Gen IV to SM465 in a K5 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jays68yak · 11-09-2011, 01:35 AM

Not to bring up an old thread...but only cuz I came by this in a search. Ive done several 8.1 swaps in my personal trucks. For the one that has a sm465 behind it I got a stock 427 flywheel. Since those were internally balanced like the 8.1 is. The flywheel was something like $30 at kragen. Used the same clutch plate and pressure plate I had behind my 454. No issues 2 years later. The 8.1 is different from the 4.8/6.0 and other LS series engines. It doesnt have a lot of the changes that they do, IE crank offset and what not. Just thought I would toss out my 2 cents.

11-09-2011, 01:35 AM	#8
jays68yak Registered User Join Date: Oct 2002 Location: Gilroy, CA Posts: 1,454	Re: Gen IV to SM465 in a K5 Not to bring up an old thread...but only cuz I came by this in a search. Ive done several 8.1 swaps in my personal trucks. For the one that has a sm465 behind it I got a stock 427 flywheel. Since those were internally balanced like the 8.1 is. The flywheel was something like $30 at kragen. Used the same clutch plate and pressure plate I had behind my 454. No issues 2 years later. The 8.1 is different from the 4.8/6.0 and other LS series engines. It doesnt have a lot of the changes that they do, IE crank offset and what not. Just thought I would toss out my 2 cents. __________________ 1969 Chevy Project SWB Fleet, 20s, 5.3, t56, in the weeds. 1970 Chevy Truck cab on a 1979 Jimmy frame-8.1 liter 496 bbc/sm465/np203-jeds doubler-np205/d60/14bff Welded/42 tsls on recentered H1s 1998 Chevy Crew Cab K3500 SAS'd with hpd60, links and swayaway coilovers. 8.1l vortec DD/towrig "I like long walks, especially when they are taken by people who annoy me. "

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