3A heads

77 oldsMAbrotha · August 2nd, 2007, 05:44 PM

Are stock 3A heads worth sending to the machine shop if trying to build up a '77 350+ hp motor with 9.5:1 compression?

At the moment 750 carb, rpm intake, and dynomax headers would be working together with the machined heads.
?In your opinion?
If the heads can perform, then...to the machine shop!

don71 · August 2nd, 2007, 07:53 PM

Those heads are poor on the exhaust flow compared to older heads. I have heard they are a thinner casting in some areas, but can't confirm that.

You have better choices in the 5 6 7 castings and even the 8s are better than the 3A, as is. So, yea try to find another set.

But in all honesty, If I was on a budget and had a good set of 3A heads, with nothing else stopping me......I'd run'em. Oldsmobiles are more fun when they're running

.........than sitting around waiting for whatever.

August 2nd, 2007, 05:44 PM	#1 (permalink)
77 oldsMAbrotha Toliver Join Date: Jun 2007 Location: Indianapolis Posts: 24	3A heads Are stock 3A heads worth sending to the machine shop if trying to build up a '77 350+ hp motor with 9.5:1 compression? At the moment 750 carb, rpm intake, and dynomax headers would be working together with the machined heads. ?In your opinion? If the heads can perform, then...to the machine shop!

August 2nd, 2007, 07:53 PM	#2 (permalink)
don71 feed the pig Join Date: Jun 2007 Location: Central Missouri Posts: 226	Those heads are poor on the exhaust flow compared to older heads. I have heard they are a thinner casting in some areas, but can't confirm that. You have better choices in the 5 6 7 castings and even the 8s are better than the 3A, as is. So, yea try to find another set. But in all honesty, If I was on a budget and had a good set of 3A heads, with nothing else stopping me......I'd run'em. Oldsmobiles are more fun when they're running .........than sitting around waiting for whatever. __________________ 1971 Cutlass S Holiday coupe-455/th400 3.23 Oldsmobile they were meant to be driven.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode