That truck is cool! Put a nice paint job on it, it deserves it.
How'd she do?
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I highly suggest lowering timing and seeing what it does. What pistons are in it? Really should work with higher rpms if it keeps falling off
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You can make an 88 work. It’s not that hard. You could be on the wrong side of timing. To high and they fall off. Without being on a dyno and seeing what it does it’s Hard to tell. At 42* mine was still making power but the gains at peak were less. Even if it’s not making peak you can Still make good power shifting at 5000+ letting it shift down into peak power staying on the turbo.
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Saw your vid you sent last night, safe to say going down to the 475 was a good move. Congrats, glad to see you making big improvements.