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28* is too much IMO. Anything over 24 for a street truck and you sacrifice way too much on the bottom for the minimal gains up top. Again, that is just my opinion. Our 2.5 truck made more power with 28* but we ran it at 24* on the track and it consistently had more usable power and it was easier on the pistons. We carried 4000 down the track with no issues at all.
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2015 half ton heavy chevy
81 Fairmont LS project
Many yard ornament projects...
North American Turbo
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