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The point I was trying to get at is a $3500 after market block, a $2000 Callies crank, $1200 Aluminum rods, $4000+ heads, isn't required for 650 hp. Sure, you can dump $15K+++ in the project if you want, but it really isn't needed.

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That is definetly true. But I dont think I would want to push a stock block much more the 650 hp. I would say my 493 is pushing about 600 to 610 hp and so far no problems at all with my stock block. Ron

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Brian
It started getting a bit rich in the top end looking at the A/F and BSFC, there could of been a little more power there.

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I think because of the non adjustable rockers, and having about .050 depression on the lifter plunger, we were seeing some lifter pump up causing erratic #'s.
For sure, with different rockers power could go up a fair amount. I thought the TQ curve was pretty good as well as the wide powerband for such a short stroke.

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I agree,the heavy stock sized valves tend to keep a hydraulic cam from working well at higher rpm's unless everything is just right.
As for leaning it out on the top end for more power,that does not always work out so well. I have spent a lot of time getting a flat A/F across the board before just to find that the engine wanted the extra fuel. It depends on the fuel used and how the engine combo is working with it.
I have also tried it at the track to see how the results from the dyno pan out. I have had to go back to the richer settings on the top end to get the mph back up. Many variables come into play!

Keith

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