Part Decoding

Echlin is a division/brand of NAPA/Echlin and that part # is an ignition module (by the looks of the part #).

Echlin is in business for the purposes of supplying NAPA auto parts stores. Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going.... '91 S10 Blazer 4.3Z

would that be the 'transistor switch' part of the distributor, similar to the black plastic lump found in the older HEI distributors by any chance ??

where would it live in a LT1 ?

I'm just curious to know what they actually changed,

Thanks again

Possibly. Go on Echlin's website and have a look. Or ask the shop that did the work to explain it to you.

They charged you, they should explain what they did and why :).

Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going.... '91 S10 Blazer 4.3Z