4 bolt or 2 Bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

77ChevySharkBite · 03-21-2013, 05:13 PM

I found this on craigslist here locally, I'm thinking about maybe trying to get it but I wanted to know the ways to tell a 4 bolt main to a 4 bolt main here's the link to it. I want to check the vin to check but I dont know how.

http://houston.craigslist.org/pts/3606605113.html

thanks for the help guys

INSIDIOUS '86 · 03-21-2013, 05:25 PM

500hp go for four bolt. Under that the two bolt is fine.
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77ChevySharkBite · 03-21-2013, 05:29 PM

Quote:

Originally Posted by INSIDIOUS '86

500hp go for four bolt. Under that the two bolt is fine.
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I wanted to do a 383 stroker for my truck, should I have a 4 bolt for that?

russgt · 03-21-2013, 05:47 PM

You can tell from the pictures that it is a 4 bolt main block. I would have no issues pushing a studded main 2 bolt into the 400 to 500hp range, but for anything over that you should be using an aftermarket block anyways.

77ChevySharkBite · 03-21-2013, 05:52 PM

Okay, see I didn't know how to tell the difference between them, or how to tell the difference I looked up the vin on it and it showed that it could be a 2 or 4 bolt and I figured someone here could help me out better.
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tlawre87 · 03-21-2013, 06:16 PM

Look at the main bearing caps. (The three center pieces) It has 4 bolts. A 2 bolt main will only have 2 bolts.

77ChevySharkBite · 03-21-2013, 06:21 PM

Okay I see it, so what would I need to pull off on my motor to find out if my current motor is a 2 or 4 bolt?
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GM-power · 03-21-2013, 06:40 PM

Oil pan
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77ChevySharkBite · 03-21-2013, 06:45 PM

And I'll just look for those same like 3 bolts or what?
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GM-power · 03-21-2013, 06:49 PM

Look for four bolts on top of the main bearing caps tlawre87 said.

EDIT: I saw you other thread about pitting a cam in a 305. Is the motor you trying to figure out the the main bolt number a 305 or 350? Most 305 are two bolt. There are some rare 4 bolt 305s though according to some people.

77ChevySharkBite · 03-21-2013, 06:51 PM

Alright thanks for all the replies guys!! I'm going to look into it pretty soon, can I do it with the motor still in the truck or do I need to have the motor out?
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GM-power · 03-21-2013, 07:02 PM

It can be done without pulling the motor, but you may have to loft the motor up a bit and you might not have to. Not much help but thats just the way it goes sometimes haha.
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87r10owner · 03-21-2013, 07:03 PM

I have seen several 2 bolts pushed to 600hp and I'd take a splayed 2 bolt over a for bolt any day. I always thought that was a funny subject. But to the subject question yes it's a 4 bolt which for a street motor is irrelevant. But if you plan to do something with this where you get something extra is the fact that that block is a high nickel/high tin content. Just my .02
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77ChevySharkBite · 03-21-2013, 07:03 PM

Haha I understand thanks for all the help and advice it's greatly greatly appreciated!
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77ChevySharkBite · 03-21-2013, 07:07 PM

Quote:

Originally Posted by 87r10owner

I have seen several 2 bolts pushed to 600hp and I'd take a splayed 2 bolt over a for bolt any day. I always thought that was a funny subject. But to the subject question yes it's a 4 bolt which for a street motor is irrelevant. But if you plan to do something with this where you get something extra is the fact that that block is a high nickel/high tin content. Just my .02
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Okay but these 2 bolts are they splayed like you mentioned or are they actually just the 2 bolts? My truck is mainly going to be for show and to pull my boat, but if I can push good power out of a 2 bolt I'll just keep the 2 bolt in there
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87r10owner · 03-21-2013, 07:14 PM

Just a 2bolt, and if you are not building a 500+ high rpm race motor than a 2 bolt will do any show or boat pulling you plan to do.
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77ChevySharkBite · 03-21-2013, 07:18 PM

Yeah, I'm just going to try and build a really good bottom end and have good torque and just let the HP follow it. If I want splay it, where can I get that done?
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87r10owner · 03-21-2013, 09:30 PM

Just google splayed main caps and which ever one you decide on just take them with the motor to who have do the machine work and they can install them or you can purchase from any machine shop.
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77ChevySharkBite · 03-21-2013, 09:44 PM

Alright awesome!! Thanks for all the answers I appreciate it a lot
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03-21-2013, 05:13 PM	#1
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	4 bolt or 2 Bolt I found this on craigslist here locally, I'm thinking about maybe trying to get it but I wanted to know the ways to tell a 4 bolt main to a 4 bolt main here's the link to it. I want to check the vin to check but I dont know how. http://houston.craigslist.org/pts/3606605113.html thanks for the help guys __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal

03-21-2013, 05:25 PM	#2
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: 4 bolt or 2 Bolt 500hp go for four bolt. Under that the two bolt is fine. Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

