Re: Girdle and aluminum main caps
[Re: Jerry]
#3094054
11/14/22 01:00 AM
11/14/22 01:00 AM
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Joined: Oct 2006
Posts: 1,264 New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,264
New York, USA
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i've got the bcr girdle kits in stock. This is am extremely well designed kit. It does require some add’l machining but i think out of all of the girdle kits, this one is the best. I used it on a guys stock RB block that made 741 Hp on dyno with -1 heads. Very nice quality design kit. And I might add great customer service. When the machine shop misplaced the girdle specs/instructions, i called and got them on the phone right away and they made sure I got the details. That’s super in my book!
Last edited by Chargerfan68; 11/14/22 01:08 AM.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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Re: Girdle and aluminum main caps
[Re: GTXMEX]
#3094064
11/14/22 03:11 AM
11/14/22 03:11 AM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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I've drag race and built BB Mopars since the early 1970s, for your deal you don't buy and use any girdle Aluminum main caps and ARP main studs is overkill in my opinion for any B/RB Mopar V8 engine making under 700 HP on gasoline The Mopar BB and the Ford FE engines have a lot more strength in the main bearing area due to the additional cast iron under the main webbing going to the oil pan rails Look very closely at any after market girdle that cuts into the block reducing the stock block strengths, the main studs that don't have an interference machine fit into the girdles do nothing other than add additional costs to your build, same thing on the oil pan studs You would be better off building a 400 block that sonic tests good due to all of them (400 blocks) having thicker main webbing than any of the stock OEM production 440 blocks, I've had to throw away 5 RB blocks due to them cracking between the bottom of the cylinders and the main webbing after racing them for several years: whiney: I've heard of some of the 383 and 361 blocks doing that also, no 400 blocks though, yet Buy the aluminum main caps and ARP studs and have any block sonic tested before using it for a race motor making north of 700 HP on gasoline
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Girdle and aluminum main caps
[Re: GTXMEX]
#3094173
11/14/22 03:34 PM
11/14/22 03:34 PM
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Joined: Oct 2007
Posts: 4,212 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,212
New York
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Please remember that the purpose of a girdle is to reduce distortion and retain all components in the correct locations. This is bending resistance, not strength. This is a function of the material's "Young's modulus of elasticity", aluminum is about 10 million psi, most iron products are about 30 million psi. An aluminum girdle must be much thicker than steel or iron to have the same effect.
Boffin Emeritus
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Re: Girdle and aluminum main caps
[Re: polyspheric]
#3094182
11/14/22 04:27 PM
11/14/22 04:27 PM
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Joined: Oct 2006
Posts: 1,264 New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,264
New York, USA
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Please remember that the purpose of a girdle is to reduce distortion and retain all components in the correct locations. This is bending resistance, not strength. This is a function of the material's "Young's modulus of elasticity", aluminum is about 10 million psi, most iron products are about 30 million psi. An aluminum girdle must be much thicker than steel or iron to have the same effect. Just to point out that the girdle is steel. It is “beefy”. Only the caps are aluminum.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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Re: Girdle and aluminum main caps
[Re: polyspheric]
#3094222
11/14/22 09:02 PM
11/14/22 09:02 PM
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Joined: Aug 2009
Posts: 2,054 Mooresburg, Tn
'72CudaRacer
top fuel
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top fuel
Joined: Aug 2009
Posts: 2,054
Mooresburg, Tn
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I run the BCR cap & girdle set up in my Cuda, along with the Milodon SS oil pan (the one with the steering link passing through the pan). I also run a front motor plate, but the engine is in the same place as with the stock mounts. I don't have any problem with clearance because of the girdle. The big difference between BCR set up and everyone else's, BRC attaches the girdle with separate studs, not longer main studs. Some people disagree with this thought process, but to me, it can't hurt. It has to be better than doing nothing. And it makes me feel good.
Brian
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Re: Girdle and aluminum main caps
[Re: '72CudaRacer]
#3094224
11/14/22 09:15 PM
11/14/22 09:15 PM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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As long as you sleep better at night I guess that’s all you can ask for. For me I’m going to put the money it cost for stock block work, machine cost in fitting a girdle, plus the cost of the girdle towards a REAL race block. Good luck
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Girdle and aluminum main caps
[Re: pittsburghracer]
#3094236
11/14/22 09:52 PM
11/14/22 09:52 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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[quote=pittsburghracer] As long as you sleep better at night I guess that’s all you can ask for. For me I’m going to put the money it cost for stock block work, machine cost in fitting a girdle, plus the cost of the girdle towards a REAL race block. Good luck [/quote My last 400 block race only stroker motor had 15.2 to 1 compression ratio and I raced it on pump E85, it ran a best of 5.50 ET in the 1/8 mile at 125.6 MPH, 8.86 at 150.5 MPH in the 1/4 mile weighing 2850 Lbs. with me in it, you can do the math for the HP it made . It had a set of 440 Source aluminum main caps with ARP main studs with my homemade crank scraper and a stock type windage tray, the aftermarket race SS style oil pan held over 12 quarts of oil but I ran it with 10 or 11 quarts and never had a oiling issue racing it with VR1 10x30 Wt racing oil.
Last edited by Cab_Burge; 11/14/22 09:53 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Girdle and aluminum main caps
[Re: jwb123]
#3094611
11/16/22 11:26 AM
11/16/22 11:26 AM
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Joined: Dec 2021
Posts: 1,185 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,185
Loudoun County, VA
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My current 440 block had the cross-bolted 2/3/4 caps installed a couple of rebuilds ago. Even with an engine that only put at around 600 HP at its peak, there are signs of the bottom of the main caps that things are still moving around a little bit. Now it's gonna have to handle another 50+ HP and more torque, too.
My backup block has been machined for standard aluminum caps, plus I decided to add an old CRE girdle (similar to Hughes and 440 Source) to help stabilize the main caps better. No, it's not as sophisticated as the BCR cap & girdle combination, but it's what I have (and it's paid for).
You can probably tie up $2500-3000 in buying and "race prepping" a 45+ years-old OEM block w/ the BCR setup, once all the costs are factored in. Based on what I found recently, it would require close to $7K to have a ready-to-assemble BMP aluminum block. I'd love a new BMP block, though.
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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