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Old 01-27-2021, 09:01 PM   #1
Flannel-On-A-Camel's Avatar
Drives: ‘15 RH Z/28 #185, Hennessey #006
Join Date: Aug 2019
Location: Kansas
Posts: 42


What are your experiences going past 650 hp N/A? The ol' girl is making every bit of 650hp, which I believe is pushing the limit for being "reliably modded", if such a thing exists. Of course, it wouldn't hurt my feelings to have 50 more hp...

Really, I'm trying to look at this wholistically, keeping the reliability of the whole powertrain in mind, not just the engine.

For context: performance cam and valvetrain, ported factory heads, full exhaust, stock intake, tb, injectors, and fuel pump.
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Old 01-30-2021, 12:29 PM   #2
Gary B
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Drives: Subaru
Join Date: Oct 2008
Location: Ct.
Posts: 571
Look at Race Proven Motorsports videos on Youtube. I think the highest they've seen is like 626 rwhp. Probably a little more left but you would have to experiment.
Time for a new ride soon....6th Gen or 5th Gen Z28? Hmmm....
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Old 02-01-2021, 01:49 PM   #3

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Drives: '94 Z28+ '15 Z/28
Join Date: Jun 2009
Location: Cheektowaga, NY
Posts: 1,153
There's plenty of recipes out there to hit a big number N/A. Whether or not it will be streetable and reliable enough to not need constant valvetrain checking is another thing. Remember that certain COPO 5th gens came with 427's. Last I heard they were making North of 900hp. Granted thats crazy compression, race gas only, etc. You'd have to talk with a valvetrain expert. Someone that does that for a living. They could get you into the 700rwhp area but it won't be cheap.
'94 Z28, 414" LT1, 10.15 at 133.65 N/A pump gas
'15 Z/28 Red Hot, A/C
1980 Z28- resto-mod project
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