Jim Smart
April 27, 2010

Dyno Pull 2
Holley 4150 (0-80513-1), 1000cfm
0.85/0.85 Jet Change
12.54:1 Compression
2-inch x 30-inch x 3 1/2-inch Hooker Headers
36 Degrees

RPM HP Torque
4,000 399.8 524.9
4,500 466.1 544.0
5,000 514.4 540.3
5,500 543.2 518.7
6,000 552.3 483.5
6,500 543.0 438.7
7,000 524.6 393.6

This jet change didn't accomplish much with only a slight gain in horsepower and loss of torque.

Dyno Pull 3
We're going to try out the 1,000cfm Holley 4150 (PN 0-80514-1) PC Series carburetor from Performance Carburetors. Although the Holley 0-80514-1 has annular boosters from Holley, Performance Carburetors fits it with down-leg boosters, screw-in air bleeds, high-flow needles and seats, custom billet metering blocks, non-stick gaskets, polished and flowed venturis, float bowl sight plugs, drag float extensions; longer bowl vent tubes, and a special CNC machining technique to perfect the surfaces. Pricing is just under $800 out of the box. For custom tuning to your application, add another $50. Here's what happened on the dyno with our PC Series carburetor.

Performance Carburetors PC Series 4150, 1,000cfm
0.93/0.93 Jetting
12.54:1 Compression
2-inch x 30-inch x 3 1/2-inch Hooker Headers
36 Degrees BTDC Total

RPM HP Torque
4,000 400.2 525.4
4,500 467.3 545.4
5,000 518.7 544.9
5,500 548.9 524.2
6,000 554.5 485.4
6,500 552.8 446.6
7,000 531.6 398.8

What's it cost?
We're not going to kid around, this is an all-out road race engine build. The total cost of parts, machining, and assembly put this bad boy just north of $15,000. A street engine would be easier on the wallet.

Dyno Pull 4
We've gone back to the Holley 4150 (0-81513-1) carburetor with 0.85/0.85 jetting, which yielded a near-perfect fuel mixture and consistent numbers. Team MCE has chosen to check valve lash in the wake of three pulls to see what it does for performance. Ignition timing remains the same.

Holley 4150 (0-80513-1), 1,000cfm
0.85/0.85 Jetting
12.54:1 Compression
2-inch x 30-inch x 31/2-inch Hooker Headers
36 Degrees BTDC Total Ignition Timing

RPM HP Torque
4,000 389.7 511.7
4,500 460.6 537.6
5,000 515.0 540.9
5,500 546.9 522.3
6,000 561.8 491.8
6,500 560.1 452.6
7,000 546.2 410.2

Sometimes, it isn't the big things you do, but the little things that gain power. When Team MCE performed a valve adjustment, it gained 9.5 horsepower and moved torque higher in the power band-losing torque in the process. Marvin will tell you engine planning and building are a series of trade-offs. If you want more horsepower, you're going to sacrifice some torque. And if you want torque, you're going to give up horsepower at a given rpm.

The message here is simple. There are no free lunches in the world of engine building. The 427W Raptor is a racing engine, although you could install it in your Main Street Saturday night cruiser for weekend fun. The catch, of course, is this engine's compression ratio of 12.54:1 along with a 1,000cfm carburetor. Forget pump gas unless you have a buddy who works at the airport or local dragstrip. And if you pump it into a street ride, you're illegal thanks to tough environmental laws.

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