Is ZZ4 cyl head direct replacement?
Thread Starter
Heel & Toe
Joined: Jul 2007
Posts: 19
Likes: 0
Is ZZ4 cyl head direct replacement?
Hi
Can i replace my 1990 L98 cyl heads with:
GM Performance 12556463 - GM Performance ZZ4 Aluminum Cylinder Heads?(not looking for more performance).
I know both have the same casting no: 113, but can i use my old rockers? GM Performance site says "Use rail type rockers P/N 10089648"
and
"Exhaust ports are raised .100".
I guess this is the same as my old heads since they both are 113 castings?
Do they have all atacthment points as my old heads?
My old cyl heads are leaking coolant, and instead of spending money on them i am considering replacing them.
Thanks
Raymond
Can i replace my 1990 L98 cyl heads with:
GM Performance 12556463 - GM Performance ZZ4 Aluminum Cylinder Heads?(not looking for more performance).
I know both have the same casting no: 113, but can i use my old rockers? GM Performance site says "Use rail type rockers P/N 10089648"
and
"Exhaust ports are raised .100".
I guess this is the same as my old heads since they both are 113 castings?
Do they have all atacthment points as my old heads?
My old cyl heads are leaking coolant, and instead of spending money on them i am considering replacing them.
Thanks
Raymond
Melting Slicks
Joined: Mar 2004
Posts: 2,141
Likes: 2
From: Pittsburgh Pa
they are the same head but have lt4 springs on them instead of the factory L98 spring. your stock rocker arms are rail style so they would work.. for the money i would buy a better set of heads than those.
Melting Slicks
Joined: Mar 2004
Posts: 2,141
Likes: 2
From: Pittsburgh Pa
i unlike others am not going to sit back and tell you buy brand x head... depends on your budget and what hp goals you are looking to reach which it doesn't really seem like you are cause you are only looking into factory castings.
Thread Starter
Heel & Toe
Joined: Jul 2007
Posts: 19
Likes: 0
I am not looking for more h.p. Just want my coolant leak sorted and a pair of fresh heads.
$569.95
http://www.summitracing.com/parts/NAL-12556463/
$569.95
http://www.summitracing.com/parts/NAL-12556463/
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Le Mans Master
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St. Jude Donor '09-'10-'11
Does a '90 cylinder head have a 58cc combustion chamber also? Wouldnt other heads other than the ZZ4 or expensive ones lower compression?
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
A set of Patriots would be much less, pick up some power too.
Heck even some Edelbrock performers will improve it for about $1000/pair and are better imo than the GM heads.
Heck even some Edelbrock performers will improve it for about $1000/pair and are better imo than the GM heads.
Melting Slicks
Joined: Mar 2004
Posts: 2,141
Likes: 2
From: Pittsburgh Pa
Melting Slicks
Joined: Mar 2004
Posts: 2,141
Likes: 2
From: Pittsburgh Pa
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
Thread Starter
Heel & Toe
Joined: Jul 2007
Posts: 19
Likes: 0
It seems Edelbrock Performer heads are close to 700
SINGLE PERF. 5.7 CORVETT
Part #E60879Price: $699.99
Edelbrock Performer:
60cc Assembled Angled Plug SB Chevrolet Performer Cylinder Head
http://www.sdparts.com/product/E6087...inderHead.aspx
SINGLE PERF. 5.7 CORVETT
Part #E60879Price: $699.99
Edelbrock Performer:
60cc Assembled Angled Plug SB Chevrolet Performer Cylinder Head
http://www.sdparts.com/product/E6087...inderHead.aspx
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
It seems Edelbrock Performer heads are close to 700
SINGLE PERF. 5.7 CORVETT
Part #E60879Price: $699.99
Edelbrock Performer:
60cc Assembled Angled Plug SB Chevrolet Performer Cylinder Head
http://www.sdparts.com/product/E6087...inderHead.aspx
SINGLE PERF. 5.7 CORVETT
Part #E60879Price: $699.99
Edelbrock Performer:
60cc Assembled Angled Plug SB Chevrolet Performer Cylinder Head
http://www.sdparts.com/product/E6087...inderHead.aspx
$ 700 each one
Check this thread
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
Are the heads cracked or is just the gasket blown? If the heads are good otherwise, and you're not going to go crazy with mods, it's not an expensive fix if you DIY.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
I am not looking for more h.p. Just want my coolant leak sorted and a pair of fresh heads.$569.95
http://www.summitracing.com/parts/NAL-12556463/
http://www.summitracing.com/parts/NAL-12556463/
56cc give you a nice little CR boost at no more cost than the ZZ4's
http://www.summitracing.com/parts/TFS-30300005/
Last edited by rodj; Aug 24, 2009 at 06:58 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Here are your stock GM replacement heads through Summit
http://www.summitracing.com/parts/NAL-12556463/
Trick Flow 175 a step up for sure
Edit
Just called Summit...Edelbrock 60859 are $1309 a pair, wow they have gone up $300/pr since last time I checked.
Maybe shop around and see if there are some for less but Summit is usually the lowest or one of them.
I wouldnt spend that much on them, youre in the $ range of a real nice AFR which is probably overkill for what you have.
See if we can find a link and see what Patriot offers, Trick Flow so far looks like the best for the $ so far.
http://www.summitracing.com/parts/NAL-12556463/
Trick Flow 175 a step up for sure
Edit
Just called Summit...Edelbrock 60859 are $1309 a pair, wow they have gone up $300/pr since last time I checked.
Maybe shop around and see if there are some for less but Summit is usually the lowest or one of them.
I wouldnt spend that much on them, youre in the $ range of a real nice AFR which is probably overkill for what you have.
See if we can find a link and see what Patriot offers, Trick Flow so far looks like the best for the $ so far.
Last edited by cv67; Aug 24, 2009 at 08:04 PM.
