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Timer
05-11-2002, 07:48 AM
I pulled the valve cover off and found this cast on the inside head surface: HI-PERF and G272990. What does this say about the head, if anything? Thanks.
GofastRacer
05-11-2002, 09:37 AM
You have square port open chamber heads, 118cc chambers...... http://free.***boat.net/ubb/cool.gif
Timer
05-11-2002, 10:44 AM
Thanks, Gofast. I assume that's good since I've heard good things about the older open-chamber heads. Are these the best cast iron heads I could have ended up with?
Oldsquirt
05-11-2002, 04:15 PM
Timer, those heads are still available through Chevy under part #6260482. The GM Performance Parts catalog states "This is Chevrolet's best cast iron cylinder head for high-performance big block V-8's"
Timer
05-12-2002, 05:57 AM
Thanks, OLDSQUIRT.
BlownChevy
05-12-2002, 08:13 AM
Try, WWW.MorTec.com (http://WWW.MorTec.com) for more info on your heads and other chevy stuff... it gives you casting numbers
GofastRacer
05-12-2002, 08:23 AM
Originally posted by Timer:
Thanks, Gofast. I assume that's good since I've heard good things about the older open-chamber heads. Are these the best cast iron heads I could have ended up with?
Yes, they are the best factory iron heads...
HammerDown
05-12-2002, 02:31 PM
Damm, I thought the 049's were the best G.M. Heads????
Timer
05-12-2002, 04:07 PM
That's a slick site, BlownChevy. Thanks.
I guess my "G" is really a "6".
I found the quote in the catalog to which OLDSQUIRT refers. It mentions that the exhaust ports are square. When I took off the Bassetts on one side, I noticed the ports were round. Could it be that there has been some grinding done to go from square to round? Seems like that's the only explanation.
Costello
05-12-2002, 08:35 PM
They are square at the intake side, exhaust ports are round.
GofastRacer
05-12-2002, 08:44 PM
Originally posted by HammerDown:
Damm, I thought the 049's were the best G.M. Heads????
You are right, but 049's are oval port heads not square port.. They are about the best factory oval port heads around...... http://free.***boat.net/ubb/smile.gif
[This message has been edited by GofastRacer (edited May 12, 2002).]
MikeF
05-12-2002, 08:48 PM
T, I have the same heads on my boat and yes they are supposed to be square (slightly rounded on the corners). Seems someone has opened yours up a bit! Mike