800HP D Port
 

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

WOW!

Exactly! That is incredible!

Impressive for a stock block/crank deal!! Any worries with those parts?

Jim,

That's very impressive power for a relatively small cube D-port motor. What kind of flow numbers were you getting on those 48's on the exhaust side?

Tim C

Obviously, this was not his first time at the rodeo!

For those who haven't looked.......click on Mr. Robertsons web link.
VERY impressive and informative site.
The fabrication and craftsmanship is incredible.

:hail:

I thought 300cfm d-ports was a myth but these pics make me think otherwise.:eek:
http://www.racev8s.com/images/headpo...rtPontiac1.jpg
http://www.racev8s.com/images/headpo...rtPontiac2.jpg
http://www.racev8s.com/images/headpo...rtPontiac3.jpg

Thanks for the kind words. It was a project that I let drag on for three years. The heads took the longest to get them to do what I had envisioned.
Exhaust went 206 cfm @ .700" lift @28" on our bench with the 2" car header attached.
Jim

Very Nice!

Fantastic Job! :)

What's it going in?

Very impressive.
Didnt even have to go over 7K.

gas or alcohol

FAR OUT!

I'll bet those aren't 160cc D ports either! They look huge! And not a low rpm D port motor either.

Neat project good luck with it!

Outstanding accomplishment.

Jim, I am jealous. What a great D-port accomplishment-in fact that would be impressive with aluminum round ports. (Jim is a really nice guy too) cigars were good. LOL

.......think i'll throw my d-ports out the window.....:smash:

Great signature!