581-Inch Solid-Roller EFI Fed Big-Block Chevy Makes 975 HP on Westech’s Dyno!

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581-Inch Solid-Roller EFI Fed Big-Block Chevy Makes 975 HP on Westech’s Dyno!

This 581-inch EFI-fed big-block Chevy was crafted by Jeff Ginter Racing Engines (JGRE) in Artesia, California. JGRE builds a ton of engines for hardcore off-road racing and this 581 was no exception. Dyno jockey and co-host of Engine Masters, Steve Brule, knows we love us some big-displacement big-blocks, so he made sure to send over the 4-1-1 on this race-ready brawler.

Starting with an aluminum Brodix tall-deck block, JGRE knocked out the bores, and using a Callies billet crank and a matching set of Ultra Billet rods built a rock solid short-block displacing 581 glorious inches. Topping the short-block, and giving the mill a pump-gas-hostile 13.1:1 compression ratio, are a pair of CNC ported Brodix SR20 aluminum heads.

The SR20 heads from Brodix utilize a 0.500-inch, 440cc raised intake port, combined with 2.400-inch intake valves that flow an unheard-of 507 cfm. These 20-degree heads even flow 335 cfm on the exhaust side with just 1.800-inch valves. The rest of the valvetrain consists of T&D shaft rockers (PN 3142), Isky solid-roller lifters, and a Comp 268/278 duration .808/.777 lift 114 LSA camshaft.

For the full story, check out this article from Motor Trend.

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