GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat - Should I change the size of engine

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GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat (https://www.gmforum.com/)

- Oldsmobile (https://www.gmforum.com/oldsmobile-171/)

- - Should I change the size of engine (https://www.gmforum.com/oldsmobile-171/should-i-change-size-engine-311533/)

Tech II

Apr 9, 2018 05:55 PM

Are you trying to put 3800 heads on a 3.4?

Mike	Apr 11, 2018 05:47 AM

Quote:

Originally Posted by Tech II (Post 1626524)

Are you trying to put 3800 heads on a 3.4?

They'll fit, just JB Weld them on with red Loctite.

Mattyhewson25

Jun 5, 2018 10:28 PM

Welp I kinda decided plug an play will he the way to go for now. So the question I have now is would a late 1999 3.4/3400 SFI work in place of a 1994 3.4 DOHC. Plus what is the difference? I can only think of the computer having to be programmed slightly, but that's it. Insight?

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