Generation IV Internal Engine - Are these heads/intake from an 8.1 or ls7???

05-10-2006, 06:12 PM
here is a link to the pictures. what blocks will these heads/intake fit?

05-10-2006, 07:47 PM
looks like 8.1 to me...

05-10-2006, 08:09 PM
definitely 8.1L

05-10-2006, 09:05 PM
what block(s) will these heads fit? will they only fit an 8.1?

05-10-2006, 09:28 PM
Yeah they will only fit the 8.1 because it is the "big block" of today. It's the only one of its size that I know of.

05-10-2006, 09:28 PM
I would assume only 8.1's. They are big block heads aren't they?

05-10-2006, 11:46 PM
yes, they are big block heads. when i bought them i was told that they would fit any big block that was 91-up. but it seems that this is not the case??

05-11-2006, 07:10 AM
The 8.1 has been around a while, I dont think those will fit a 454 though and thats what was used early 90's, but they will fit any late model big block, the key phrase is big block

05-11-2006, 01:01 PM
Are there any places I can get info on the 8.1?
Is it based off the Gen 3/4 design, or it more based upon the original BBC?
It would be amazing if they had Gen 3/4 architecture(6 bolt mains, firing order...).

05-11-2006, 04:27 PM
I believe the 8.1 is GEN III stuff.

05-11-2006, 05:49 PM
The 8.1's don't really have anything in common with Gen IIIs or Gen IVs

05-11-2006, 06:20 PM
head design is similiar, it shares common design trends

05-11-2006, 06:31 PM
The design trends stop at the intake port!!!

05-11-2006, 09:59 PM
It ain't 454 bolt on so what would you call it? It's the next generation as far as big block stuff goes.

Willem @ Fuel Injection Concepts
05-12-2006, 12:39 AM
its the gen III big block.. it has about as much in common with the LS1s as the SBC have in common with the BBC.