340 Engine Shake

trapster said

If your engine was still together I would suggest trying it without the spacer and with more spacers to see if it made any difference in the running of the engine.

PS. I am also interested because I am adding a fitech to my 340, and I am hoping to avoid such issues. I have an airgap, a Torker and Torker 2, plus the original iron dual plane that barely fits under the hood with the carb.

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The engine is not together, it's torn down to figure out where the glitter was coming from. I still have to take the crank and pistons out and check the mains.

All that being said. I researched the heck out of Fitech back in 2017, when I bought it. I feel like I avoided all the common mistakes with emi interference, grounding, replacing the faulty coolant sensor that comes with the unit, etc. So I already had the air gap and added a one inch open spacer. I've heard of guys also miling the center divider. There are a few threads on here if you search Fitech. One of them is a tuning thread that has a lot of great information. Also, Google and you will find another from a Chevelle forum. These are great because they were created when Fitech was fairly new.

All that being said, if I could do it over, I probably would've went with the Edelbrock PRO FLO 4 port injection. But just a matter of opinion. The Fitech so far has really been great. I do not believe the trouble I was having was in my tune, but time will tell.