Designed for circle track’s weekend warriors, this bulletproof
350-horsepower, 350-cubic-inch factory-sealed racing
engine is a tough combination of power and reliability—
and it fits almost any racing budget.
Based on GMPP’s popular 350 HO engine, including a
brand-new, four-bolt-main block, 9:1 aluminum pistons,
cast iron crankshaft and GM iron Vortec cylinder heads,
the 350/350 Factory Stock version features a high-rise
dual-plane intake manifold, 8-quart single kick-out circle
track oil pan, valve cover kit with breather tube and
breather, and special "kool nut" rocker arm nut design.
The 350 HO’s unique dual-pattern cam is included, too.
It’s based on the one found in 1965-67 Corvette 327
engines, but with more lift and duration to clear the
engine exhaust quickly and move in more air—providing
excellent mid- and high-range power, where you need it
on the track.
Delivered complete from the oil pan to the intake manifold—
including an HEI distributor—the 350/350 racing
engine has the proven parts and horsepower to enable a
competitive racecar. Getting it into the winner’s circle,
however, is your job!

Old P/N 88958602

• TECH SPECS: Circle Track 350/350
• Part Number: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88958602
• Engine type: . . . . . . . . . . . . . . . . . . . . . . . Chevy small-block V-8
• Displacement (cu in): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
• Bore x stroke (in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.00 x 3.48
• Block: . . . . . . . . . . . . . . . . . . . . cast iron with 4-bolt main caps
• Crankshaft: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nodular iron
• Connecting rods: . . . . . . . . . . . . . . . . . . . powdered metal steel
• Pistons: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . cast aluminum
• Camshaft type: . . . . . . . . . . . . . . . . . . . . . . hydraulic flat tappet
• Camshaft lift (in): . . . . . . . . . . . . . . . . .435 intake / .460 exhaust
• Camshaft duration (@.050 in) . . . . . 212° intake / 222° exhaust
• Cylinder heads: . . . . . . . . . . . . GM Vortec iron; 64cc chambers
• Valve size (in): . . . . . . . . . . . . . . . . . . 1.94 intake / 1.50 exhaust
• Compression ratio: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1:1
• Rocker arms: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . stamped steel
• Rocker arm ratio: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5:1
• Recommended fuel: . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 octane
• Ignition timing: . . . . . . . . . . . . . . . . . . . . . . 32° total @ 4000 rpm
• Maximum rpm: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5500

INSTALLATION NOTES
• Requires addition of carburetor, starter, water pump,
plug wires and exhaust system (not included).
• Requires an externally balanced flywheel (not included). See
page 80 for flywheel selection.
• The 8-quart circle track oil pan is 8 inches deep at the sump. It
will clear most GM rear-steer chassis with stock engine location.