I'm looking at the stock replacement motor for 96+ 8600GVW trucks. Like skylark said it has roller valvetrain.
On mine i'll be using a L31 GM Performance Crate, Edelbrock Performer Vortec style intake, Headers, Edelbrock Performer and MSD ignition products w/ Delco Plugs.. I think it will give me the reliability of a 350, and being brand new, won't be a dog in contrast to the 6.5.
I think that combination would really be a signficant power increase over your 305...
On mine i'll be using a L31 GM Performance Crate, Edelbrock Performer Vortec style intake, Headers, Edelbrock Performer and MSD ignition products w/ Delco Plugs.. I think it will give me the reliability of a 350, and being brand new, won't be a dog in contrast to the 6.5.
I think that combination would really be a signficant power increase over your 305...