Cam selection questions
#2336039
07/12/17 05:37 PM
07/12/17 05:37 PM
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Joined: Aug 2007
Posts: 732 USA
440mopar
OP
super stock
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OP
super stock
Joined: Aug 2007
Posts: 732
USA
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My engine guy will be assembling my 470 stroker soon as the machine work is just about complete and I could use some recommendations regarding a couple of things. First, I need some advice on cam selection/size. My intent is go with a solid lifter, flat tappet cam this time. From some of the information I have read regarding other similar builds, it looks like a cam anywhere from 560 to 620 lift is typical. That being said, I would like to have a fairly lumpy sounding cam if I can as I have never had much more than a stock grind cam before in any of the cars I have owned. The car (69 Dart) will be primarily street driven with as mentioned, a pump gas 400/470 stroker, Edelbrock RPM heads, 10.8 comp. ratio, 870 Holley carb on an Edelbrock RPM intake, 727 trans. with 3200-3500 converter, 3:73 gears and 29" tall tires. Second, my engine guy is telling me that because I want to go with a solid flat tappet cam that I need to get different valve springs as the springs that came on the RPM heads are more suitable for use with a hydraulic lifter cam. If this is true, I could use a recommendation on replacement valve springs as well. Thanks in advance.
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Re: Cam selection questions
[Re: 440mopar]
#2336079
07/12/17 06:42 PM
07/12/17 06:42 PM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,292
Bend,OR USA
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I like and use Comp Cams in most of my engine builds, sometimes a Bullett or Ultradyne solid roller cam in drag race only motors if the customers insist on those brands. Take a look at Comps # 23-232-4 or the next bigger 23-233-4 grinds, I have used both of those cams on BB pump gas street cars, they work well and they should be fine with the Eddy springs as long as you break the new cam in properly If you haven't bought a set of adjustable rocker arms yet buy a 1.6 ratio set also That ratio will make either cam have more lift and duration and help make either one of them work great I have a 1969 Dart GTS H code 383 4 speed car also, I use to race it with a stock stroke and bore 440 motor with a old solid lifter cam and 906 heads with the old heavy TRW 11.5 to 1 pistons, a race 8 inch converter with 3.91 gears and 29x105x15 inch slicks, it ran a best of 11.17 at 122.+MPH up in Las Vegas, NV in November a lot of years ago.
Last edited by Cab_Burge; 07/12/17 06:43 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Cam selection questions
[Re: DusterKid]
#2336663
07/13/17 09:49 PM
07/13/17 09:49 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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You can go to any of the cam manufacturers web site and fill out the cam selection form. In the comment portion just note your intentions and they should be able to get you something that will work and you like. On my builds that what I do. I've been using comp cam recommendations with success in my last few drag car combos. Smart move - and when in doubt, go one size smaller. Lumpy sounding cams are impressive on the street - until you step on the loud pedal and there aint no body home.
Fastest 300
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Re: Cam selection questions
[Re: 440mopar]
#2343113
07/25/17 03:55 PM
07/25/17 03:55 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Just to update, I still haven't bought or even decided on a cam yet. I did as suggested and called four different cam manufacturers (so far) for recommendations based on my build that I mentioned in my original post. I have been given recommendations of:
244/252 duration/540 lift 254/254 duration/554 lift 254/254 duration/540 lift 260/264 duration/620 lift
I showed these numbers to my engine guy and while he thinks the last one maybe too much cam, he also thinks the first three are not quite enough. He thinks a cam somewhere in the middle would be about right. Your thoughts please. Take the lift. 260@.050 is not that big for 470 inches. I run 255 on 340 inches idles at 1000. Could go 800 but don't like them running that slow.
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: Cam selection questions
[Re: LaRoy Engines]
#2343165
07/25/17 05:24 PM
07/25/17 05:24 PM
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Joined: Aug 2007
Posts: 732 USA
440mopar
OP
super stock
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OP
super stock
Joined: Aug 2007
Posts: 732
USA
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Why do you have an "engine guy" you don't trust to pick a cam for you? Who said I don't trust him or that he is picking the cam for me? I am having him build the engine for me whatever way I choose to have it built. I had him build an engine for me previously and he did a fine job. I just asked him for his opinion on a cam just as I am asking people here for their opinions.
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Re: Cam selection questions
[Re: AndyF]
#2343171
07/25/17 05:31 PM
07/25/17 05:31 PM
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Joined: Aug 2007
Posts: 732 USA
440mopar
OP
super stock
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OP
super stock
Joined: Aug 2007
Posts: 732
USA
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Did you read this article in the tech archives? I spent a bunch of time and money testing cams in my low deck stroker. Swapped them all into the engine and then drove the car on the street and tested then on the chassis dyno. With my engine I couldn't get much larger than the Mopar .528 before the losses outweighed the gains. http://www.moparts.org/Tech/Archive/bb/Lobe.html No Andy, I didn't. I will though. Thanks.
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Re: Cam selection questions
[Re: 440mopar]
#2344449
07/27/17 07:06 PM
07/27/17 07:06 PM
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Joined: Oct 2007
Posts: 4,210 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,210
New York
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Delay the lift choice until you decide yes/no to roller rockers.
I would like to have a fairly lumpy sounding cam Cross the #5 & 7 plug wires.
Boffin Emeritus
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Re: Cam selection questions
[Re: 440mopar]
#2344643
07/28/17 01:19 AM
07/28/17 01:19 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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On my street car with a 10.6 comp 493 I run a solid flat tappet that 264 & 270 @ .050 with .585 & .592 lift and it has a perfect idle to me as its a little lumpy but not much. It drives great and idles good in drive. Has no stumble at all and has great throttle response at all rpm's. I would have no problem with the 260/264 duration at .050 provided the rest of the cam is ground right for the combo. Mine has a 110 LSA and I have it in the eng on a 106 ICL. Dwayne Porter speced my cam because I wanted a cam to work good with my combo and he is one of the best you could get to spec a cam for your combo. I could have picked a cam myself as I know alot about cams but I am not a pro at it like Dwayne who does it everyday and he dyno's most engines so he see's what works and what dont. As I said earlier I would talk to him as if you want the right cam for your combo he is the man to talk to. Ron
Last edited by 383man; 07/28/17 01:19 AM.
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