Replace a 6 cylinder with a V8 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steve75104 · 10-25-2004, 09:27 PM

How difficult of a job is this replacement? Any tricks or cotchas I should be aware of? Thanks!!

steve75104 · 10-25-2004, 10:15 PM

Is that an issue or will I have to replace the transmission as well?

Tx Firefighter · 10-25-2004, 11:19 PM

The 6 cylinder and the V8 share the same bellhousing pattern.

Honestly, there are several ways to skin this cat, depending on how anal you are.

The easy way is to set the V8 right in on the 6 cylinder mounts and use long water pump accesories, which are real common and cheap.

The harder way, but technically more stock and correct, is to use V8 frame mounts and short water pump accesories.

You may find a search very helpful, as plenty has been written on here about this same thing.

If your search doesn't asnwer your questions, ask, and we'll help you with them.

I've personally done several inline 6 to V8 swaps, including my most current project.

68w/sbc406 · 10-25-2004, 11:41 PM

not too hard. i did it and i had a 4 speed. the hardest thing was finding the auto crossmember i wanted with the 2 reliefs for exhaust and cleaning everything so it wasnt crusty

10-25-2004, 09:27 PM	#1
steve75104 Another 69-20 years later Join Date: Oct 2004 Location: Cedar Hill, TX Posts: 94	Replace a 6 cylinder with a V8 How difficult of a job is this replacement? Any tricks or cotchas I should be aware of? Thanks!!

10-25-2004, 10:15 PM	#2
steve75104 Another 69-20 years later Join Date: Oct 2004 Location: Cedar Hill, TX Posts: 94	BTW, the existing 6 is an automatic Is that an issue or will I have to replace the transmission as well?

10-25-2004, 11:19 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	The 6 cylinder and the V8 share the same bellhousing pattern. Honestly, there are several ways to skin this cat, depending on how anal you are. The easy way is to set the V8 right in on the 6 cylinder mounts and use long water pump accesories, which are real common and cheap. The harder way, but technically more stock and correct, is to use V8 frame mounts and short water pump accesories. You may find a search very helpful, as plenty has been written on here about this same thing. If your search doesn't asnwer your questions, ask, and we'll help you with them. I've personally done several inline 6 to V8 swaps, including my most current project. __________________ I'm on the Instagram- @Gearhead_Kevin

10-25-2004, 11:41 PM	#4
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	not too hard. i did it and i had a 4 speed. the hardest thing was finding the auto crossmember i wanted with the 2 reliefs for exhaust and cleaning everything so it wasnt crusty __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler



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