I hate dealing with ignition issues - especially on 40 year old resto mods. I could see problems with my original HEI and tried to fix what turned out to be worn out. I read the reviews and comments about this HEI device and gave it a try. Luckily surprised - the reviews are correct - it works right out of the box. - Synchronization and feed, both mechanical and vacuum, worked correctly. I really had to install a faucet vacuum advance limiter as the total advance was 42 degrees and I needed to stay closer to 36 overall. Great product so far. UPDATE: 6 months later = Module died and got stuck with me - luckily I was close to home.
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