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DRR Trophy
posted
Hey guys.

I am building a new motor for this upcoming season. I have a shorty swing arm nelson car. I am building a 4.6 bore short deck big block with 345 3X heads. Question is, do i go with the 4.5 stroke 6.35 rods and build a 598, or 4.375 stroke and the 6.535 rods and build a 582. I have heard the 4.375 stroke will outrun and out last the bigger stroke with the short deck. I just need to know what combo you think is better for reliability and efficiency,

Thanks for the comments in advance
 
Posts: 31 | Location: arkansas | Registered: August 25, 2011Reply With QuoteReport This Post
DRR Elite
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I'd be more concern about who's building it when the question is reliability and if it must be a short deck build the 598, about the same price as a 582 but more power. That said, I wouldn't build either of those combos today. The most common engines in dragsters today are 615 and 632 and both go hundreds of passes before being freshened.
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Trophy
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Hey ED. Glad you replied. I only have a short deck block so can't really go bigger than the 4.5 stroke.
 
Posts: 31 | Location: arkansas | Registered: August 25, 2011Reply With QuoteReport This Post
DRR Top Comp
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quote:
Originally posted by 66belair:
Hey guys.

I am building a new motor for this upcoming season. I have a shorty swing arm nelson car. I am building a 4.6 bore short deck big block with 345 3X heads. Question is, do i go with the 4.5 stroke 6.35 rods and build a 598, or 4.375 stroke and the 6.535 rods and build a 582. I have heard the 4.375 stroke will outrun and out last the bigger stroke with the short deck. I just need to know what combo you think is better for reliability and efficiency,

Thanks for the comments in advance


Local has a 585 going 4.30's 4.40's n/a. 4 link dragster.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Pro
Picture of Goob
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I'd go with the 582 with those cylinder heads.
I think that's the upper end of your flow capabilities. Great heads for a 555-565


"Despite the high cost of living, it remains popular."
Dave Cook
N375
 
Posts: 1860 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post
DRR S/Pro
Picture of Big Steve
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With those heads I would consider a 565, 4.250 crank and 6.535 rods, It has a better rod ratio and a 565 will make close to the same HP as a 582. My 565 with cnc 345 Dart heads ran consistent 4.7x with a best of 4.68 at 2000 lbs.
JMO
 
Posts: 2551 | Location: Moving back to the door side | Registered: April 30, 2010Reply With QuoteReport This Post
DRR Elite
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I missed the heads. If you are building a new engine around these heads, I agree with Big Steve
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post



DRR S/Pro
Picture of SCDIV1
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My 584 with similar heads does not run as fast as it did previously as a 565 with the same heads, cam and intake.

4.610 x 4.375 + .400 rods 584
4.600 x 4.250 + .400 rods 565

I had a new custom grind cam cut for the 584 and did some head porting but that was never put back together and run

582’s and up generally like Head Hunter heads or 375X’s or something in that intake runner size in a conventional head.

The 565 shorter stroke combos run better and I have friends who have said the same thing with their experiences
 
Posts: 2735 | Location: Where ever I am, I'm here and it's me | Registered: March 15, 2007Reply With QuoteReport This Post
DRR Sportsman
Picture of TD3550
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What intake are you thinking of?. SV Merlin,Sniper?
 
Posts: 1421 | Location: Under a Truck | Registered: August 23, 2013Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by SCDIV1:
The 565 shorter stroke combos run better and I have friends who have said the same thing with their experiences


I agree with this. Our stuff is 4.560 x 4.25 with +.400 6.535 rod and runs good, best ET of 7.32@182 / 4.64@148 with a 1.051 60. Runs faster than most of the 582 combos. I think the 4.25” stroke is a good combination.
 
Posts: 742 | Location: Upstate NY | Registered: July 02, 2013Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by 183N:
quote:
Originally posted by SCDIV1:
The 565 shorter stroke combos run better and I have friends who have said the same thing with their experiences


I agree with this. Our stuff is 4.560 x 4.25 with +.400 6.535 rod and runs good, best ET of 7.32@182 / 4.64@148 with a 1.051 60. Runs faster than most of the 582 combos. I think the 4.25” stroke is a good combination.


Gotta agree with this especially with the heads you have. My 555 runs rather well for what it is.


Denis LeBlanc

 
Posts: 509 | Location: Manchester, NH | Registered: February 03, 2006Reply With QuoteReport This Post
DRR Trophy
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I was gonna run bm 2017r brodix intake. Is there intakes better than the brodix one? Thanks for the rplies guys. This was supposed to be a 565 untill i had to buy crank, so i thought it aint no more money so id go little bigger if i could.
 
Posts: 31 | Location: arkansas | Registered: August 25, 2011Reply With QuoteReport This Post
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