Put in the correct order, the numbers four, two, and seven have an almost mythical aura to the Bowtie faithful.

That’s because some of the most iconic machines to come from Chevrolet in the 1960s were powered by versions of the fearsome 427 cubic inch Mark IV Chevy Big Block—including the L88 Corvette and ZL-1 Camaro.

As potent as those engines were however, since they were Chevy Big Blocks, the obvious drawbacks were physical engine size and weight.

But what if…what if…you could build a 427ci engine with the power of those early BBCs—only in the compact packaging of the trusty Small Block Chevy V8.

Well, with an all-new Summit Racing SPC Engine Block in their shop, that’s precisely what Pat Topolinski and Frankie Forman set out to do in a recent series on the “Engine Power” TV show from PowerNation TV.

Summit racing SPC Engine Block 427 on stand
(Image/PowerNation TV)

Thanks to the strength and finishing of the Summit Racing SPC block, the guys are easily able to run a 4.125 inch bore and 4.000 inch stroke to get to that magical 427 cubic inch number.

But that calculation is just the start of the party, as the team tosses a smorgasbord of upgrade parts at the block to create some serious dyno numbers at the end.

Did their freshly-built 427 Mouse eclipse the output of those Big Block Rats of yesteryear?

We won’t spill the proverbial beans here. If you want the details behind the build, you’ll have to watch the episodes, direct from the PowerNation TV folks.

We’ll give you some links to the “Engine Power” series below. And better still, we’ll provide you a quick parts list so if you want to build 427 cubes of tasty Small Block goodness, you can follow the same recipe too.

Watch the PowerNation TV 427 SBC build episodes here:

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Engine Power Super Street 427ci SBC Parts List

Engine Bottom End

  • Summit Racing™ SPC Engine Block – SUM-150202
  • Summit Racing™ Freeze Plugs – SUM-G1581
  • Summit Racing™ Pipe Plug Kit – SUM-921010
  • Dura-Bond Engine Hardware Finishing Kit – DUR-FKC-1HP
  • Fel-Pro Performance Rear Main Bearing Seal – FEL-2900
  • Summit Racing™ Forged Crankshaft – SUM-SBC35040002P
  • Summit Racing™ Performance Connecting Rods – SUM-SBC60002H
  • Summit Racing™ Connecting Rod Bearings (standard size) – SUM-171000
  • Clevite H-Series Rod Bearings (standard size) – CLE-CB663HN
  • Clevite H-Series Rod Bearings (0.001″ thinner) – CLE-CB663HXN
  • Clevite H-Series Main Bearings (standard size)   – CLE-MS1038H
  • Clevite H-Series Main Bearings (0.001″ thinner) – CLE-MS1038HX
  • Summit Racing™ Forged Pro Pistons – SUM-SBC4274125
  • Summit Racing™ Pro GPX Gas Ported Piston Rings – SUM-GP412512
  • Summit Racing™ Pro SBC LS Firing Order Hydraulic Roller Camshaft – SUM-1226
  • Melling Shark Tooth Oil Pump – MEL-10552ST
  • ARP Oil Pump Stud Kit – ARP-230-7003
  • Moroso Street/Strip Oil Pan – MOR-21816
  • ARP Oil Pan Bolt Kit – ARP-434-1804
  • Summit Racing™ Bracket Racer SFI Harmonic Damper – SUM-C4265

Engine Top End

Our pal Jeff Smith took a closer look at the Summit Racing SPC engine block—you can read his feedback here. Summit Racing’s SPC Engine Blocks for Small Chevy May be the Best Ever