Horsepower difference ?

[WARP TEN]

Originally Posted by Hib Halverson

>Mild port/polish on intake and exhaust ports.
>better blending of the ports just above the valve seats
>Three-angle valve seats
>"Sleeve spacer" between the head and injector housings to improve alignment
>Revised cam timing but cam profiles remained the same
>Revised calibration
>New exhaust manifolds...which actually cost 5-hp but went to production to solve a problem with the engine ingesting debris if the cat converter substrate failed at high rpm.

Always glad to have your wisdom around, Hib. I had forgotten all the details and especially about the cat debris ingesting problem. --Bob

[Hib Halverson]

Originally Posted by WARP TEN

Always glad to have your wisdom around, Hib. I had forgotten all the details and especially about the cat debris ingesting problem. --Bob

Some of that info came from GM press info that was distributed in the 1993 long lead book.


The rest of it came from a conversation I had many years ago with Graham B.