I hate to even put this up here but I'm still using the same OEM 990 module that showed up in my HEI back in the mid-1970's.
Over the years I've tried several other "bug zapping" varieties and even the Mallory module they sold for a while with the adjustable rev-limiter in it.
ALL of the aftermarket modules took a chit after moderate use so I put the OEM 990 module back in and it's still working fine today.........now that I've said that the darned thing will probably crap out tomorrow!......LOL....
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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