ZL1 Chevelle Intake Swap - Six Shooter Shoot Out

We Put Barry Grant's Big Block 3x2 Setup To The Test On A Odern Zl-1.

Barry Kluczyk Nov 1, 2007 0 Comment(s)
Sucp_0711_11_z Zl1_chevelle_intake_swap Four_barrel_removal 1/23

With the distributor removed, and the fuel lines and temperature sensors disconnected, the four-barrel setup was lifted up and out of the engine compartment.

Finally, we were left wanting more from the instruction guide included with the kit. It's up to the installer to deal with the throttle cable/rod-to-carb linkage connection. It took more than a little time to modify the car's existing cable so that the connection allowed for wide-open throttle when needed.

Once the intake was installed, the linkage adjusted, and the timing set, it was back to the dyno where we were greeted by a foul smell and a 40hp loss. Yikes!

Of course, you'll have that when you, ahem, run the test car out of fuel on the dyno's rollers. Luckily, we were able to siphon some fuel out of Hardcore's racing supply and we were back to making full pulls.

Initial tests with the intake and no further tuning netted-surprise, surprise-a 3hp gain. But the air/fuel graph showed there was room for adjustment. Timing was adjusted to 38 and the engine responded with a noticeable gain. Final tuning adjustments delivered a total rear-wheel output of 358 hp and 376 lb-ft of torque. That's 15 more horses and 28 more lb-ft torque, or approximately 5 percent more horsepower and 8 percent more torque-not to shabby for a simple intake swap, we think.

The Six Shooter performed better than our initial expectations and definitely gives this big-block A-body a unique underhood appearance. This "shooter" hits the mark.

Sources

Hardcore Racing
Montclair, CA
909-851-8251
Barry Grant Inc.
Dahlonega, GA 30533

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