Cylinder Heads
Thread Starter
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
Cylinder Heads
OK I have searched here and a hundred sites trying to determine what heads and the specs there of on my '85 iron head L98. I had a head gasket go bad and subsequent serious overheat condition from exhaust gas entering the coolant jacket.
All the sites I have been to dont really tell me what I have definitively. The only casting numbers I have found are 462624 and a date code of J15. I need to know if these heads are a 76cc combustion chamber.
I have found some brand new never run complete GM Performance heads that were pulled to be replaced by Edelbrock heads for $450. Since rebuilding my original heads may cost this much I thought these new heads might be a viable option. These heads are aluminum and after researching them as well as I can, I find they are very similar to the late '86 L98 113 heads.
I dont have any real plans to modify this engine, I just need to get my car back on the road as quickly as possible. Economy is key here as I have a very limited budget. I am going to check these heads out further when I have cash in hand, making sure that they have the proper sensor bungs and accessory taps.
Any input would be helpful! TIA.
All the sites I have been to dont really tell me what I have definitively. The only casting numbers I have found are 462624 and a date code of J15. I need to know if these heads are a 76cc combustion chamber.
I have found some brand new never run complete GM Performance heads that were pulled to be replaced by Edelbrock heads for $450. Since rebuilding my original heads may cost this much I thought these new heads might be a viable option. These heads are aluminum and after researching them as well as I can, I find they are very similar to the late '86 L98 113 heads.
I dont have any real plans to modify this engine, I just need to get my car back on the road as quickly as possible. Economy is key here as I have a very limited budget. I am going to check these heads out further when I have cash in hand, making sure that they have the proper sensor bungs and accessory taps.
Any input would be helpful! TIA.
Thread Starter
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
The heads have perimeter bolt patterns so I am hoping the intake pattern is standard. I think these are pretty new but I dont know for sure. The guy said they do have 76cc combustion chambers.
Thread Starter
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
THanks. What I have discovered that there were two versions of the 113s. They started at 76cc and they went to 58cc with a piston change in the later years.
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
This is totally incorrect.
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
And if you buy vortec heads you will need a different intake and your exhaust wont wor either.
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Thread Starter
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
This is totally incorrect.
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
This guy is saying these particular heads are off a crate motor but have 76cc chambers. Any idea what they may be off of?
Thread Starter
Safety Car
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From: Jacksonville FL
Race Director
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Call Jason at Vette2Vette and tell him I am asking him to do you a favor and that you are a friend of mine.
He will fix you up and probably save you some money.
815-673-6200
You can try the website at www.vette2vette.com but a phone call should be faster.
He will fix you up and probably save you some money.
815-673-6200
You can try the website at www.vette2vette.com but a phone call should be faster.
Pro
Joined: Apr 2004
Posts: 621
Likes: 37
From: Texas
This is totally incorrect.
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
Thread Starter
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
Finally went to the shop and checked out the heads. I was completely off base, they are cast iron not aluminum. They would be direct replacements for 84-E86 and anything prior for that matter. I should have bought a set but I just couldnt swing that and the other items necessary to complete the job. Gonna get them to refurb my old ones as he said it would only be a couple of hundred as long as nothing is too worn out. Keeping my fingers crossed.
If anyone needs a new set of iron heads complete with valves, rockers and springs for $450, PM me and I will send the link to you.
Thanks for all your responses!!
If anyone needs a new set of iron heads complete with valves, rockers and springs for $450, PM me and I will send the link to you.
Thanks for all your responses!!
Instructor
Joined: Oct 2010
Posts: 215
Likes: 1
This is totally incorrect.
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
Instructor
Joined: Oct 2010
Posts: 215
Likes: 1
Just FYI the 84-85 624 heads were used with flat top pistons with a valve relief trough and a thin .015 head gasket and 76cc chamber to yield 9.0 compression. The 113 heads used in 89 L98 used dished piston with a thick .051 head gasket and 58cc chamber
Drifting
Joined: Mar 2006
Posts: 1,263
Likes: 188
From: Wabasha Mn
You can buy a set of new summit/dart cast iron large valve heads for $630 and free shipping. They have modern 72cc chambers, .525 lift springs, and screw in rocker studs. I replaced my 624's with a set of these. #152123 I believe is the part number. 624 heads are pretty much the worst of the worst!!!
Intermediate
Joined: Jan 2020
Posts: 48
Likes: 3
From: Keller, Texas
This is totally incorrect.
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
The 113 cyl head has 58cc chambers, .100 raised 165cc intake runners and D shaped exhaust ports... it was released in the 1988 model year and used on L98 Corvettes until 1991. In 1989 it was used on the newly released GMPP ZZZ, then in 1990 on the ZZ3 and is still used to this day on the ZZ4 crate engines.
The predecesor to the 113 (the 128) also has 58cc chambers, std position 163cc intake runners and conventional exhaust ports. It was used on (mid)1986 thru 1987 model year L98 Corvettes.
Will
