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2-bolt Main To 4-bolt Main Caps?

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Old 05-24-2005, 10:35 PM
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2-bolt Main To 4-bolt Main Caps?

I was looking around the internet and ebay , and found that there are kits to convert your 2 bolt to a 4 bolt and it would be stronger than a stock 4 bolt main.

my question is, is it worth it? and how mouch would it cost to do this?

thanks!
Old 05-24-2005, 10:37 PM
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And oh, I was not thinking about doing this to my 305 .
Old 05-24-2005, 11:59 PM
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Unless you want to go over 500hp on an otherwise stock block, you probably don't need it.
Old 05-25-2005, 12:01 AM
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Originally posted by Air_Adam
Unless you want to go over 500hp on an otherwise stock block, you probably don't need it.
you stole the words right out of my chomper!
Old 05-25-2005, 12:02 AM
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a 4bolt main is prolly way more then your going to need


and yeah you could prolly do it on your own but I would also be leary about it just because knowing my lcuk I would get too close tosomethig I shouldn't and make it weaker
Old 05-25-2005, 12:16 AM
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Originally posted by rx7speed
you could prolly do it on your own
Not unless you can mill the block, drill and tap the holes and align bore the new caps in your garage.
Old 05-25-2005, 01:13 AM
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I'm still running a 2-bolt main well, not actually bolts anymore, ARP main stud kit.
Old 05-25-2005, 02:19 AM
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Originally posted by Apeiron
Not unless you can mill the block, drill and tap the holes and align bore the new caps in your garage.
eh I don't have the tools off hand for that way

do you think jb weld, duct tape and some coat hangers would work?
Old 05-25-2005, 06:42 AM
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Originally posted by rx7speed
eh I don't have the tools off hand for that way

do you think jb weld, duct tape and some coat hangers would work?
only if you have a big enough hammer.
Old 05-25-2005, 08:22 AM
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So a two bolt main is still preaty beefy then. but i was hopeing to be in the 480 ish to 500 horse power range. on a built 350 2-bolt main with out some thing breaking on me.
Old 05-25-2005, 08:55 AM
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Yes those "kits" make a block stronger than a factory 4-bolt main, by far. Factory 4-bolts aren't meant for racing. They are ineffective against that kind of stress. They're really meant for truck motors.... high load on the motor continuously, moderate RPMs.

If you're serious about the 500 HP business and it's not just a bunch of spank-off, and you want to strengthen your block, I would not recommend getting the cheap chinesium ones off of ebay. There are several USA mfrs that make a much more dependable product. For example http://store.summitracing.com/partde...rt=MIL%2D11150 Here's another thing that DRAMATICALLY stabilizes a stock block for racing type usage. http://store.summitracing.com/partde...t=HNH%2D860212
Old 05-25-2005, 05:32 PM
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thanks for the links! and thanks for your guys comments.
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