Re: 4 bolt main cap conversion on a 440
[Re: A47]
#888495
12/26/10 11:55 AM
12/26/10 11:55 AM
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Joined: Sep 2005
Posts: 1,328 St. Louis, MO
mopardamo
pro stock
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pro stock
Joined: Sep 2005
Posts: 1,328
St. Louis, MO
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Hello & Merry Christmas, I would put AL caps on and be done with it unless you are going to make under 500 hp. Then stick with the stock caps. Cannot do any better unless the block is upgraded. Damon
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Re: 4 bolt main cap conversion on a 440
[Re: A47]
#888496
12/26/10 03:01 PM
12/26/10 03:01 PM
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Joined: Aug 2003
Posts: 43,277 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,277
Bend,OR USA
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I agree with AHY on this, use either a set of ductile iron or aluminum caps and a good set of studs for builds above 600 HP I like and use the Mopar brand of ductile iron caps, I'm not sure if you can still get them or not I am a member of the 500, 600, 700, 800 and 900+ HP HP pump gas club All using Mopar Ductile iron caps Stay away from drilling or machining holes through the side of the block to use side bolts Look at that very closely and then about it If you want a block with four bolt mains buy a new one
Last edited by Cab_Burge; 12/26/10 03:02 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 4 bolt main cap conversion on a 440
[Re: thehemikid]
#888499
12/27/10 08:52 AM
12/27/10 08:52 AM
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Joined: Nov 2005
Posts: 384 under the hood
A47
OP
enthusiast
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OP
enthusiast
Joined: Nov 2005
Posts: 384
under the hood
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thanks guys for the info pictures replies & stuff , its been greatly appreciated !! yeah could go aftermarket 4 bolt mains block , but , thinking would be easier on bank account , it i could make use of this 71 block , i know power & cheap don't really go in the same sentance ! , these aluminum main caps ! something is bothering me !! don't laugh Guys , i know my way around engines & rebuilt a good few over the years , but will never know half as much as you guys on here , wont the aluminum main caps expand different to the cast iron block ! & change bearing clearences !! yeah said you would laugh ,
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Re: 4 bolt main cap conversion on a 440
[Re: roadrunninMark]
#888500
12/27/10 09:23 AM
12/27/10 09:23 AM
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Joined: Feb 2007
Posts: 6,295 U.S.
moparniac
master
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master
Joined: Feb 2007
Posts: 6,295
U.S.
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how much are the caps and how much would the machining be for the whole process!
Mopar Performance
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Re: 4 bolt main cap conversion on a 440
[Re: A47]
#888502
12/27/10 11:08 AM
12/27/10 11:08 AM
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Joined: Nov 2005
Posts: 384 under the hood
A47
OP
enthusiast
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OP
enthusiast
Joined: Nov 2005
Posts: 384
under the hood
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Quote:
thanks guys for the info pictures replies & stuff , its been greatly appreciated !! yeah could go aftermarket 4 bolt mains block , but , thinking would be easier on bank account , it i could make use of this 71 block , i know power & cheap don't really go in the same sentance ! , these aluminum main caps ! something is bothering me !! don't laugh Guys , i know my way around engines & rebuilt a good few over the years , but will never know half as much as you guys on here , wont the aluminum main caps expand different to the cast iron block ! & change bearing clearences !! yeah said you would laugh ,
also what about aluminum caps in a motor that will spend lot of time on the street ,
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Re: 4 bolt main cap conversion on a 440
[Re: A47]
#888503
12/27/10 05:02 PM
12/27/10 05:02 PM
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Joined: Sep 2009
Posts: 1,805 ky hills
thehemikid
top fuel
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top fuel
Joined: Sep 2009
Posts: 1,805
ky hills
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Quote:
Quote:
thanks guys for the info pictures replies & stuff , its been greatly appreciated !! yeah could go aftermarket 4 bolt mains block , but , thinking would be easier on bank account , it i could make use of this 71 block , i know power & cheap don't really go in the same sentance ! , these aluminum main caps ! something is bothering me !! don't laugh Guys , i know my way around engines & rebuilt a good few over the years , but will never know half as much as you guys on here , wont the aluminum main caps expand different to the cast iron block ! & change bearing clearences !! yeah said you would laugh ,
also what about aluminum caps in a motor that will spend lot of time on the street ,
...The street was what I built that AL cap'd block for, but health got in the way & I didn't get to find out. Yeah, it'd be nice to hear someone say, "been there done that, no probemo", & I bet there is. Hopefully someone chimes in.
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Re: 4 bolt main cap conversion on a 440
[Re: mopardamo]
#888505
12/27/10 09:40 PM
12/27/10 09:40 PM
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Joined: Dec 2005
Posts: 121 mid-mich
turboplymouth
member
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member
Joined: Dec 2005
Posts: 121
mid-mich
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I have 3 seasons on my AL caps. Probably 2500 driven miles and 25 1/4 mile passes, plus quite a few "street passes". You can take a guess on the hp based on the #'s in sig.
Last edited by turboplymouth; 12/27/10 09:41 PM.
'72 Scamp, 3500#, 440, S400, blowthrough, meth. inj.
9.78 @ 139 so far at 12 psi, 11.00 @ 131 on real street tires.
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Re: 4 bolt main cap conversion on a 440
[Re: turboplymouth]
#888506
12/27/10 10:05 PM
12/27/10 10:05 PM
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Joined: Nov 2003
Posts: 5,160 Texas
dannysbee
master
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master
Joined: Nov 2003
Posts: 5,160
Texas
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They do aluminum blocks with steel caps all the time and there does not seem to be any problems there with the different expansion of materials.
Getting old just means you were smarter than some and luckier than others.
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Re: 4 bolt main cap conversion on a 440
[Re: A47]
#888508
12/28/10 09:22 AM
12/28/10 09:22 AM
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Joined: Jan 2003
Posts: 10,015 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,015
Frostbitefalls MN (Rocky&Bullw...
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My experience has been that total rotating assembly weight is as important as how you choose to strengthen the block. The next motor I get is going to have aluminum rods, the lightest piston I can come up with and a low deck race block from KB. My last choice would be what i have now, a four bolt Megablock with a 2432 bob weight. I don't like the idea of a conversion four bolt kit simply based on the fact that I have hurt a better four bolt combo, the factory four bolt race block. The best choice for a stock type 440 block IMHO would get a set of aluminum caps, and I would spend as much or more money on light parts to keep the bob weight as low as possible.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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