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Edelbrock Dual Crate Engines - Roaring Twins

Edelbrock Builds A Couple Of Cool Small-Blocks

By Mike Petralia

When you've been in the high performance business since it basically began, you have the opportunity to learn a thing or two about making power. Whether it is all-out racing power, or mild street power, Edelbrock has had the time to develop a perfect combination. And now they're offering two street small-blocks. One for power and one for torque.

Performer Rpm 350
Edelbrock's horsepower motor starts with a GMPP ZZ4 short-block, using all factory GM parts for durability. To that, Edelbrock adds its top end package that's been refined with literally years of dyno tests. The components Edelbrock installs on its Performer RPM engine make it a very reliable streeter. It's not designed for high power, but still makes more power than any small-block you could get in a new car today. Even though it's not their torquiest motor, the Performer RPM 350 still cranks out 325 ft-lb at 2,500 rpm. Peak power comes at 6,500 with 410 hp. That means this engine has a long power band that will pull and pull and pull in a street car with long gears or an overdrive. On top of all that, all Edelbrock crate engines include a 2 year/24,000 mile warranty, so you know you're covered if something goes wrong. See all the details and power results of Edelbrock's Performer RPM 350 later in this story.

383 Rpm Engine
The torque monster in Edelbrock's small-block line up is the 383-cid RPM. It, too, is based on a GMPP short-block using all factory components. The difference is up top, where Edelbrock installs a few different components to add torque on the street. This stroker combination grunts out exactly 1 ft-lb-per-cid at 2,500 rpm. The rpm band of this engine is all done at 5,500, so it's not a high revving brute either. Peak power is 436 hp at 5,500, but it still carries up to 430 hp by 6,000, so it's got some long legs too.

Edelbrock Performer RPM 350 specs
*9.5:1 compression GM Performance Parts ZZ4 short-block (Includes four-bolt mains, forged steel crank, hypereutectic pistons, 8-inch dampener, and one-piece rear main seal)
*PN 60899 cylinder heads(170cc intake runners, 64cc chambers, 2.02/1.60 stainless valves)
*PN 7101 RPM intake manifold
*PN 1413 EPS carb (800 cfm)
*PN 7776 aluminum roller rockers
*PN 8550 head bolts
*PN 4153 valve covers
*PN 7102 camshaft(308/318 advance, 234/244 at .050, .488/.510 lift, 112 lobe separation)
*PN 9630 pushrods
*PN 7800 timing chain
*PN 8820 water pump

Other parts included:
*Milodon oil pan and pump system
*Milodon timing cover
*MSD distributor and coil

Edelbrock Performer RPM 350 dyno test results:

RPM TQ HP
2500 325 155
3000 359 205
3500 350 233
4000 395 301
4500 407 348
5000 401 382
5500 387 406
6000 357 408
6500 331 410
MAX 407 410

Edelbrock 383 RPM Engine Specs
*9.8:1 compression GM Performance Parts short-block (Includes four-bolt mains, forged steel crank, hypereutectic pistons, 8-inch dampener, and one-piece rear main seal)

By Mike Petralia
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