[Jim Robertson]

The latest dyno results of my 469 cid engine are in. We were able to make a little over 800 naturally aspirated HP with my self imposed limits of OEM block, OEM crank and OEM D port head. It made 806 HP at 6700 and 695 lbs ft Torque at 5100. Volumetric efficiency peaked at a very nice 127.1%.

1969 428 Block; 4.190” bore; Filled to bottom of freeze plugs; 3 center billet caps
9799103 “N” 455 crank stroked to 4.250”; Radiused counterweights to reduce windage
6.782” connecting rod
JE flat top pistons
Child and Albert gapless rings
#48 heads; substantial port work; flowed over 315 cfm with intake and carb; much epoxy
2.110”/1.770” REV custom valves
13:1 compression
Isky Solid roller cam; approx 270/280 at .050”; installed at 105 IC
1.65 Crane gold roller rockers
Manton 9.400” pushrods
Victor intake welded and heavily ported; polished exterior; 1” spacer
1050 Dominator; tweaked
MSD billet distributor; crank trigger
2” Hedman Hustler headers; 30” collector extension
Star Vacuum pump
Custom built oil pan

Best power was made with 32 degrees timing, 10” vacuum pump setting, 88 jets, 145 water temp and 130 oil temp.

Built a sheetmetal intake for this combination but it was down on HP and torque slightly from the Victor, long story but I wanted to run the shaker on my 71 TA so some compromises were made in the initial design. We are still working on making this intake work in the car.

Best of luck to each of you in 2007,
Jim Robertson
Robertson Auto Consulting and Engineering
www.racev8s.com