[QUOTE=techinspector1;381144]
Quote Originally Posted by yblow View Post
Couldn't find much about the heads except that they probably won't work for any kind of performance application. Here's a comment stolen from Camaros.net....
"I am assuming by L-29 you are using GM head number 10114156 '91-'01 Gen. V & VI 454, "round port" (195cc intake ports ); Open style 115cc chamber; uses adjustable 2.06" intake valve and 1.72" exhaust valve (as opposed to the newer '96 up "Vortec 7400" 10141279 heads with non-adjustable rocker stud nuts). This 156 head is a truck head designed to build torque, not horse power. These heads will fall on their face at 4000."

Hmmm, doesn't sound pretty. 195cc intake ports would be expected to do a good job on a 383 cubic inch small block.
Just found a set of these heads 3931063 with manley stanless 2.19 1.88 valves. The guy wants $500 for em. There closed chamber head and oval port but used in high hp engines. These have got to be better than the 10114156 heads i did all the port work to rite??? Are they worth buying and selling my other ones?

That post is rite on at around 3500 rpm those heads fall flat, ive been having that problem and it ran better when i shifted manualy.