Looking for DYNO results on a stock 1969 L78

[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

[Keith Tedford]

Has anyone ever done a back to back comparison of the 569 and 163 intakes. I have a feeling that there wouldn't be as much difference as people might think, especially in the rpm range that these engines work best. People wouldn't believe that the rectangular port intake would work on oval port heads. Seems to just fine. Just curious.

[markjohnson]

I've got an old magazine with a feature of an NHRA Stock Eliminator LS-6 Chevelle and I was quite surprised to hear them say that back-to-back the '569' pancake was about the same as the '163' high-rise manifold. Now this was with stock camshaft specs and they stated that with a more radical cam and a higher RPM range that the '163' would probably surpass it.

[TXSS]

The stock built L78 in my Pace Car dynoed in the 380's through headers, no smog, no special tuning or jetting.

My stock L72 427, same deal dynoed at 436hp @ 5900 440 tq @ 4100