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Old 10-18-2019, 01:14 AM   #94
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Join Date: Oct 2014
Location: Ocean Springs, MS
Posts: 41
Re: 77 c10 5.3ls turbo (Dyno numbers) my math that's about 660HP at the flywheel!
Pretty dang good, I'd say!

Originally Posted by jrpontiac View Post
Good news - Had the truck dyno’d. Running about 12.5 lbs

Bad news - it was making some lifter noise before the Dyno. I think one lifter has let go. Will pull the heads and inspect. If lower end looks good probably will upgrade heads/arp head bolts and a couple other things. If it is a piston problem I’ll scrap the 5.3 and build a 6.0 and shoot for 700 hp.
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