Modified Mustangs & Fords
Ford 331 Cubic Inch Stroker Engine - Going For 400/400 Part 2
We Wrap Up Our Summit Racing/MCE Engines 331 Stealth Stroker, Then Put It On The Dyno For A Little Truth-Telling
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Last month, we began our two-part series on how to get 400 hp and 400 lb-ft of torque from a 331ci stroker small-block fitted with factory Ford iron cylinder heads, and we learned something remarkable during the attempt. You can achieve 400 hp and 400 lb-ft of torque from 331ci and iron cylinder heads without selling the farm.
This month, we wrap up our Summit Racing/MCE Engines 331 Stealth build and show you why we fell a pinch short of 400/400. What's more, we're going to show you how to hit pay dirt and make 500 hp and 500 lb-ft of torque with a few easy modifications and these same iron Ford heads. Think we're just bench racing? Read on ...
Let's begin with the events of a steamy, hot Southern California summer day. We arrived early at Westech Performance to get our 331 Stealth small-block engine on the dyno. Right away, two things necessary to make the projected power weren't available at Westech on the day of our test. Without a velocity stack for the carburetor and the appropriate-sized 1-3/4-inch Hooker Super Comp headers, our numbers fell below 400/400. Despite these shortcomings, we did remarkably well on the dyno, turning in the broadest torque curve we've ever seen from a low-cube small-block Ford.
When Marvin McAfee of MCE Engines was planning our 331 Stealth small-block, he predicted numbers between 350-400 hp and 350-400 lb-ft of torque through the mufflers, which we essentially made. Marvin's goal was a streetable small-block powerhouse that would:
Under ideal circumstances, we should have achieved 410 hp and 404 lb-ft of torque with our engine package. Ideal conditions include: