I thought I’d share details about a few of my customer builds.

426" 651hp 91 pump gas 12.75:1 compression Small Block Street/strip Motor

340 X block with splayed billet main caps and ARP fasteners, bushed lifters, decked/squared to 9.585, align honed, stroker clearanced (machine work performed by DRAM Dan Costello (RIP) at Performance Only in Florida)

360-1 Indy heads ported by Dwayne Porter, with Harland Sharp rockers, PAC-1325 springs

K1 4.125 stroke crank with Chevy rod journals

Callies Compstar H-beam rods 6.200”

Diamond Custom forged pistons 4.060 bore, 1.308 comp height, Valve relief volume -6.7

Indy 360-1 Intake also ported by Dwayne Porter
Hughes Engines custom street/strip billet roller cam .656/.672 269/275 108 LSA installed at 105 and solid roller lifter designed specifically for this build with 12.75:1 by Dave Hughes (Dave actually spec’d the compression, I ordered pistons after we designed the cam for this motor)

ProSystems custom built 4150 carb

TTI headers for E body

Made 651 hp and 585 torque on the Dyno with 91 octane pump gas, will make 700+ with race fuel and more timing (Dyno’d with only 29 degree timing)

I was really nervous about the 12.75:1 compression but I decided to trust Dave and his years of knowledge and ended up very pleased. Our goal was 650hp with 91 pump gas and the use is 70% street and 30% strip.

Link to all the build pictures: 426 Build pictures