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Aluminum Main Caps ? #2675838
07/09/19 04:29 AM
07/09/19 04:29 AM
Joined: Jul 2011
Posts: 16
new zealand
7
70wayfarer Offline OP
member
70wayfarer  Offline OP
member
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Joined: Jul 2011
Posts: 16
new zealand
i'm thinking of doing aluminum main caps on my 440/493 stroker, chasing 700-750 hp. what are the real world advantages, if any. it was suggested to do ali caps and timing belt to help with block damaging harmonics.
BCR and 440 sourse both do ali caps and both claim theirs are the ducks nuts.
any advice on this much appreciated. car will see mainly strip duty. TIA

Last edited by 70wayfarer; 07/09/19 04:30 AM.
Re: Aluminum Main Caps ? [Re: 70wayfarer] #2675880
07/09/19 09:04 AM
07/09/19 09:04 AM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
B
BradH Offline
Taking time off to work on my car
BradH  Offline
Taking time off to work on my car
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
Use the search feature and you'll likely get multiple threads that discuss the topic in more detail.

Re 440 Source vs BCR... I don't know that's even a valid comparison. I would have used BCR caps had they been available when my block work was done. If someone gave me that other brand's cap kit, they would still be in the box on my parts shelf.

Re: Aluminum Main Caps ? [Re: BradH] #2675886
07/09/19 09:36 AM
07/09/19 09:36 AM
Joined: Oct 2005
Posts: 8,828
Ontario, Canada
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Stanton Offline
Don't question me!
Stanton  Offline
Don't question me!
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Posts: 8,828
Ontario, Canada
The 440Source caps are not machined to the proper bore size for RB's, they're made for low deck blocks. So unless you're a machinist you'll spend more on those and subsequent machining than you would buying BCR's in the first place.

Re: Aluminum Main Caps ? [Re: 70wayfarer] #2675895
07/09/19 09:57 AM
07/09/19 09:57 AM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline
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451Mopar  Offline
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
I have the BCR aluminum caps and girdle. It is a nice setup, with all the hardware.
Shop around for machine work of fitting the caps to the block. Places I called were all over the place on cost, and not all shops can perform the work.
The BCR caps are designed to be used with their girdle kit. The 1/2" thick girdle will require a bit of extra work setting up the oil pickup tube if using the internal oil pickup.

Re: Aluminum Main Caps ? [Re: 451Mopar] #2675900
07/09/19 10:01 AM
07/09/19 10:01 AM
Joined: Jan 2012
Posts: 1,541
USA
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hudsonhornet7x Offline
pro stock
hudsonhornet7x  Offline
pro stock
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Joined: Jan 2012
Posts: 1,541
USA
I have owned both, and hands down the BCR setup with girdle was a much nicer piece. That is they way I would go.

Re: Aluminum Main Caps ? [Re: hudsonhornet7x] #2675925
07/09/19 10:52 AM
07/09/19 10:52 AM
Joined: Jan 2003
Posts: 6,988
Warren, MI
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Jerry Offline
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Jerry  Offline
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Joined: Jan 2003
Posts: 6,988
Warren, MI
the biggest difference between our caps and the 440 source aluminum caps, is that ours are machined here in Michigan, and are backed and supported by a Michigan company. also all of our material comes from ohio, I could drive down and touch and see where its made if I wanted to. there is a lot to be said for usa made quality materials.


Superior Design Concepts
2574 Elliott Dr
Troy MI 48083
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Facebook page: Superior Design Concepts
www.bcrproducts.com
Re: Aluminum Main Caps ? [Re: 70wayfarer] #2675960
07/09/19 12:20 PM
07/09/19 12:20 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,007
Bend,OR USA
I have several different race motors and pump gas street motors with the 440 Source caps on them, both low deck and high deck motors, with no girdles and no problems so far shruggy
I have a customers motor in the shop now that has the original BCR cap and girdle and it looks a lot nicer on the polished caps, if that matters to you shruggy
I'm not a fan of using steel bolt on main girdles or any other type of girdles on Mopar BB twocents The girdles will not stop the main webbing from cracking work shruggy
I use to only use the ductile iron main cap kits form Mopar but when they stop offering them I had to switch to another type whiney


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Aluminum Main Caps ? [Re: Cab_Burge] #2676017
07/09/19 03:30 PM
07/09/19 03:30 PM
Joined: Jul 2011
Posts: 16
new zealand
7
70wayfarer Offline OP
member
70wayfarer  Offline OP
member
7

Joined: Jul 2011
Posts: 16
new zealand
ok then. thanks for the input guys. good info on both sides of the fence.

Re: Aluminum Main Caps ? [Re: 70wayfarer] #2676807
07/12/19 12:50 PM
07/12/19 12:50 PM
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines Offline
master
CompWedgeEngines  Offline
master

Joined: Nov 2004
Posts: 3,544
Syracuse,NY
There are some other choices out there as well, where you can receive customer service. PM me if need be,.


RIP Monte Smith

Your work is a reflection of yourself, autograph it with quality.

WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.






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