2 bolt studded mains versu 4 bolt main conversion on 496

Old 08-09-2007, 03:19 PM
  #1  
keb1
Junior Member
APPRENTICE
Thread Starter
 
Join Date: Apr 2006
Posts: 15
Default 2 bolt studded mains versu 4 bolt main conversion on 496

My engine builder claims I can save about $500 if
I just have him install a 2 bolt ARP stud kit on my block
rather than have my current 454 2 bolt main block machined for a 4 bolt main cap conversion.
He already purchased a complete Eagle competition rotating kit.
The pistons are "JE" about 12 1/2 to 1 with my current GM 990 cast iron heads.
My Long range plans call for Dart oval port heads / intake.
I don't plan on going past 6,500 thu the traps.
Am I making a smart or stupid decision?
keb1 is offline  
Old 08-09-2007, 05:55 PM
  #2  
edvancedengines
Senior Member
DYNO OPERATOR
 
Join Date: Feb 2006
Location: VA Hospital, Dallas, Tx (214 302 1924) cell-972-464-7400
Posts: 540
Default

I agree with your machinist.

Yes splayed caps are better and are stronger. 4 bolt caps are nice to have in there. No doubt both are better.

BUT!

Back in 1984 I ran 154 mph with a 2,960 lb car using great heads and a 2 bolt Main chevy car block with two sleeved cylinders as a 461 cu in 16.85 -1 compression , and I kept it at 8,000 rpm all the time. When I was done with it after it going a 7.87 in a 2300 lb x-top fuel car I sold the short block minus cam for $500.00 and it went in a front engined alcohol dragster and he ran it several years, so it must not have been hurt. In case you have not figured it yet, that is over 1,000 hp with a stock 2 bolt block.

I would run it like your machinist suggests unless the money for the better caps is no big thing.

Ed
edvancedengines is offline  
Old 08-09-2007, 06:29 PM
  #3  
topsportsman1
Administrator
RACING JUNKIE
 
Join Date: Mar 2004
Location: Maine,USA
Posts: 1,208
Default

I'd agree with what Ed is saying,I too have run a 2 bolt block with good results.

Tom
__________________
There Is 1 Thing Better Than Cubic Inches,,,More Of Them
topsportsman1 is offline  
Old 08-09-2007, 06:35 PM
  #4  
signsbyesa
Senior Member
RACING JUNKIE
 
Join Date: Feb 2004
Location: san antonio, texas
Posts: 1,233
Default

for mild racing 2 bolts work, i had my machinist align bore a 4 bolt
on my bbc, remember that crank is just trying to bust out of the
block with alot of torque. 8)
signsbyesa is offline  
Old 08-09-2007, 10:22 PM
  #5  
cepx111
Senior Member
RACING JUNKIE
 
Join Date: May 2006
Posts: 2,044
Default

I went one step further with my 454 2 bolt block, I installed studs and a main cap stud guirdle. Its an old small block ford trick but it really helps to stablize the bottem end and prevent cap walk. I scored mine with the studs and hardware for about 100 bucks on ebay. The studs are long enough that I can use a windage tray too. Charles
cepx111 is offline  
Old 08-13-2007, 03:41 PM
  #6  
gyrogearloose
Member
MASTER JOURNEYMAN
 
Join Date: Oct 2004
Posts: 36
Default Two bolt mains

Originally Posted by edvancedengines
I agree with your machinist.

Yes splayed caps are better and are stronger. 4 bolt caps are nice to have in there. No doubt both are better.

BUT!

Back in 1984 I ran 154 mph with a 2,960 lb car using great heads and a 2 bolt Main chevy car block with two sleeved cylinders as a 461 cu in 16.85 -1 compression , and I kept it at 8,000 rpm all the time. When I was done with it after it going a 7.87 in a 2300 lb x-top fuel car I sold the short block minus cam for $500.00 and it went in a front engined alcohol dragster and he ran it several years, so it must not have been hurt. In case you have not figured it yet, that is over 1,000 hp with a stock 2 bolt block.

I would run it like your machinist suggests unless the money for the better caps is no big thing.

Ed
I can't top your feat Ed, but we ran a 475 for three years using a two bolt main pass car block with an ARP stud kit, Eagle crank and rods, JE pistons with 14.5 to 1 compression. Dart 310 heads. 821 HP on alky. Car weight was 2731 and we ran it hard, 8000 rpms through the traps. No problem with it at all. The only reason we stopped using it was the bores got wore to the point that we couldn't hone it clean anymore. And we did have a heating problem with it if we had to idle too long at the line or staging lanes that we decided not to use it anymore. (Was told that the cylinder walls too thin is what caused the heating problem.)
But the block with the two bolt main held together just fine.
gyrogearloose is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service