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HEI module

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lightning boy:
Does anyone know the best module for a 4pin HEI? Brand and Part

Cliff Ruggles:
OEM "990" modules are the best.  I've seen a few show up on Ebay NOS.  They are light years better than anything else out there.  If I needed one I'd dig it out of any old distributor vs buying anything new or aftermarket.....FWIW

lightning boy:
Thanks Cliff.

Cliff Ruggles:
To date I've tested just about every "upgrade" for the stock HEI module.  Even one with rev-limiting dip switches on it. 

Some worked fine, others did not.  Without exception, sooner or later every single aftermarket module bit the dust and I had to go back to my 990 module.

On the dyno my "stock" HEI with 990 module made just a tad more power in a back to back test than an MSD billet distributor with a 6AL box!......

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