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Old 07-17-2015, 01:00 PM   #3
centuryhouse
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Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350

Quote:
Originally Posted by Mike C View Post
Take plug out. Read number and manufacturer of plug. Cross reference #. Looks like a later model crate motor with passenger side dipstick. Has 12si alternator conversion as well in addition to the long water pump and flipped alternator installation.
I considered just using the old plug type, but since it seemed the PO rigged so many things, I wanted to get the right one, not just the one he used.

If I Googled correctly, it looks like the 12si is a later model alternator and puts out a little more?
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