L98 Head Question
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: L98 Head Question (guywade)
When the aluminum L98 heads first came out...they were the 'HOT' ticket, because you could buy a brand new ready to run complete set from GM for $700-800, and they outperformed most cast iron heads. They definitely outperform the L83 head.
Since then, GM has came out with a few better flowing mods of the L98 head, and the LT-1 is even better than that. This is not even starting to get into aftermarket head performance...Brodix has what I think is the BEST performing heads on earth...but some would argue others are, so I guess it all depends on what your looking for.
Now: If you want to put on the L98 head in place of the L83 head, it would reason the 58 CC chamber volume of the L98 would make a differnce in compression over the 68 CC volume of the L83 head ( If that is the right volume for the L83, but I'm not dead sure about that number ). The real question is...Do you want higher compression? I have such a hard time with fuel quality...I wish I had a lower compression engine sometimes.
Since then, GM has came out with a few better flowing mods of the L98 head, and the LT-1 is even better than that. This is not even starting to get into aftermarket head performance...Brodix has what I think is the BEST performing heads on earth...but some would argue others are, so I guess it all depends on what your looking for.
Now: If you want to put on the L98 head in place of the L83 head, it would reason the 58 CC chamber volume of the L98 would make a differnce in compression over the 68 CC volume of the L83 head ( If that is the right volume for the L83, but I'm not dead sure about that number ). The real question is...Do you want higher compression? I have such a hard time with fuel quality...I wish I had a lower compression engine sometimes.
Drifting
Joined: Mar 2001
Posts: 1,636
Likes: 3
From: Lafayette IN
Re: L98 Head Question (Ho84Z51)
Thanks for the information, I can see this is going to take some study.
My advice? Read everything you can. Dump out all the information because it is false. You will never find 3 people who agree on anything and if they do agree, it is only because it is the only brand they have tried.
Believe me, it is turning out that way. If you are on a tight budget, then it makes it even worse. -Matt-
[Modified by HighHopes85, 3:53 PM 6/8/2002]
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Burning Brakes
Joined: Apr 2001
Posts: 904
Likes: 0
From: Langley, BC, Canada
Re: L98 Head Question (HighHopes85)
l83 heads are 76cc the same as 85 l98 heads
Yes it can be done, but you need to do a little modifying first.
you need to modify the combustion chamber a little other wise you'll get an 11:1 compression with the stock pistions, you'll also need to use center bolt valve covers
go here http://www.crossfire.homeip.net:81/cftest/
There is a very detailed tech article on how to port the l98 heads and reduce the compression.
Yes it can be done, but you need to do a little modifying first.
you need to modify the combustion chamber a little other wise you'll get an 11:1 compression with the stock pistions, you'll also need to use center bolt valve covers
go here http://www.crossfire.homeip.net:81/cftest/
There is a very detailed tech article on how to port the l98 heads and reduce the compression.
Burning Brakes
Joined: Oct 1999
Posts: 1,236
Likes: 91
From: Pittsburgh,PA
Re: L98 Head Question (nsimmons)
Don't for get about the Vortec heads they will out flow the l98 easily and they are cheap new compleat they go for $425 use on e bay about $250 you will need a different intake if you are staying with a carb you have a couple choices.
Dave
:flag
Dave
:flag
Melting Slicks
Joined: Apr 2002
Posts: 3,019
Likes: 0
From: down that one road next to that big tree
Re: L98 Head Question (opel)
the 64cc edelbrock rpm head is my vote, under 1000 dollars and the compression will be alright without mods. they breath MUCH better than even the raised exhaust zz4 head and still have a 170cc runner. why spend 800 on nice L98 heads when the edelbrocks have the smaller runner but MUCH better flow, also the cc chamber you want to start with.
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: L98 Head Question (Ho84Z51)
Air Flow Research heads are great. You can get them in almost any CR you want. CNC ported right out of the box with a FIVE angle valve job! D ports! 2.02 intake/ 1.60 exhast swirl polished valves ( I think they are stainless) and there's more...Go here: http://www.airflowresearch.com/
[Modified by GRX, 5:49 PM 6/8/2002]
[Modified by GRX, 5:49 PM 6/8/2002]
Drifting
Joined: Aug 2000
Posts: 1,316
Likes: 0
From: Houston, TX
Re: L98 Head Question (GRX)
Performance Chevy, no web site, but says they are open 365 days/year.
800-203-6624
AFR's $1099.99
Trick Flow 23 degree $895.00
free shipping, Check to be sure they have the springs/valves etc you need for your application. Also the Pro Action Lightning heads made in Australia are getting some good reports. http://www.procylinderheads.com
also check http://www.competitionproducts.com
[Modified by HWoods, 11:29 PM 6/8/2002]
800-203-6624
AFR's $1099.99
Trick Flow 23 degree $895.00
free shipping, Check to be sure they have the springs/valves etc you need for your application. Also the Pro Action Lightning heads made in Australia are getting some good reports. http://www.procylinderheads.com
also check http://www.competitionproducts.com
[Modified by HWoods, 11:29 PM 6/8/2002]
