression LS1,2,3, and even 7's living long and living large. Nothing wrong with running stock compression if the tune is right, you have good quality (consistent) fuel, and have an adequate fueling system.
Thread Starter
Burning Brakes
Joined: Feb 2013
Posts: 1,021
Likes: 52
From: Coral Springs, FL
I'd use the thinnest head gasket that will reliably seal your motor. Going that direction will allow you to mill the least. I'd do it all at once. There's a jillion supercharged stock compression LS1,2,3, and even 7's living long and living large. Nothing wrong with running stock compression if the tune is right, you have good quality (consistent) fuel, and have an adequate fueling system.
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Safety Car
Joined: Jan 2004
Posts: 4,974
Likes: 14
From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
Lower compression will allow more boost, which equals more power, without bandaids.
I suggest you call the people you plan on getting your supercharge from and ask their opinion.
I suggest you call the people you plan on getting your supercharge from and ask their opinion.