Head Input needed!
Thread Starter
Pro
Joined: May 2007
Posts: 635
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From: Fargo ND
Head Input needed!
Lookin at a set of heads...they are LS6 TSP Heads stage 1.5. 243 castings with less then 9k on them. Sodium lightweight valves. Springs good to 550 lift and are brand new, never run. milled to 58 cc. On a stock motor should be close to 11:1 CR. You will need locks and retainers. Heads were inspected and valve job is still perfect.
Im running a 1997 c5 ls1 with tr224r cam, LT headers, and CAI. These sound like a good set of heads for me? What would be a good price?
Im running a 1997 c5 ls1 with tr224r cam, LT headers, and CAI. These sound like a good set of heads for me? What would be a good price?
Burning Brakes
Joined: Jun 2006
Posts: 933
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From: St. Paul MN
With a 62cc chamber you can get 11:1 with a .041 head gasket (10.8:1 with the stock .051 head gasket). With a 58cc chamber you're probably looking at a 11.6:1 compression ratio. The stock combustion chamber on a LS1 head is 66.6cc (which produces 10.1:1). The LS6 achieves a 10.5:1 from a 64cc chamber.
Thread Starter
Pro
Joined: May 2007
Posts: 635
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From: Fargo ND
so your saying pass? I was thinkin the same thing ...
1) 58cc is awful small for my cam, unless I have forged pistons with valve reliefs. Iwould need to run that cam on a 114* ICL angle to get by, and with stock .053 thick gaskets. Any more advance or thinner gasket & my DCR will be too high for 93 octane pump fuel .
2) Even the lower lift TR224 cam is going to require a valve spring upgrade
Sounds to me like someone had a bigger cam, upgraded their heads, and kept all the old valvetain components to make a complete head. What is left over seems to be some mismatched parts (i.e. - you would never need that small of a chamber with valve springs that mild).
1) 58cc is awful small for my cam, unless I have forged pistons with valve reliefs. Iwould need to run that cam on a 114* ICL angle to get by, and with stock .053 thick gaskets. Any more advance or thinner gasket & my DCR will be too high for 93 octane pump fuel .
2) Even the lower lift TR224 cam is going to require a valve spring upgrade
Sounds to me like someone had a bigger cam, upgraded their heads, and kept all the old valvetain components to make a complete head. What is left over seems to be some mismatched parts (i.e. - you would never need that small of a chamber with valve springs that mild).
Burning Brakes
Joined: Jun 2006
Posts: 933
Likes: 0
From: St. Paul MN
Also with the head milled to produce a 58cc chamber, provided most of it wasn't achieved by welding in the combustion chamber, any decent sized cam might have piston to valve clearance issues.
I'm going to be running the Dart Pro 1s with a 62cc chamber and with the cam I'm going to run (228/231 .571/.573 112sep) I would potentially be pushing my luck with the .041 head gasket if I didn't fly-cut the pistons.
I'm going to be running the Dart Pro 1s with a 62cc chamber and with the cam I'm going to run (228/231 .571/.573 112sep) I would potentially be pushing my luck with the .041 head gasket if I didn't fly-cut the pistons.
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Burning Brakes
Joined: Jun 2006
Posts: 933
Likes: 0
From: St. Paul MN
Yep, if you fly cut the pistons you would be able to run them for sure. You might be able to run them without fly-cutting the pistons but you would have to check them to be sure. The recommendation is that you have a minimum of .100" of clearance on the exhaust and .080" on the intake. A simple clay test would determine if you needed to fly cut the pistons.
Thread Starter
Pro
Joined: May 2007
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From: Fargo ND
Seller sent me this pm
Originally Posted by largeitalian
do you think I would have to flycut to clear? im running a tr224r like I mentioned.
NOPE!!! I can send you pics of the pistons right now as (im taking a break and just about to pull the motor out) there were no clearance issues when i ran a bigger cam, 232-236 comp cam. Stock gm head gasket, stock length push rods.
do you think this is legit?
Originally Posted by largeitalian
do you think I would have to flycut to clear? im running a tr224r like I mentioned.
NOPE!!! I can send you pics of the pistons right now as (im taking a break and just about to pull the motor out) there were no clearance issues when i ran a bigger cam, 232-236 comp cam. Stock gm head gasket, stock length push rods.
do you think this is legit?
Burning Brakes
Joined: Jun 2006
Posts: 933
Likes: 0
From: St. Paul MN
Seller sent me this pm
Originally Posted by largeitalian
do you think I would have to flycut to clear? im running a tr224r like I mentioned.
NOPE!!! I can send you pics of the pistons right now as (im taking a break and just about to pull the motor out) there were no clearance issues when i ran a bigger cam, 232-236 comp cam. Stock gm head gasket, stock length push rods.
do you think this is legit?
Originally Posted by largeitalian
do you think I would have to flycut to clear? im running a tr224r like I mentioned.
NOPE!!! I can send you pics of the pistons right now as (im taking a break and just about to pull the motor out) there were no clearance issues when i ran a bigger cam, 232-236 comp cam. Stock gm head gasket, stock length push rods.
do you think this is legit?
I would think it's legit. It also depends on how the 58cc combustion chambers were achieved. Patriot Performance achieves a 59cc combustion chamber on the LS6 heads by welding up the combustion chamber. If your heads are similar running your cam shouldn't require fly cutting the pistons.
Also, you can perform the fly cutting yourself...its pretty straight forward and there are several tools available...of course I've never actually done it myself.
Burning Brakes
Joined: Jun 2006
Posts: 933
Likes: 0
From: St. Paul MN
What price are you hoping to get for these heads? You can pick up a new set of Patriot Performance heads for around 1k. Here is a couple of links that discuss some of the heads available so you can compare your heads.
http://forums.corvetteforum.com/show....php?t=1859936
http://forums.corvetteforum.com/show....php?t=1866372
http://forums.corvetteforum.com/show....php?t=1859936
http://forums.corvetteforum.com/show....php?t=1866372