Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2401335
11/10/17 12:05 PM
11/10/17 12:05 PM
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Joined: Jan 2003
Posts: 10,008 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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You may not need it, but dual pattern cams can have a serious power advantage, and from what little I know, are very effective. I put together a 408 with Magnum EQ heads, dual plane intake, 10/1 compression. Cam is a Comp Muthr Thumpr with 235/249/ 107 LSA duration. It made 500 hp from 5200 to 6100 rpm,519 TQ at 4100. You can and probably should have a custom grind made just for you.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2401416
11/10/17 03:22 PM
11/10/17 03:22 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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Educate me. I thought the only purpose for a dual pattern was to help out the exhaust side when needed. Magnum style heads did not need the help I have read. Is there more to it than that? Thanks. Call Jim at Racer Brown and have him grind you something. The dual pattern cam is highly overrated.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2401418
11/10/17 03:23 PM
11/10/17 03:23 PM
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Joined: Sep 2014
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madscientist
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Washington
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As a second thought...the intake port is so small and weak for most engines you should be running a dual pattern cam.
It should have 10 MORE degrees on the intake. Not more on the exhaust.
Also, is a dual pattern cam less intake duration or more exhaust duration?
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2401544
11/10/17 07:58 PM
11/10/17 07:58 PM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
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Howards cams has a number of single pattern cams and I think the lunati street master line is all single pattern. Don't just look in the summit catalog. On thier website I think single versus dual pattern is something you can filter in a search.
Also go to the sites for lunati, comp, etc.. and download their catalogs to look.
FWIW I don't recall magnum heads prefering single pattern, I thought the 308 LA head was the only one that ran better with single pattern.
"The happiness of your life depends upon the quality of your thoughts" ~ Roman Emperor Marcus Aurelius
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Re: Small block single pattern hydraulic flat tappet cams
[Re: gregsdart]
#2401599
11/10/17 09:52 PM
11/10/17 09:52 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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master
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You may not need it, but dual pattern cams can have a serious power advantage, and from what little I know, are very effective. I put together a 408 with Magnum EQ heads, dual plane intake, 10/1 compression. Cam is a Comp Muthr Thumpr with 235/249/ 107 LSA duration. It made 500 hp from 5200 to 6100 rpm,519 TQ at 4100. You can and probably should have a custom grind made just for you. and if you are looking for off the shelf, Hughes Engines has a wide variety to choose from. They are the small block Chrysler guru's IMO.
Fastest 300
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Re: Small block single pattern hydraulic flat tappet cams
[Re: madscientist]
#2401902
11/11/17 02:07 PM
11/11/17 02:07 PM
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Joined: Mar 2010
Posts: 1,061 Atlanta, GA
mgoblue9798
OP
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OP
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Atlanta, GA
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As a second thought...the intake port is so small and weak for most engines you should be running a dual pattern cam.
It should have 10 MORE degrees on the intake. Not more on the exhaust.
Also, is a dual pattern cam less intake duration or more exhaust duration? I should have said magnum style head conversion. It will actually have a set of the Indy RHS heads that have been prepped. Dual pattern can be either way, but the off the shelf stuff I have seen has increased duration/lift on the exhaust lobe for the small block. Thank for you help.
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2401904
11/11/17 02:12 PM
11/11/17 02:12 PM
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crabman173
Unregistered
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crabman173
Unregistered
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Fun part of all this is You can take 15 cams that are in same family size wise from every maker--dyno back to back and you will be surprised how little diff there is--YES one will make 20 more HP on a 500 HP build but almost every 408 back yard built by anybody with any hyd cam --guys doing one engine not engine pros--will be between 475 and 500 HP so ....it is not a life and death deal--you select a cam that is not too big to live with and drive the way you intend to drive and go with it simple as that--who cares and who will know that it is 475 or 495--big deal Single pattern cams work Great --dual patterns are way over rated
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2401906
11/11/17 02:15 PM
11/11/17 02:15 PM
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Joined: Jan 2003
Posts: 11,713 Portage,michigan
B3422W5
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I Live Here
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Am probably looking for a cam for my new 418, and Dwayne liked a single pattern for it over a dual pattern i was considering. Should have said its a solid flat tappet
Last edited by B3422W5; 11/11/17 02:16 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2402036
11/11/17 06:35 PM
11/11/17 06:35 PM
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crabman173
Unregistered
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crabman173
Unregistered
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I have found that the 238 ish range in a 408 makes a great street car and driver at 475 Hp range( with zero effort-no porting etc) and to make 500 plus they seem to like a lot bigger cam that is not as good on the street / vacuum etc Love that idea of a solid!! They make some steam and are so much cheaper than a roller
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Re: Small block single pattern hydraulic flat tappet cams
[Re: ]
#2402129
11/11/17 08:52 PM
11/11/17 08:52 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
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Val-haul-ass... eventually
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Single pattern cams work Great --dual patterns are way over rated Nothing is a for-sure thing with cam design, and it's always a case of "it depends." The only sure thing is the answer doesn't come from a catalog or a web site. I'm still amused by a magazine article from years ago that was supposed to show the merits of a well-known cam company's new series of dual-pattern grinds. The test compared it to one of their older single-pattern designs. The old cam, IIRC, made more torque, made almost as much HP, and was more stable at higher RPM. I don't recall how the article tried to spin the results, but it didn't do that new cam series any favors IMO.
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2402153
11/11/17 09:22 PM
11/11/17 09:22 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
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I Live Here
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I still use a lot of single pattern cams....... And some of the builds I've been happiest with had one in it.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2402162
11/11/17 09:46 PM
11/11/17 09:46 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
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master
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New York
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the only purpose for a dual pattern was to help out whichever side needs it.
Boffin Emeritus
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Re: Small block single pattern hydraulic flat tappet cams
[Re: polyspheric]
#2402332
11/12/17 02:11 AM
11/12/17 02:11 AM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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Az
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the only purpose for a dual pattern was to help out whichever side needs it. and one side or the other almost always needs it.
Fastest 300
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Re: Small block single pattern hydraulic flat tappet cams
[Re: mgoblue9798]
#2402356
11/12/17 02:49 AM
11/12/17 02:49 AM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
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New York
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Sometimes the bias can be tweaked toward the intake side with higher ratio rockers (but this generally doesn't work on the exhaust side, which is more heavily dependent on the XO opening point than lift).
As I have posted before, the only reason why manufacturers use the same lobe and rocker on both valves is: it's the cheapest way. They try to get the ports to work that way even if it's not particularly efficient. The function of the two ports (gas speed, temperature, pressure) is as different as chalk and cheese, and their needs for an event are very different.
The say on whether dual pattern will help should be your porter as the final analyst of the relative port capacities.
Boffin Emeritus
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