merrick
Member
Is the Callaway block or heads o-ringed? What kind of head gasket is used? Thanks
O-ringed
- Thread starter merrick
- Start date
*89x2*
Well-known member
Although the assembly specs do not specifically state "O Ring Heads", the engine is thoroughly machined. You may want to send this question to Wayne at Callaway Cars wmccurdy@callawaycars.com
hope this helps
hope this helps
9
90Callaway
Guest
No O-Rings
The TTs do not have any machining for O-rings between the block and head. Most of the TTs are only running 7.5:1 compression and around 12-12.5 pounds of boost. That's pretty mild. Some of the very late cars run 8.5:1 and higher boost of about 13.5-14 pounds. Still no special considerations. I've never heard of a Callaway blowing out head gaskets unless maybe it was really abused. As far as I know the gaskets are stock GM or maybe aftermarket like FelPro.
The machinging they did do to the block and heads is -
Machine the block (2-bolt) for splayed 4-bolt main caps
Line bore and deck the block
Deck the heads
They also used a cross drilled forged steel crank. I think they also changed the valve springs and possibly the valves themselves. There is no other machining to the heads - no bigger valves, no porting or polishing.
The TTs do not have any machining for O-rings between the block and head. Most of the TTs are only running 7.5:1 compression and around 12-12.5 pounds of boost. That's pretty mild. Some of the very late cars run 8.5:1 and higher boost of about 13.5-14 pounds. Still no special considerations. I've never heard of a Callaway blowing out head gaskets unless maybe it was really abused. As far as I know the gaskets are stock GM or maybe aftermarket like FelPro.
The machinging they did do to the block and heads is -
Machine the block (2-bolt) for splayed 4-bolt main caps
Line bore and deck the block
Deck the heads
They also used a cross drilled forged steel crank. I think they also changed the valve springs and possibly the valves themselves. There is no other machining to the heads - no bigger valves, no porting or polishing.
*89x2*
Well-known member
Kevin - I was hoping you would chime in on this. Thanks
9
90Callaway
Guest
No problem, dude. 
I also meant to point out that they use a bone stock L98 camshaft for whatever year car it was. The grind changed slightly over the five year life of the program.
I also meant to point out that they use a bone stock L98 camshaft for whatever year car it was. The grind changed slightly over the five year life of the program.
*89x2*
Well-known member
Kevin - Thanks for the reminder to dig up a cam shaft spec sheet for the L98's... It would be really interesting to compare those specs 
-Thanks again
-Thanks again
- Thread starter
- #7
merrick
Member
Thanks for the info. I would like to see those cam specs too! Lots more questions to come
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