Correct coil for '70 LT1?

**YENKO DEUCE REGISTRY** · #1 01-29-2009, 10:06 PM

Schoneye is correct, the LT1's in Deuces were all 293's.

**mockingbird812** · #2 01-29-2009, 11:52 PM

Any thots Marlin on why 293s for the LT1s in Deuces and 270s for LT1s in Zs and vettes?

**Salvatore** · #3 01-30-2009, 12:20 AM

Sam, those numbers are for the use of the assembly line workers to put the correct coil bracket on the correct car for hood clearance and air cleaner clearance etc I believe. I think there were maybe 3 different types of bracket angles. The 69 Z/28's took a 298 coil. Same as the 293 but that number determined the bracket offset. The guys at the CRG Site or maybe Jerry MacNeish or Brian Henderson can explain it better.

**mockingbird812** · #4 01-30-2009, 12:22 AM

So Sam, you're saying that maybe the Deuces had different (more) hood clearance than the vettes and Zs and the 293 or 270 would dictate the bracket angle thereby providing appropriate clearance?

**Salvatore** · #5 01-30-2009, 01:03 AM

Believe me Sam, I am NO expert but I think that would be correct. The coils 293 and 298 I believe have the same ratings. I am not sure if the 270 coil is a hair shorter than the others or not. My 69 SS nova has the 293 coil on it. My Z has the 298 coil with the flat hood.

**Mr70** · #6 01-30-2009, 05:40 AM

I don't think that's right.
Embossed ignition coil numbers were not calling out the bracket offset for the vehicle they were going into,but rather an abbreviation for the last 3 digits of the actual Delco full seven digit part #.
In general,what set coils apart was the difference in the resistance wire they were wrapped with internally.
#202 coils measured 1.8 OHMs,#238 coils measured 1.3 OHMs,etc.

Chevrolet did use different coil mounting brackets w/varying angles,so using the examples above:
A 1969 Nova SS used a #1970344 coil mounting bracket.
A 1969 Camaro Z/28 w/flat hood used a #1971011 bracket.
A 1969 Camaro Z/28 w/Cowl Ind. hood used a #1966876 bracket.
I've yet to see a coil body reflecting anything close to the above bracket numbers,but would like to hear from anyone who has.

Why the application difference between a #270 vs. #293 vs. #298 on essentially the same engine may have had something to do with static interference,(mast antenna vs. one imbedded in the windshield which began in 1970),or even an overheat issue in a specific vehicles engine bay,or something as miniscule as using up old inventory for a newly designed coil.
I'm trying to learn too..

**Salvatore** · #7 01-30-2009, 05:45 AM

Keep me straight Rick!

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