Steve Baur
Former Editor, Modified Mustangs & Fords
December 13, 2010

At the higher water temperature, horsepower peaked at 589, while torque came in at 538 lb-ft. This is still quite a bit more than the 550 we had hoped for, so we're doing pretty good at this point. Horsepower junkies that we are, there's probably going to be a power adder on this engine at some point, but Repeat Offender should go low-10s, high-9s on motor alone.

Chris Holbrook told us that there was definitely some power left in the engine, and noted that some additional cylinder head work and port matching could yield another 20-35 horsepower. I if we wanted to see even more, a solid roller camshaft would be the next step.

Perhaps those are some good tech articles for the future. Next month, we plan to make a few front suspension and steering changes, and hopefully drop the engine and transmission in for mock up. Stay tuned.

Note
Ford Racing Performance Parts' Jesse Kershaw also provided us with a set of the company's newly minted Z304 cylinder heads (PN M-6049-Z304PA) that feature a hefty CNC milling all around. With the 2.08-inch-intake/1.60-exhaust valves moving the mixtures through the 427, the FRPP crate engines that use these heads are knocking out a healthy 535 hp with a relatively mild hydraulic roller camshaft.

With the non-CNC head and 2.02-inch valve, the compression ratio is 10.4:1. With the 2.08-inch valve used in the CNC heads, it's 10.5:1 because they take up an additional cc or so in the combustion chamber.

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