Anyone put 1.85 or 1.80 RRs in a 5.3?
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Anyone put 1.85 or 1.80 RRs in a 5.3?
Wondering if anyone has put these RRs in a 5.3 and tested them? LS1.com has 2 threads. One gained 9 h.p. and the other lost 13 . He got it back when he put the 1.7s back in.
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I don't see how you could lose that much hp. They probably didn't set the valve lash right or something. 9hp gain seems realistic. I've never messed with them on LSx engines, but with my Camaro, and gen 1 SBC's you typically see 1.5-2mph gain in the 1/4, which is about 10-20hp (rough estimate) most likely 10-15hp with our trucks.
IMO if you don't have a cam, then do that, because it would be more cost/performance effective. You'll get more lift/duration, and better lobe profiles/ramp rates with an aftermarket cam than you would with 1.8's. I'll probably be about the same price too. JMO.
IMO if you don't have a cam, then do that, because it would be more cost/performance effective. You'll get more lift/duration, and better lobe profiles/ramp rates with an aftermarket cam than you would with 1.8's. I'll probably be about the same price too. JMO.
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Originally Posted by vanillagorilla
IMO if you don't have a cam, then do that, because it would be more cost/performance effective. You'll get more lift/duration, and better lobe profiles/ramp rates with an aftermarket cam than you would with 1.8's. I'll probably be about the same price too. JMO.
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