03-21-2013, 05:47 PM	#4
russgt Registered User Join Date: May 2008 Location: Waukesha, WI Posts: 904	Re: 4 bolt or 2 Bolt You can tell from the pictures that it is a 4 bolt main block. I would have no issues pushing a studded main 2 bolt into the 400 to 500hp range, but for anything over that you should be using an aftermarket block anyways. __________________ 70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634

03-21-2013, 05:52 PM	#5
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	Re: 4 bolt or 2 Bolt Okay, see I didn't know how to tell the difference between them, or how to tell the difference I looked up the vin on it and it showed that it could be a 2 or 4 bolt and I figured someone here could help me out better. Posted via Mobile Device __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal

03-21-2013, 06:16 PM	#6
tlawre87 Registered User Join Date: Jun 2012 Location: Meeker, ok Posts: 146	Re: 4 bolt or 2 Bolt Look at the main bearing caps. (The three center pieces) It has 4 bolts. A 2 bolt main will only have 2 bolts. __________________ Trevor 74 C20...work in progress. 04 Saturn Ion...Daily Driver

03-21-2013, 06:21 PM	#7
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	Re: 4 bolt or 2 Bolt Okay I see it, so what would I need to pull off on my motor to find out if my current motor is a 2 or 4 bolt? Posted via Mobile Device __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal

03-21-2013, 06:40 PM	#8
GM-power Registered User Join Date: Mar 2012 Location: Little Rock, Arkansas Posts: 770	Re: 4 bolt or 2 Bolt Oil pan Posted via Mobile Device __________________ 1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily"

03-21-2013, 06:45 PM	#9
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	Re: 4 bolt or 2 Bolt And I'll just look for those same like 3 bolts or what? Posted via Mobile Device __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal

03-21-2013, 06:49 PM	#10
GM-power Registered User Join Date: Mar 2012 Location: Little Rock, Arkansas Posts: 770	Re: 4 bolt or 2 Bolt Look for four bolts on top of the main bearing caps tlawre87 said. EDIT: I saw you other thread about pitting a cam in a 305. Is the motor you trying to figure out the the main bolt number a 305 or 350? Most 305 are two bolt. There are some rare 4 bolt 305s though according to some people. __________________ 1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily" Last edited by GM-power; 03-21-2013 at 06:56 PM.

03-21-2013, 06:51 PM	#11
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	Re: 4 bolt or 2 Bolt Alright thanks for all the replies guys!! I'm going to look into it pretty soon, can I do it with the motor still in the truck or do I need to have the motor out? Posted via Mobile Device __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal

03-21-2013, 07:02 PM	#12
GM-power Registered User Join Date: Mar 2012 Location: Little Rock, Arkansas Posts: 770	Re: 4 bolt or 2 Bolt It can be done without pulling the motor, but you may have to loft the motor up a bit and you might not have to. Not much help but thats just the way it goes sometimes haha. Posted via Mobile Device __________________ 1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily"

03-21-2013, 07:03 PM	#13
87r10owner Registered User Join Date: Sep 2010 Location: Okc,ok Posts: 89	Re: 4 bolt or 2 Bolt I have seen several 2 bolts pushed to 600hp and I'd take a splayed 2 bolt over a for bolt any day. I always thought that was a funny subject. But to the subject question yes it's a 4 bolt which for a street motor is irrelevant. But if you plan to do something with this where you get something extra is the fact that that block is a high nickel/high tin content. Just my .02 Posted via Mobile Device

03-21-2013, 07:03 PM	#14
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	Re: 4 bolt or 2 Bolt Haha I understand thanks for all the help and advice it's greatly greatly appreciated! Posted via Mobile Device __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal

03-21-2013, 07:14 PM	#16
87r10owner Registered User Join Date: Sep 2010 Location: Okc,ok Posts: 89	Re: 4 bolt or 2 Bolt Just a 2bolt, and if you are not building a 500+ high rpm race motor than a 2 bolt will do any show or boat pulling you plan to do. Posted via Mobile Device

03-21-2013, 07:18 PM	#17
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	Re: 4 bolt or 2 Bolt Yeah, I'm just going to try and build a really good bottom end and have good torque and just let the HP follow it. If I want splay it, where can I get that done? Posted via Mobile Device __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal



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03-21-2013, 09:30 PM	#18
87r10owner Registered User Join Date: Sep 2010 Location: Okc,ok Posts: 89	Re: 4 bolt or 2 Bolt Just google splayed main caps and which ever one you decide on just take them with the motor to who have do the machine work and they can install them or you can purchase from any machine shop. Posted via Mobile Device

03-21-2013, 09:44 PM	#19
77ChevySharkBite Registered User Join Date: Aug 2012 Location: Houston, Texas Posts: 2,475	Re: 4 bolt or 2 Bolt Alright awesome!! Thanks for all the answers I appreciate it a lot Posted via Mobile Device __________________ Korwin 77 C10 Silverado Sharkbite LWB Build 67 Chevy C10 Frame Off 06 Dodge Magnum 2.7v6 aka swag wag! 2010 Honda Accord 2.4I4 DD aka Liquid Metal

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