What do you think?Īs far as the cam is concerned, I have discovered that the PerformaBuilt Torque converter stall speed is between 12 rpm. For the increase in price, less than $300, it would seem like a no brainer to go with the E- Street heads. If I get the E -Street all the spring and valve work is done and Edelbrock Performer manifold on it now will and the valve covers on it now will work. I also would need a different manifold and valve covers. I think there is also another milling job to be done on the guides. I have read that to run the Vortec I need to install bigger springs, drill out the pushrod holes and tap the rocker stud holes for threaded rocker studs. I think I will go with another set of heads and a cam. Pulsed controllers or staged nitrous systems offer the same kind of protection.All your comments have caused me to rethink things. We felt those cast ring lands might fail with this much torque at a lower engine speed, so we elected to delay the nitrous until 5,000 rpm. That same torque gain at 3,500 rpm would kick it up to almost 550 lb-ft.
That doesn't show up in this test, but if you look at the torque increase at 5,200 rpm, you'll see there's an additional 200 lb-ft that generate the additional horsepower.
The advantage with nitrous flowing through a fixed orifice is that the same amount of nitrous at a lower rpm generates a tremendous increase in torque. You'll note that we didn't hit the nitrous until over 5,000 rpm, as we were only interested in a peak horsepower number. All that paid off with a very successful 520hp number. This required a simple swap to 0.082 fuel and nitrous jets with the timing yanked back to 24 degrees. This left us only 18 shy of our 500hp goal, and after a discussion with Westech's Steve Brul we felt brave enough to hit it with a full 200 shot. On our first pull, the 150hp tune netted exactly that with a 482hp peak.
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