86 centerbolt heads
Thread Starter
Racer
Joined: Jul 2007
Posts: 462
Likes: 21
From: Kansas City Missouri
86 centerbolt heads
I am trying to find a good set of heads with a chamber size of around 58cc like stock with intake runner volume around 180cc. I have the centerbolt aluminum heads (128's) for the 1986 models. Summit is telling me that they only have one head that will even bolt up to mine. Here is their quoted statement.
Summit:
"These are the L98 heads with center bolt valve covers, but the earlier angle intake bolts. This configuration was used only on the 1986-1991 Corvette. The only direct replacement head available is through Edelbrock."
http://www.summitracing.com/parts/EDL-60879/
These heads have only a 165cc runner volume. He further went on in the next email to tell me that I was placing too much emphasis on the runner length and basically inferred that the 60879's were just fine. Is this guy smoking crack, or are there other good options out there with a little better flow? I was looking at the TFS's with the 175cc runner volume, but again...he said that they didnt' have anything that would bolt up to my 86'.
Summit:
"These are the L98 heads with center bolt valve covers, but the earlier angle intake bolts. This configuration was used only on the 1986-1991 Corvette. The only direct replacement head available is through Edelbrock."
http://www.summitracing.com/parts/EDL-60879/
These heads have only a 165cc runner volume. He further went on in the next email to tell me that I was placing too much emphasis on the runner length and basically inferred that the 60879's were just fine. Is this guy smoking crack, or are there other good options out there with a little better flow? I was looking at the TFS's with the 175cc runner volume, but again...he said that they didnt' have anything that would bolt up to my 86'.
Race Director
Joined: Sep 2003
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From: Database Error Indiana
Yes hes smoking crack. You can use almost any small block head except LT1s. Most can be milled to get the 58 cc chamber. There are also different angles on the spark plugs but thats not usually a problem.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
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From: Australia
As stated you can use any SBC head but you might have to change to reg perimeter bolt covers
Thread Starter
Racer
Joined: Jul 2007
Posts: 462
Likes: 21
From: Kansas City Missouri
Alright. Sorry. The guy kinda freaked me out. I had visions of me purchasing the wrong stuff and then getting screwed or at least hassled in the whole return process. So, the heads will otherwise bolt up fine, the only difference being that the valve covers will have to be changed to accommodate the perimeter bolting style, versus the centerbolt? That being the case, that should bring us full circle to these.
http://www.trickflow.com/partdetail....3&autoview=sku
Other than the fact that I will have to purchase new valve covers, does anyone see a problem here for my application?
http://www.trickflow.com/partdetail....3&autoview=sku
Other than the fact that I will have to purchase new valve covers, does anyone see a problem here for my application?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
That being the case, that should bring us full circle to these.
http://www.trickflow.com/partdetail....3&autoview=sku
http://www.trickflow.com/partdetail....3&autoview=sku
Buy these and put the springs of your choice on for cheaper, then sell the TFS springs
http://www.summitracing.com/parts/TFS-30300001/
Depending on your cam you could run ZZ4/LT4 springs ; good to .525 lift.Under $40 a set from the dealer.
The $$$ difference will pay for your new shiny rocker covers
Last edited by rodj; Oct 4, 2009 at 11:46 PM.
Race Director
Joined: Sep 2003
Posts: 16,836
Likes: 337
From: Database Error Indiana
Alright. Sorry. The guy kinda freaked me out. I had visions of me purchasing the wrong stuff and then getting screwed or at least hassled in the whole return process. So, the heads will otherwise bolt up fine, the only difference being that the valve covers will have to be changed to accommodate the perimeter bolting style, versus the centerbolt? That being the case, that should bring us full circle to these.
http://www.trickflow.com/partdetail....3&autoview=sku
Other than the fact that I will have to purchase new valve covers, does anyone see a problem here for my application?
http://www.trickflow.com/partdetail....3&autoview=sku
Other than the fact that I will have to purchase new valve covers, does anyone see a problem here for my application?
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
The problem would be if you had iron heads, and used 58cc heads to replace the iron originals. They are 64cc if iron.
(The iron headed engines did not get the dished pistons.)
(The iron headed engines did not get the dished pistons.)
Thread Starter
Racer
Joined: Jul 2007
Posts: 462
Likes: 21
From: Kansas City Missouri
what rodj is saying might be a really good idea actually, since I have already purchased the lt4 springs, clips, etc, to revitalize my old heads. The machine shop is pretty cheap on that stuff, so I would definitely be saving money. Hmmmm.
the TFS-30300001 have d-port exhaust where my originals have square exhaust ports. Does this make a difference? The ones I originally linked to had the square exhaust like the factory ones.
the TFS-30300001 have d-port exhaust where my originals have square exhaust ports. Does this make a difference? The ones I originally linked to had the square exhaust like the factory ones.
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Le Mans Master
Joined: Aug 2000
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From: Australia
The 113's alum heads have D ports and used the same exh manifold as the earlier heads
Thread Starter
Racer
Joined: Jul 2007
Posts: 462
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From: Kansas City Missouri
The only other difference I see between the 01's and the 03's is that the 03's have dual springs per valve and the 01's have single springs per valve. Anyone know exactly what that means to me?
Race Director
Joined: Nov 2003
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From: Overland Park Kansas
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Plus, the D-ports would be better if you go with headers (like you mentioned to me).
Dual springs provide add'l valve control for higher lift and/or more aggressive cam profiles. If you're going to use a hotcam, then you don't need dual springs. Buying the base head and swapping your LT4 springs in -- would be the most cost effective solution.
Dual springs provide add'l valve control for higher lift and/or more aggressive cam profiles. If you're going to use a hotcam, then you don't need dual springs. Buying the base head and swapping your LT4 springs in -- would be the most cost effective solution.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
the optional springs rated for a lift you will probably never see.
Thread Starter
Racer
Joined: Jul 2007
Posts: 462
Likes: 21
From: Kansas City Missouri
Thanks guys for all chiming in. I really appreciate you all holding my hand on this deal. I don't know about for you, but spending that kind of money on heads is a lot for me, so I wanted to be sure that I was getting what I needed. looks like I will go with the 01's and then swap in my lt4 springs. I was wondering what I was going to do with those. Seems like a good cost effective solution.
What would the other springs be worth on CF?
BTW when all of this is done and said, I will post pics on the progress. I know how you guys like pics.
What would the other springs be worth on CF?
BTW when all of this is done and said, I will post pics on the progress. I know how you guys like pics.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
