hey i have aset of lb9 heads 5.0 tpi heads and i wanna to know the specs on the vavles?and cc?exc?and what are thespecs on the lo3 heads 5.0 tbi?i going to do this swap and i ned to know

 

Um the LB9 heads are 58cc heads, 160 intake(i think?), dunno exhaust, Valves are 1.84/1.5. Dont know about the springs.

L03 heads suck and if you had a set of LB9 heads on you, i sugest porting them and swaping them on for a cheap fix.

 

thr LB9 heads will give ya alot over those LO3 heads, port them and give those heads some 1.94" valves w/ some new spring and you'll pick up a nice amount of ponies.

 

my motor has bad vavle seals the lo3 so i have a lb9 motor so i have the heads so im going to send those to rebuilt and then put them on/the lb9 heads have bigger vavles then the lo3's correct?im going to put a 355 nexy year in it so i dont want the 1.94 vavles yet but thanks for help how much power will i gain putting the lb9 heads the edelbrock performer and lt1 cam?

 

maybe 15hp w/ no mods to them at all. if ya do a little bit of porting, the new valves and the rebuild your looking at around 25hp
so my guess is being somewhere around 225hp w/ mos bolts too. but i'm reall only a TI guy so i'm not saying that i'm exactly right.

 

What would happen with LB9 heads fitted with 1.94 valves up top a ZZ4 block?

 

just the putting in valves? It would give it some performance.. but with the small chamber you could get some detonation. The ZZ4 comes with aluminim vette heads with basicly everything the LB9 has, only larger intake and exhaust ports and larger intake valve.

 

the zz4 uses 58 c chambers too

erm,forgot about the iron vs aluminum thing :lala:

 

yeah... the small chamber on the lb9 heads might not work to well for higher compression... thats why GM went with aluminum for the vette heads... I can only think...Im not sure. Sounds logical.