StrikinLightnin
As Chris said Harold is very busy with the Voodoo line, the hyd-flats are out now and he is currently working on other lobe families. There will be some new developments in marine specific grinds by various manufacturers soon.
Bob

If you want an actual Ultradyne cam, contact Bullet Cams. They bought all the Ultradyne stuff. Timmy is working there now and they have all the grinds that Harold designed. I had a number for them, but cant find it now.

I went with Lunati after my flat tappet Ultrdyne died of spalling after 90hrs or run time. I got a cam just a touch more duration from Lunati and it lasted only 20hrs. Same death, spalling ( small holes in the nose of the cam lobe), and I sent the cam back and I have to call them every month or so and get an excuse about them looking into it. Not very happy with Lunati at this point, even if Harold is there. I didnt speak with him about my issues, ened up with Jay..

Dick

Ok.. I looked around and found the number for Bullet Cams.. The guy that owns the company is named John, and I know Timmy works for him now. Timmy is very knowledgeable about cam lobe profiles. Harold was his teacher..

662-893-5670

Hi Jim,

I was in Tulsa this weekend for the Chilibowl midget races. It was some wild stuff, 255 entries. Saw only 1 black flag in the 3 days of racing I saw.

My cam is one of Harolds new designs for a boat from Lunati

at .050 tappet lift
230 intake 238 exhaust with 114* lobe separation .600 lift at valve
set at 109.5*

about 100 hours on it so far with no problems.

RPM TRQ HP BSFC
3000 533 304 .64
3100 544 321 .62
3200 552 336 .59
3300 558 351 .60
3400 559 362 .59
3500 557 371 .59
3600 556 381 .58
3700 554 391 .59
3800 557 403 .56
3900 555 411 .57
4000 552 421 .57
4100 554 433 .56
4200 560 448 .56
4300 563 461 .56
4400 572 479 .56
4500 579 496 .55
4600 580 508 .55
4700 581 520 .56
4800 575 526 .57
4900 574 535 .54
5000 572 544 .56
5100 570 553 .56
5200 564 559 .55
5300 558 563 .54
5400 553 569 .55
5500 555 581 .56
5600 544 580 .56

509 gen4 block & heads. This is the boat setup (fat & 36 degrees)

850 holley, merlin single plane marine, ultradyne cam. pocket ported heads, port matched, ceramic coated forged pistons.

couldn't justify heads this time. Actually was pulling motor to make some changes and frshen up when found rotten stringer which lead to finding rot in transom and floor.

Motor has stock gen 4 heads except extreme duty valves and bronze guides. Heads were pocket ported and port matched to merlin marine single plane intake. Intake was also matched to carb flange.

pistons are 212140 srp forged, Polydyn ceramic coated on top and some kind of teflon coated on sides also polydyn. rods were bronze bushed. Block was slightly chamfered to match head gasket.

MSD 6m with soft touch and msd dist.

Wow, thanks MHawkins for the info! Our motors are almost twins, I hope I see that kind of HP. That's very impressive!

Jim

U R welcome Jim,

The dyno operator predicted just over 600 HP had we run it leaner,
but I was a wuss and declined to do that. Engine builder wasn't to happy either as they have a bit of a rivalry going re stock headed big blocks.

Only thing I forgot to mention was that we swapped out the main body on the carb for one of those PROFORM main bodies. That was responsible for almost 18HP over a stock 850. On top was a KN filter in one of those housings that drops down about an inch around the sides of the carb.

My motor is a gen5 merlin G J heads 310 9.5 to1 comp 850 bg carb dart intake S/M dry EX , CAM from Isky around 622 245/255 at .50 114lobe center can't find my dyno right now but top of my head 4600 tq642 hp600 at 5050 5600 647hp alittle head work I 'll look tonight for the sheet