Upgrade heads
Thread Starter
Intermediate
Joined: Feb 2003
Posts: 28
Likes: 0
From: Cincinnati OH
Upgrade heads
In planning an upgrade on my 84 it looks like the best bank for is a pair of L98s. How would I find out if the exhisting heads are 6 or 7 hole without pulling them ? Thanks 
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
6 or 7 hole what?
The later L98 heads will fit that block... and should fit the crossfire... but I wouldn't put the stock xfire intake back on. I would consider getting an upgrade to that intake. The xfire, by it's very nature isn't the problem - the intake manifold is.
there are options... the xfire people will be in, I am sure. there is one, the name escapes me, that uses a modifed aluminum intake to do the job. much better flow rates.
new heads would mean zip if you kept the factory intake.
The later L98 heads will fit that block... and should fit the crossfire... but I wouldn't put the stock xfire intake back on. I would consider getting an upgrade to that intake. The xfire, by it's very nature isn't the problem - the intake manifold is.
there are options... the xfire people will be in, I am sure. there is one, the name escapes me, that uses a modifed aluminum intake to do the job. much better flow rates.
new heads would mean zip if you kept the factory intake.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by bogus
6 or 7 hole what?
the xfire people will be in, I am sure. there is one, the name escapes me, that uses a modifed aluminum intake to do the job. much better flow rates.
the xfire people will be in, I am sure. there is one, the name escapes me, that uses a modifed aluminum intake to do the job. much better flow rates.
"6 or 7 hole what?"
RACE ON!!!
Bench Racer
Joined: Feb 2003
Posts: 4,201
Likes: 15
From: Palm Beach Gardens FL
St. Jude '03 thru 14,'25
If you aren't already aware of it, there's a site pretty much dedicated to the 84 Vette and Crossfire engine:
http://www.crossfire.webhop.net/?
http://www.crossfire.webhop.net/?
Advanced
Joined: Jul 2004
Posts: 98
Likes: 1
From: Maple Grove Minnesota
I'm in the middle of upgrading my '90 L98 and I originally planned to use my stock L98 heads and have them ported by TPIS. They told me the flow would be 270 at 0.600 lift after they ported them. I figured that was pretty good flow, particularly for the size intake on the L98 heads which would yield a higher velocity and promote torque. This also seemed more convenient since the combustion chamber on the L98 heads is 58 cc and the smallest I was seeing in aftermarket heads was 64 cc and I didn't want to lose compression, shave my block or mill the heads.
They advertise an exchange where they will give you a set of heads already done and you just give them yours in exchange (plus their fee of $1250 of course), problem is when I went to do the exchange, they said they didn't have any heads to give me, and it would be a minimum of 2 weeks to machine my heads. Long story short, I ended up buying new Dart heads and shaving my block to maintain my compression ratio.
If you are interested in the L-98 heads, let me know. I have a set already cleaned up and ready to go that I can make you a deal on. For what it's worth, I also had quotes for having my L-98 heads ported elsewhere for about half the price, but also 2 weeks minimum.
They advertise an exchange where they will give you a set of heads already done and you just give them yours in exchange (plus their fee of $1250 of course), problem is when I went to do the exchange, they said they didn't have any heads to give me, and it would be a minimum of 2 weeks to machine my heads. Long story short, I ended up buying new Dart heads and shaving my block to maintain my compression ratio.
If you are interested in the L-98 heads, let me know. I have a set already cleaned up and ready to go that I can make you a deal on. For what it's worth, I also had quotes for having my L-98 heads ported elsewhere for about half the price, but also 2 weeks minimum.
