Looking for DYNO results on a stock 1969 L78

[Keith Tedford]

Rob, what kind of jetting and advance curve did you run in that factory sloppy stock 427 to make the 425 hp. I know that just getting those two in the ball park made a difference that you could actually feel. 20-25 hp? A friend still has his '69 L78 4 speed Chevy Nova. He told me that he went a best of 12.8s with headers, slicks and tuning. He said he was beating on it pretty hard to get there too. How about some real world experiences here.

[LS6 RAT]

Rob,

I had a '69 Camaro SS convertible L-78 that I had Bob Harris at Camaro Specialties completely restore. I had him send the engine to his engine shop for a complete stock re-build, still at standard bore, this engine complete with A.I.R. system on an engine dyno put down 389 hp in stock configuration.

[Chevy454]

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Rob, are those exhaust manifolds you guys run flowed and worked on some? I heard that rumor somewhere that they were even a little lighter than originals. Thanks!

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Uh, no...that would be the F.A.S.T. (Factory Appearing Stock Tire) class. Our manifolds in Pure Stock must be untouched...we can run a stock reproduction, but they have to be exact copies...and if the repro's are lighter it's news to me...mine are originals, though.

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Rob, what kind of jetting and advance curve did you run in that factory sloppy stock 427 to make the 425 hp. I know that just getting those two in the ball park made a difference that you could actually feel. 20-25 hp? A friend still has his '69 L78 4 speed Chevy Nova. He told me that he went a best of 12.8s with headers, slicks and tuning. He said he was beating on it pretty hard to get there too. How about some real world experiences here.

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Without looking at my notes, I'm gonna guess I had the timing all in by 2500 or so, with total ~37 degrees...jetting was close on the primaries at 73-ish (stock 72/76, iirc) and secondaries 78 I believe? Probably woulda been a *tad* better with my current carb (blocked rear power valve, different jet setup, fresh rebuild from Eric).

[Salvatore]

Got it! I thought you ran that F A S T class. Thanks.

[Chevy454]

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Got it! I thought you ran that F A S T class. Thanks.

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They actually have a Factory Stock (Pure Stock) class at most of the F.A.S.T. events, that uses the same rules as our Pure Stock class, and normally the Pure Stock guys do the tech, so it's pretty much the same faces & rules...but it is definitely confusing!

As for the big hitter F.A.S.T. class itself (Stock Appearing), my plan is to give it a go with my Y-Chevelle...

[PxTx]

I get confused here when people are talking about hp. Are we talking about hp measured at the wheels without any type of drivetrain loss correction factor?

[Chevy454]

I'm speaking in terms of flywheel horsepower, although I have had our L72 Camaro on a chassis dyno as well...

[SBR]

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I'm speaking in terms of flywheel horsepower, although I have had our L72 Camaro on a chassis dyno as well...

[/ QUOTE ] Was the rwhp in the 350 range on the stock build?

[Chevy454]

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I'm speaking in terms of flywheel horsepower, although I have had our L72 Camaro on a chassis dyno as well...

[/ QUOTE ] Was the rwhp in the 350 range on the stock build?

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actually, i believe it was a tick over 370hp @ the wheels...

[JRSully]

a few years ago when I did my 70 L78 motor;dead stock except for: Hooker Comps, recurved orig 2000 distrib, all in @ 3k. Untouched: garbage 569 flat intake,4557 holley (factory jets), 11:1, Block was taken .30, now 408 cu in. It made 422 HP @ 5400 on the dyno. Maybe the extra 12 cubes (over a 396) did a little extra.? although 69 163 intake is MUCH better than the 569 flatty and I was running headers and distrib. My .02