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01-04-2005, 12:00 PM
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#1
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bolt mains
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Registered User
Join Date: Sep 2004
City: Alabama
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Alright guys a couple of question for you engine guru's. I was looking at 2 and 4 bolt main stuff because this guy at work keeps saying hes going to build a car and the only thing he knows about it is that he wants a chevy 4 bolt main. So anyway, I see now after doing some google research that the 4 bolt main means that there is 4 bolts holding the crankshaft in place. This is what I want to know,
What is that purpose of the 4 bolt main?
I think I know but I just want to make sure.
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Just living out the blessings Gods given me, one mile at a time!
So many Struggles, So many Trials, So many reasons for me to Fall, But I have all Strength, And I have all Power, And I will Bury You!
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01-04-2005, 12:47 PM
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#2
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I SMOKE HYBRIDS
Join Date: Jul 2004
City: Thousand oaks, California
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It is a stronger block. I have heard of some new trucks having six bolt mains. (I think it was dodge  ) The ar302 block or whatever is a 4 bolt main. Really good block.
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I have an 01GT w/ frpp 3:73's, sportline springs, wms cold-air w/95mm mass-air, (ceramic) BBK equal length headers (ceramic) mac 70mm t. body, trickflow intake plenium, mac pro-chamber, flowmaster catback, Nitto drags, NX N20 150hp jets, & some good predator tuning! Best E.T. 11.79 @ 118.4mph 
[IMG]C:\Documents and Settings\jon.straszewski\Desktop\TOP shity to bar 020.JPG[/IMG]
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01-04-2005, 01:12 PM
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#3
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Registered User
Join Date: Sep 2004
City: Alabama
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So some of our 302's have 4 bolt mains?
__________________
Just living out the blessings Gods given me, one mile at a time!
So many Struggles, So many Trials, So many reasons for me to Fall, But I have all Strength, And I have all Power, And I will Bury You!
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01-04-2005, 01:27 PM
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#4
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WTF^^...
Join Date: May 2003
City: Birmingham / Florence
State: Alabama
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its to make it stronger, not sure on 302s
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2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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01-04-2005, 01:33 PM
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#5
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I SMOKE HYBRIDS
Join Date: Jul 2004
City: Thousand oaks, California
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No, all ford stock 302's come with 2 bolt main. Most the chevy's including (i think) the 305 come with four bolt mains. Don't know why ford did that. But they are still pretty strong.
__________________
I have an 01GT w/ frpp 3:73's, sportline springs, wms cold-air w/95mm mass-air, (ceramic) BBK equal length headers (ceramic) mac 70mm t. body, trickflow intake plenium, mac pro-chamber, flowmaster catback, Nitto drags, NX N20 150hp jets, & some good predator tuning! Best E.T. 11.79 @ 118.4mph
[IMG]C:\Documents and Settings\jon.straszewski\Desktop\TOP shity to bar 020.JPG[/IMG]
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01-04-2005, 01:43 PM
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#6
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WTF^^...
Join Date: May 2003
City: Birmingham / Florence
State: Alabama
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if you put it together with good parts it will take 500rwhp before you need to worry about the block
__________________
2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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01-04-2005, 01:59 PM
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#7
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I SMOKE HYBRIDS
Join Date: Jul 2004
City: Thousand oaks, California
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__________________
I have an 01GT w/ frpp 3:73's, sportline springs, wms cold-air w/95mm mass-air, (ceramic) BBK equal length headers (ceramic) mac 70mm t. body, trickflow intake plenium, mac pro-chamber, flowmaster catback, Nitto drags, NX N20 150hp jets, & some good predator tuning! Best E.T. 11.79 @ 118.4mph
[IMG]C:\Documents and Settings\jon.straszewski\Desktop\TOP shity to bar 020.JPG[/IMG]
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02-24-2005, 11:39 PM
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#8
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ME hometown supporter
Join Date: Feb 2005
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State: Alabama
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I dunno, its a design aspect, 4 bolt is better, but ford typically uses a larger bolt and only 2 of them, you won't need 4 bolt mains unless your building a monster 
they have 4 bolt main kits that are basically new endcaps, you just have to have your block tapped for the extra bolts, they have lots of block strentheners for the 302, since its typically the weakest link, lots of products that make the block stronger, some work, some not so much, not too experienced with 4 bolt mains on a 302
most people use the 2 vrs 4 bolt main thing as a way to measure the overall strength of a block, especially chevy, because the stronger blocks come with 4 bolt, the econo versions come with 2 bolt mains.
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