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Re: HEI Ignition Problem
I am thinking it is your timing... how many miles does the truck have?
This sounds very similar to my trucks old 350 that the po installed. The motor only had 60k on it and it stretched the chain enough to do her in.
The timing chain skipped a tooth and did the exact same thing that you said....running hot, poor performance when warmed up, and no power under a load... Now that I am thinking more into all of your posts here, it is very possible. All of your symptoms are on key with timing problems.
Something to consider.
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