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Mopar rb fireing order change
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DRR Trophy
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I understand some Chev racers change cam for another firing order On Mopar #7 and #4 are exchange to do this. I understand benefits for this, what is the downside if any?
 
Posts: 19 | Location: st paul mn | Registered: May 05, 2003Reply With QuoteReport This Post
DRR Sportsman
Picture of sr4440
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quote:
Originally posted by Duane:
I understand some Chev racers change cam for another firing order On Mopar #7 and #4 are exchange to do this. I understand benefits for this, what is the downside if any?


Cost of the cam.


Joe


Without data, you’re just another guy with an opinion.
 
Posts: 1289 | Location: TEXAS | Registered: February 07, 2003Reply With QuoteReport This Post
DRR Sportsman
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Usually it's only 25-30 bucks and it's "supposed" to help the harmonics. There is also the LS firing order that swaps 2 & 3 also for about the same cost. Just make sure you write it down we have some 7-4 swap cams and I always have to write it down.
 
Posts: 586 | Location: nw ohio | Registered: November 20, 2001Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by HR3377:
Usually it's only 25-30 bucks and it's "supposed" to help the harmonics. There is also the LS firing order that swaps 2 & 3 also for about the same cost. Just make sure you write it down we have some 7-4 swap cams and I always have to write it down.


$25 more for a dodge? if this is true where do you get one? because a 4-7 and 2-3 is a custom cam for a mopar. I hope i am wrong and you can tell me go to xxxxx and get one.

Joe


Without data, you’re just another guy with an opinion.
 
Posts: 1289 | Location: TEXAS | Registered: February 07, 2003Reply With QuoteReport This Post
DRR Trophy
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http://www.jonescams.com does it for the stated small price increase.
 
Posts: 81 | Location: behind this screen | Registered: July 30, 2015Reply With QuoteReport This Post
DRR Sportsman
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Don't beat me up on this but I've used Herbert cams for a few builds, but yea these were chevy motors too. Just thought if they do it for them the other brands would be the same? Might be worth a phone call to them.
 
Posts: 586 | Location: nw ohio | Registered: November 20, 2001Reply With QuoteReport This Post
DRR S/Pro
Picture of David Covey
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Bullet. Just had a cam ground for my 572. 1.9 spread lifter bore, 7-4, 2-3 swap, used a hemi round lobe blank. Roughly 600.00. John Partridge ext 101 is their mopar guru.

Dave


"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
 
Posts: 3274 | Location: American By Birth Texan By The Grace Of God  | Registered: April 29, 2004Reply With QuoteReport This Post



DRR S/Pro
Picture of David Covey
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quote:
Originally posted by HR3377:
Don't beat me up on this but I've used Herbert cams for a few builds, but yea these were chevy motors too. Just thought if they do it for them the other brands would be the same? Might be worth a phone call to them.


When I ran Super Street, I ran a herbert roller. I had their cam, lifters, and springs. Ran the lifters for 10 years. Took them out because I felt guilty. Gave the cam to a buddy which he ran until I think a rod took it out. Springs were the same as the lifters, changed them because of guilt. Eventually went with Crane cam, PSI springs and unfortunately comp rollers. Rollers were biggest mistake of racing career, cost me 4 cams and lifter sets.
Dave


"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
 
Posts: 3274 | Location: American By Birth Texan By The Grace Of God  | Registered: April 29, 2004Reply With QuoteReport This Post
DRR Sportsman
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quote:
what is the downside if any?


I have been running 4/7 and 2/3 4/7 swap BBM cams for many years. The ONLY downside is when blanks are hard to come by and the additional costs. On occasion Wedge head blanks get harderd to come by especially in 55 and 60 MM versions.


"I am not ashamed to confess I am ignorant of what I do not know."
Marcus Tullius Cicero
 
Posts: 947 | Location: Las Vegas, NV | Registered: April 14, 2004Reply With QuoteReport This Post
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