I have a BARE set of 990 open chamber 118cc heads that i'm considering a rebuild on

OR...

buy GM # 12363392 ALUMINUM Ovals with 110 cc Closed ports @ 1,629.00 $ a pair Thru a GM dealer here in Florida.


Whatta Ya Think ??? :confused:

(Motor is a 454 2 bolt with forged crank. cam will probably be 230 - 235 duration @ .50. Motor will go in a 65 Chevelle convertible, 3.73 gears , 99% Street Driven ) .

What size engine??

Sorry graemlins/clonk.gif , Rebuilding a 454 2 bolt main with forged crank. Cam will probably be 230 - 235 duration @ .50

The 990's are to big for your application. The GM heads are actually Edelbrock Performer RPM oval ports, and I would actually go with the following from Summit EDL-60499. These are the high compression version of the same head, allowing you to run a flat top piston for better combustion, and save you some money on the pistons to boot.
The heads are at Summit for $879 each, assembled.

You never answered my question the last time you asked....

How important is ET to you? Because you can run those heads and have a fine street motor, it just won't give you the ET smaller port will. You'll smoke the radials either way......

Please define your goals....

E.g., I hear the GMPP Crate 454 is a total slug down low with rect ports.... NOT.

They're not the best, agree with TJC, but will work fine as long as all you need is a set of valves, and a valve job.i.e., DO NOT spend a bunch of money on them.

3.73 is a bunch of gear for a street 454.

Mid to low 12 sec E.T. would be great :D
This car is a street driven cruiser, all out e.t. is not my focus. I am considering aluminum heads and intake mainly to try to get back to smallblock weight range after the " transplant " from 327 to 454 .

I can tell you this. I swapped my "990"'s @ 110cc; this summer (which were on a 439") to the "390's aluminum and I went from a 7.82 to a 7.58 in 1/8th mile. Saved 77lbs. 60' time went from 1.74 to 1.677. I had the heads milled to get a 104cc chamber. I suppose the increase in compression and the weight savings attributed to performance gains also. graemlins/thumbsup.gif

http://www.samtaylor.com/html/parts.html

Here they are for $1609 you can get the big valve version for $1629

Originally posted by 65 Convertible:
Mid to low 12 sec E.T. would be great :D
This car is a street driven cruiser, all out e.t. is not my focus. I am considering aluminum heads and intake mainly to try to get back to smallblock weight range after the " transplant " from 327 to 454. I would stick with ovals and an aluminum dual plane intake. A buddy of mine went 12.30s in good weather with stock oval ports (small valve, closed chamber)with nothing more than a comp 280H. His mill was a 427 with 3.37s and a 10" 3500 stall. Excellent street car.

I also had a 9.1 454, with mild bowl work, 2.19 / 1.88 valves, comp 280H cam and went 12.50s at 110 with an M21 and 3.73`s!

You could probably trade the 990`s for a set of ovals that are ready to bolt on. I would not worry about the weight diff. especially since you are looking for a "street driven cruiser`.

At any rate it sounds like it will be a fun combo! Have fun!

Originally posted by roger69:
http://www.samtaylor.com/html/parts.html

Here they are for $1609 you can get the big valve version for $1629 THANX for the tip graemlins/beers.gif ,
That's here in Florida too !!!

Anyone see any problems with using a BIG , say .250 dome ( if i use the 990's ) to get a streetable compression ? 9.5 - 10 to 1

Whatever dome you choose, make sure you can upgrade the heads if you want to. I don't believe a full open chamber piston is going to fit a newer chamber design. Consult with the piston manu before you decide. Don't just pick one out of the catalogue.
and no, there is no problem running a dome, it's just not as preferable as a flat top in terms of combustion and weight.