Hurley00

iTrader: (3)

Ive read on here that the reason the new 4.8 5.3 trucks run so good is because theyre running the z06 heads (not sure of the casting #) from the dealer. Would these heads fit a 2000 4.8? Would it be worth it or should i look into some from patriot or someone else. This is just an idea. Thanks Guys.

GMCtrk

iTrader: (27)

get them milled to 58cc's while your at it and it would be a worthiwhile swap

Hurley00

iTrader: (3)

Any certain casting number? Of course I guess id have to go ahead and get the intake and throttle body too and if im not mistaken its a 90mm TB.

GMCtrk

iTrader: (27)

799/243

Hurley00

iTrader: (3)

Thanks, actually this might be going on a 01 5.3 that im getting. Are the L92 heads too much for the 4.8 and 5.3?

GMCtrk

iTrader: (27)

They require a 4" bore.

Hurley00

iTrader: (3)

yeah i remember seeing that on here. Has anyone swapped the newer heads and intake on their trucks yet?

Hurley00

iTrader: (3)

The 5.3 that getting has 862 heads on it and i was wondering if these are good heads or not.

mcfarlnd

iTrader: (15)

706s and 862s are the same besides one has a smoother casting.