Cam Profile

[440Charger]

Don't worry dude, you'll hit the jackpot in Vegas one of these days 

[Chryco Psycho]

that wouldn`t be the hillbilly jackpot that pays 3 million ......$3 / year for a million years would it

[moper]

I just read this article http://www.iskycams.com/techtips.php#2001

He talks about how needing a dual pattern with more exhaust duration is a "myth" once you dump manifolds and go with headers.  Check it out(use links at top of page).  Does anyone have experience with dual vs single pattern when using headers?  Got any #'s or proven results?

I guess I'm questioning my need to dual pattern now - any input would be mucho appreciated!

Thanks,
- Doug

IMO, he is oversimplifying. What he is saying, is that if the ports are perfect in flow balance between intake and exh, then a  single pattern cam will make more power. He's right. But, read the next one. He (very briefly) mentions that (paraphrasing) "some setups may require more exh timing due to exh system design and/or execution". That means if you have a good flowing exhaust...That generally doesnt include and exhaust system. That includes a good flowing set of headers, with the right amount of collector and tube length. But in the real world, where you are running unequal length header primary tubes, a collector that doesnt negate ground clearance, 8' plus of bent piping, and some kind of mufflers, exh backpressure is present. And always will be. The way to help the air pump do it's job is to have the valves open at the right time, for the right amount of time for your situation. For a street car with exhaust system requirements and ports that may or may not (stock and/or iron heads with average porting) have the right balance themselves, that means more lift and/or duration on the exh side. It's up to you to decide what will work the best for you. Single pattern cams work great in cars that can make use of the extra power they can give. Split patterns are much more usable for a car that drives 50% on the street and has to conform to the rules. Like I said, he's right, but he's glossing over a lot IMO.

[JS29U]

  I agree with moper with the split duration with street- strip cars. And psycos Engles cams is a good co. They used too make hughes cams. Some get into trouble with too fast a lobe ramp. If your lifter bores were not bored in the correct position, the lifters edges grind into the lobe.  I used too talk too harold (ultradyne) alot, been 4 years tomorrow since last time,and his edge of tappet got no closer than .017 which gave an extra .015 using a ford profile on a chrysler 904 lifter, and an extra .048 using a chevy design.

  I always wanted to use the 528 mp cam back in 75, but still have 471- 474 mp 68 overlap. Idiots said 528 was to big. I still like to try it if go back to manifolds, but hear they roud out alot. Magazines and comp cams tried too beat the 528, but couldnt. I can see why talking too comp cams last week at the clearwater, fl sema type of show. He didnt want too talk about thier mm lobes, just that they will wipe out and insisted that i go hyd roller. I told him im considering going too thier extreme energy solid roller 570- 576 242- 248  280- 286, but at 112, he kept saying go hyd at those rpm. But the hyd roller lifters weigh a ton!

  One other Harold used too say, at .200 lift, the 528 is 152degrees, said his ford lobeswere at least 6 more at .200 with similar lift.  very easy too beat.

   Now that rotella is sm rated, i just might go with a roller, and like mopers 6 pack restrictive as heck, i just mighr sell the 6 pack if someone wont sell me 2 end floats (thier shorter?) and call the supercharger store, but have too decide before buying the cam. I would then go 114 lsa with the roller and forget going too a 505.

[JS29U]

   Forgot too say, last week at the clearwater show, they had Dick Landys 70 challenger, sox and martins 70 cuda (real cars), a 65 altered wheelbase hemi and altered wb ford 427 sohc.
 Landys slicks were huge sox cuda,  33-14-15 ?

   The guy watching the cars said Landy got wild and mean when drunk.

[moper]

Teh cam I spec'd uses the new KV series 904 lobes from Engle. I enjoyed our conversations. Adn they called on two occasions with questions for me because they had concerns. I like that fact. They care a bit. And, a custom ground cam and solid lifters shipped from CA to CT for $282. Cant beat that. So far, so good. All lifters fit well in the bores, and they all rotate with no oil. So looks like we're still "on track"..lol.