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!

If aluminum rods were used, I think it has a good chance at surviving. I think I would have filled the block to at least the bottom of the water pump holes though, especially considering the HP level.

Oh...and those intake ports are "purdy". Did you have to go to an offset lifter? Looks like the pushrod holes were moved over quite a bit.

Larry don't throw them away just hog them out more from your 180cc port! But then that will hurt that "small port velocity" everyone talks about with D ports because the ccs will get closer to E head/ported KRE size.

Looks like head bolt tube as well as pushrod tubes and all that epoxy on top to raise the port, and just a nub of a guide.Bet it's at least 215cc. LOTS of good shaping and grinding there, very nice.

Man my buddies 48s were barely 200 cfm on the intake side, took some moderate porting to even get them to 225.

Ya send them out to Utah and I'll make sure they get tossed..........On my car!!!!

Now...Now Skip, lets not turn this into an "apples to oranges" discussion.
Everyone knows that "small port velocity" propels big 4200lb "boats" to mid-11 e.t.'s.:D

127% VE? Very nice!!!!!!!I hit 97% on my last engine and I thought that was good,lol.Very impressive.I want one,,,,,,,,,,,,,,,(whine).

very nice head work. i know how much grinding that is involved in those heads. i would guess you have well over 300 hrs in the heads?
Jim, have a flow sheet and dyno sheet you would post?

Kool Pics Jim, Glad you decided to share.
Like your site, always wanted some R.A.C.E. heads........

I just wanted to note these are not those same "small" D ports making big HP before you hard core D port fans start suggesting they are! Kind of like the 310+cfm KRE heads aren't 185cc! It takes a larger port to move that kind of air and make that kind of HP no matter what the material or head that is started with. Obviously a well done head!

I'll bet ALOT of hours and "black boogers" from all that porting!

So got any chamber pictures to see what they look like using such little timing?

Hey Jim,

Good Job! Looks like very good work. What minimum CSA did you end up with? It looks like you did a very very good job around the push rod.

Lynn

Obviously Skip, I think that everyone would agree that 800HP isn't going to be achieved with "small" port D-heads and aren't suggesting that it can.
Let's be honest, would anyone have ever bet that a person could produce those numbers from a iron "doorstop"?
Perhaps "Gach",:D....but not the regular crowd here.
I'm sure Mr. Robertson has amazed everyone with the numbers and workmanship on those heads.

Very nice Jim--PONTIAC POWER.

NICE..... wonder what you could of got if you started with a KRE?

Wow! Nice job!

outstanding job jim. you gonna put that in a true 10 car with a little juice and come play in dallas this year?
looking forward to seeing you up there again
i got something for them dallas boys this year.

They are some awesome numbers. Congrats.

Probably not nearly as much, because KRE D-ports are only replacement heads for street cars. They were never intended to make horsepower, only to have a place to mount your original valve covers. :p ;)

Trust me when I say this,,,JD aint "just whistlin' dixie" with that comment! ;)

That thing is loaded for big game!!! :eek:

It's all double top secret/cone of silence type stuff.

If I told ya'll any more,JD and Steve would put a contract out on me...

:bolt:

Once again the double the cfm = approx HP myth is dispelled.

john

We used C-16 VP fuel

The intake port is 218ccs good eye Skip.

Yes we hit everything - water, air, bolts, and pushrods. Pushrods are moved a little over .200".

Very light aluminum GRP rod.

Engine is now in a 71 T/A. It ran low 11s at 3565lbs with the mild 462 that is pictured with the Warrior on the website.

300 hours...Probably close I lost track a long time ago. :-)

Min cross section is right at 2.85sq in

Jim

i know you hit air at a 2.85 min csa. alittle off the subject, but about maxed out iron heads....i saw a set of iron sbc heads at Meaux's shop that was on a national record holder car. they literally made the ports. welding, re shaping, countless hours involved. they gave up on running them wet and just ran the things dry.

Dyno session pics
 

A couple of pics of the dyno session along with the sheetmetal intake. Chamber shot also included.

DittoLet me know when - I'll be waiting outside :D

I wonder how that sheetmetal intake would have faired with a pair of carbs instead of one?

Made a different single four top and will try that in the car. Another self imposed limit for this project; I am running the shaker. In other words I am out of wiggle room. The Victor did so well that at this point it will probably be the manifold to run.

Might have a near new sheet intake for sale soon :-)
Jim

serious dedication jim, my hat's off to this effort. 127% VE- thats a big part of how a 315cfm port can make 800hp. extensive research to accomplish that!

[QUOTE=

Pushrods are moved a little over .200".

Jim[/QUOTE]

what is the width at the bulge?
thanks,
jim

Jim neat job! I'm kind of partial to having a Shaker also, especially on the motor.The iron heads stealth is even better!-You need to massage something to at least have the Shaker sitting on the motor,add that hot air hose to hide even more and look stock.

What are the intake port dimensions? Got an extra Victor that is almost that big I think.

Not too bad a "calibrated eyeball" I got!

Larry if you really have read my posts in regards to iron heads I've never said they can't be made to flow good numbers. I've repeated said once you start getting really good numbers though you end up getting larger volumes-like your heads and like Jim's major massaged here, or Lynn's Super Stock major reshaped,massaged, then epoxy filled heads. Then we are right at the same volume as KRE and E heads for the same flow and do NOT still have the increased velocity of a small port that is always the put down of aftermarket heads. It generally takes a larger port to flow the big numbers! Even your heads are larger than what pushes that 4000+lb wagon in the 11s,few if any other ported D ports are as small as Jim Hands for the flow.Let's see 300 hours at even a $20/hr shop rate $6000!

Jim-Got a classmate in Abilene-Larry Ellis, played football at A&M before vet school. You ever run into Mike Cooke in those parts?

I'd love to see what you could do with a '69 Firebird RA IV running in the Factory Appearing Stock Tire racing class.
http://www.fastraces.org

Yes, and I feel the ports on my #16's are bigger than they need to be for the majority of driving I do. I think they would be better suited to an engine thats used strictly at the track rather than street.
The 3.23 gears are great for street driving but i believe if I were to go to a 3.73, it would better suit the engine combo.
I'll keep the 3.23 for overall street use.

The Buick guys have a stock appearing class. Paper thin iron heads, 12:1,cast iron manifolds you can almost see through hauling a$$! These heads would work for a Pontiac in a similar class. Dave Gessler that posts here some is king of the Buicks that do this.

Larry just sell that SD car and put a 535ci Kaufman head motor in the black car! Then you can lug it all you want with the 3.23s! But I'd get a Jerico in front of them:)! And you'd still have money for college tutions!