Series 1,11,111
Thread Starter
Drifting
Joined: Apr 2001
Posts: 1,779
Likes: 6
From: LOS ANGELES CA.
Series 1,11,111
Can anybody explain the differences in the Series 1,2,3 heads.I've read about cars having the diffrent heads installed on them,but I don't recall ever reading about the differences in the heads.Thanks in advance.---Rod 
Pro
Joined: Jul 2002
Posts: 525
Likes: 0
Do you mean stage I, II, III???
Stage I, basic port job, stock valve, general clean up, stock springs etc.
StageII, full porting and polish, new bigger valves, new springs, retainers, etc., milled for compr.
Stage III same as stage II, generally opened up comb. chamber for big bore engine.
These are generic examples, every head porter will have different options or stages and whats included in each.
Did'nt you just get stage II heads put on?
Stage I, basic port job, stock valve, general clean up, stock springs etc.
StageII, full porting and polish, new bigger valves, new springs, retainers, etc., milled for compr.
Stage III same as stage II, generally opened up comb. chamber for big bore engine.
These are generic examples, every head porter will have different options or stages and whats included in each.
Did'nt you just get stage II heads put on?
Safety Car
Joined: Nov 2003
Posts: 4,979
Likes: 5
From: San Diego, CA "leaf" "tee" "e"
If you're talking about the different types of heads that GM put on LS series engines, then go to the C5 General Sticky and read the following threads:
Jerami's SuperFAQ....
GM head Guide
421 & 853 casting....
If you're still having fun, read:
Cylinder Head Discussion
Jerami's SuperFAQ....
GM head Guide
421 & 853 casting....
If you're still having fun, read:
Cylinder Head Discussion
