[wyldwest]

hey! anybody have any experience with new GM engines installing in pre 60's vehicles, how about which aftermarket wiring harness? any info. would be much appreciated!

 

[61Burb]

Gen III conversions

It sounds like the same project I'm looking at.This is what I have come up with
*the overall length is 24 " 1 " less than a small block chevy
*harness available from Painless $500 + use OE ECM
*great availability
*carb intakes are available from FAST
*bellhousing is the same as a small block so transmission option are the sky
*4.8/5.3 are aluminum head cast iron blocks
*5.7 LS 1 are aluminum head and block
*6.0 can be cast iron heads or aluminum.WARNING the aluminum heads on the 6.0 drop valve seats on a regular basis.Cause is due to not enough press fit on the seat OE .002 need around .006
* last the early 1999-2000 GEN III engines have bulletins in regaurds to piston slap due to the short piston skirts.The later years graphite coated the skirts to eliminate noise.So I would shoot for a later application.Some of these also have electric throttle control .As in no cable .I don't know if this harness is availableas of yet.I'm going to use the OE harness.Good Luck

 

[the1fordirt]

hey! anybody have any experience with new GM engines installing in pre 60's vehicles, how about which aftermarket wiring harness? any info. would be much appreciated!

Better checkout the bellhousings the newer motors have top center bolt not saying they won't bolt up but-----

 

[61Burb]

Bellhousing

Trust me the bellhousing pattern .We mocked it up on a line boring machine and the fixture is the same as any old SMB Chevy 1955-2000

 

[68c10owner]

www.ls1tech.com

They have a hybrid/swap forum with alot of great info.