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Re: Please Help Me Pick a Cam for my 511"
[Re: Sport440]
#1578275
02/19/14 02:53 AM
02/19/14 02:53 AM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
Quote:
Thanks for the info gentlemen. I am limited to a 275/60/15 tire so that is something to consider. That said I am just having fun not looking to break and records or win any of the classes. Just an occasional blast down the strip and plenty of street. I am not worried about getting th car to launch as I will employ a three step timing control and a trick clutch setup.
So far I have this recommendation:
275-300lbs on the seat, and 700-750lbs open
.783"-Intake and .770"-Exhaust.
286/291 @.050"
111 LSA
This recommendation was made based on the tire size, weight, and intended use of my beater. I am looking to put a Lenco behind it fwiw.
Who the helw gave you that recommendation? Thats Wayyy to big for your 10.8 comp.
Your going to want something around 265 to 270 @ .050 in a roller. Closer to 265 IMO for better street manors with that stick. 
That big cam sounds more like a dedicated drag cam, for higher compression. Also, With that large a cam, I think you need to cut deeper valve reliefs in the pistons? I don't know about the Diamond pistons, but I doubt my KB ICON pistons could handle a 270 @ 0.050" cam without milling the valve reliefs deeper.
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Re: Please Help Me Pick a Cam for my 511"
[Re: Jeremiah]
#1578276
02/19/14 03:18 AM
02/19/14 03:18 AM
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Joined: Mar 2008
Posts: 883
Affton MO
qwkmopardan
super stock
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super stock
Joined: Mar 2008
Posts: 883
Affton MO
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I would put a solid flat tappet cam like a Racer Brown STX-21. It will have .630 lift with 1.7 RAR and dur. is 272* at.050. You can get cam, lifters and springs for just a little more than a good set of springs would cost for the roller cam. Maintenance will be low and horsepower will still be very good. I have switched from solid rollers to the Racer Brown flat tappets twice, and both cars were faster, Bob Pleasant and Don Rauchs cars, both Moparts members. Adjust the valves once a year and have fun. I have a STX-22, [.629" lift-276* at .050], in my LeBaron, in an INDY SR headed 512 and have been 5.44 at 126mph. Car weighs 2560 with me in it. That is over 800HP with a flat tappet cam, and cam, lifters and springs were less than $400. My demon has same STX-22 camshaft, in a small block and has over 1800 passes on it with just 2 spring changes, done with heads on engine. 
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Re: Please Help Me Pick a Cam for my 511"
[Re: qwkmopardan]
#1578277
02/19/14 11:42 AM
02/19/14 11:42 AM
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Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
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From what I am gleaning from experts the LSA on each combo is picked according to valve size per cube as a basic bench mark, along with compression, and a couple of other inputs?
That's why I am going to put in another plug for Dwayne Porter. There are endurance springs and cam lobes that will work for you, and a pro needs to pick the combo for best results.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Please Help Me Pick a Cam for my 511"
[Re: 451Mopar]
#1578278
02/19/14 11:47 AM
02/19/14 11:47 AM
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Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
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Quote:
Quote:
Quote:
Thanks for the info gentlemen. I am limited to a 275/60/15 tire so that is something to consider. That said I am just having fun not looking to break and records or win any of the classes. Just an occasional blast down the strip and plenty of street. I am not worried about getting th car to launch as I will employ a three step timing control and a trick clutch setup.
So far I have this recommendation:
275-300lbs on the seat, and 700-750lbs open
.783"-Intake and .770"-Exhaust.
286/291 @.050"
111 LSA
This recommendation was made based on the tire size, weight, and intended use of my beater. I am looking to put a Lenco behind it fwiw.
Who the helw gave you that recommendation? Thats Wayyy to big for your 10.8 comp.
Your going to want something around 265 to 270 @ .050 in a roller. Closer to 265 IMO for better street manors with that stick.
That big cam sounds more like a dedicated drag cam, for higher compression. Also, With that large a cam, I think you need to cut deeper valve reliefs in the pistons? I don't know about the Diamond pistons, but I doubt my KB ICON pistons could handle a 270 @ 0.050" cam without milling the valve reliefs deeper.
I have less cam than that in my 528 with 15/1 compression! On top of that ,some cam programs call for a narrower LSA, and less duration than I have now, which is 283 intake. I originally made 847 hp with a 278 @ .050 intake lobe with 15/1 compression.
Most of us gat into the bigger is better mind set, and your cam recommendation will most likely come back looking small, but trust the guy you pick to chose it.
Last edited by gregsdart; 02/19/14 11:54 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Please Help Me Pick a Cam for my 511"
[Re: Jeremiah]
#1578279
02/19/14 12:04 PM
02/19/14 12:04 PM
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Joined: Jan 2003
Posts: 13,369
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,369
Marion, South Carolina [><]
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One phone call to Dwayne Porter is all you need. 802-951-1955
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Please Help Me Pick a Cam for my 511"
[Re: 451Mopar]
#1578280
02/19/14 12:48 PM
02/19/14 12:48 PM
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Joined: May 2010
Posts: 485
Central California
MoParFish
mopar
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mopar
Joined: May 2010
Posts: 485
Central California
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Quote:
I doubt my KB ICON pistons could handle a 270 @ 0.050" cam without milling the valve reliefs deeper.
My flat top ICONS cleared but not much room to spare. 274/280@.050 .674 gross lift. 2.25/1.81 MW Victor .010 deck .039 gasket. 
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Re: Please Help Me Pick a Cam for my 511"
[Re: an8sec70cuda]
#1578281
02/19/14 08:37 PM
02/19/14 08:37 PM
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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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Quote:
One phone call to Dwayne Porter is all you need. 802-951-1955
Ron
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Re: Please Help Me Pick a Cam for my 511"
[Re: Jeremiah]
#1578282
02/20/14 03:14 PM
02/20/14 03:14 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
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Not sure why my thread died. Hopefully I didn't upset anyone.
Probably because you were getting basically the same cam recommendations from multiple sources. There wasn't much to add, short of hearing what your final decision was. 
FWIW, on going w/ bigger tires.
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