Hey Guys
Looking for a back up set of heads for my program. Used and bare fine Old castings fine. Running #23538818 OLDS heads now.
Tech question is how much better is the exhaust flow rate of the 1.80" exh valve vs the old 1.90 valve ? Considering converting my current set this winter.
Thanks !

I only run a 1.86 in my stuff. 12* Profilers. I'll guarantee they flow more than the heads you're talking about. 1.900 valve would actually be too big

Our 14 degree Dart s that Foltz did were the best until RFD convinced us we needed a larger valve...Combustion Chamber efficiency is the key to any head...not just how much air some flow bench says they move...

stop believing everything you read on these forums posted by every snake oil salesman.

quote:

Originally posted by TOP1320:
Hey Guys
Looking for a back up set of heads for my program. Used and bare fine Old castings fine. Running #23538818 OLDS heads now.
Tech question is how much better is the exhaust flow rate of the 1.80" exh valve vs the old 1.90 valve ? Considering converting my current set this winter.
Thanks !

Chip

Whats the valve sizes now? 2.4/1.9?

Many older BC heads had this combo which will benefit a bunch by going to a 2.45/1.85 combo. Valve seats usually will limit the amount you can change them.

If you have a 1.90 EX now, you won't be able to put a 1.8 in unless you change the seats.

Hey Al
Yea the int 2.4, ex 1.90 old BC Olds cast

quote:

Originally posted by TOP1320:
Hey Al
Yea the int 2.4, ex 1.90 old BC Olds cast

Chip

Unless your running a bunch of NOS, the heads will respond to changing the valves to the 2.45/1.85 combo. You may be able to tweak them a bit in either direction depending on the seat diameters and the current throat diameters. I did this to Rick Bell's 18 degree heads about 4 years ago and it was worth a tenth in the 1/4 mile with no other changes. I would not change just the exhaust valves.

The Olds 14 degree heads were #22538816
Some were oval, some were rectangle
They still are a nice head.

quote:

Originally posted by Bad News:
The Olds 14 degree heads were #22538816
Some were oval, some were rectangle
They still are a nice head.

I have a set of these on my 632...rectangle. Make good power, thanks Spanky!

Will a standard big chief cast intake bolt up to the #22538816 heads? Don't know if it matters, but they are the oval port version. Also, what intake gasket should be used?