Gen-I SBC upgrade from '882 heads to '062 L-31 Vortecs - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-29-2010, 02:39 PM
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Gen-I SBC upgrade from '882 heads to '062 L-31 Vortecs

Has anyone out there upgraded their Gen-I SBC from the old '882 castings emmissions heads to GMPP L31 Vortecs ( '062 castings ) ?
A couple of things that no one ever mentioned, and that I haven't read in any of the 480 or so postings I've read about this type of conversion: The temp sender is not the same size as the original 882 temp sender hole on the L-31's - It's 3/8" npt.
I did find out after the fact from SDPC tech that "oh, yea, everyone makes the L-31 temp sender fitting the same size as the '882 head sender"
Too bad I've got the heads, manifold and everything else installed now.
Anyone have any idea on a temp sender that will work with the original 1977 chevy temp gauge
and will fit in the L-31 smaller hole ?
I measured both senders with a resistance meter. The original sender reads 500 ohms and the new generic temp sender for the L-31 application engine ( 1996 ) measures 2000 ohms. The new one is also designed to work with an ecm module.
The second problem I've foundi that the original transmission TV cable bracket will not mount on the GMPP vortec style intake manifold. Holes don't line up and the new mounting point would not line up the TV cable with the carb linkage. ( Holley 750 cfm / 4160 carb )
Any help with these two items would be greatly appreciated.

Last edited by redbeast1; 03-29-2010 at 03:18 PM.
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Old 03-29-2010, 05:23 PM
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there is an equivalent sender in 3/8npt. check in the Standard Motor Products illustrated parts guide, it has dimensional and operational info on all their parts.

you can get a bracket from TCI that will locate the TV cable off the carb flange.
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