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killer_datsun
12-08-2005, 07:54 PM
is there any simmilarities between the 6.0 and smaller engines and the 8.1 like can we use parts on the 8.1 that were made for the 5.7??

Travis B
12-09-2005, 01:21 PM
I know that parts on the 5.3 5.7 6.0 will interchange as far as the 4.8 and 8.1 I have no idea but I would assume that they would :dunno:

Ralph LoGrasso
12-09-2005, 01:24 PM
I'm pretty sure the parts on the 4.8 and 8.1 will not interchange, but I may be wrong? As Travis said, 5.3, 5.7, 6.0 are mostly all interchangeable.

nitrovette
12-09-2005, 04:03 PM
some parts will interchange with the 4.8 also, its the same block as the 5.3 with different stroke.all the timing covers,valve covers,rear covers intakes and oil pans will interchange,the waterpumps are different because of the top inlet from truck 4.8 and 5.3 to ls1 5.7's.

http://www.ls1tech.com/forums/showpost.php?p=1740882&postcount=4

killer_datsun
12-09-2005, 07:25 PM
so by that I could use pratically any part made for the 5.7 on the 8.1 such as the Fast LSX intake manifold

rocketman
12-09-2005, 09:33 PM
8.1 (502)is a big block ,the rest are small blocks

nitrovette
12-10-2005, 05:18 AM
yeah the 8.1 is different like he said only the 4.8,5.3,5.7 and 6.0 will interchange most parts not all.

killer_datsun
12-10-2005, 03:08 PM
I know it is a big block, it is a gen 3 like the ls1 variety or is it a just different enough it being a big block so the intake manifold and stuff like that won't interchange

nitrovette
12-10-2005, 03:37 PM
Heres a 8.1 looking at it you can tell nothing looks the same as a lsx type motor.I doubt the intake will swap over.

http://cgi.ebay.com/ebaymotors/2001-8-1-L-Chev-Conplete-Engine-Conputer-and-More_W0QQitemZ8021146296QQcategoryZ33615QQrdZ1QQcm dZViewItem

killer_datsun
12-10-2005, 03:55 PM
thanks nitrovette it appears to me that the 8.1L is a gen 2 big block, so it appears the 8.1 and 6.0 are two totally different engines

andrewb70
12-11-2005, 07:09 AM
thanks nitrovette it appears to me that the 8.1L is a gen 2 big block, so it appears the 8.1 and 6.0 are two totally different engines

Correct.

Andrew