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03-02-2014, 11:32 PM
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#1 |
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Registered User
 
Join Date: Nov 2013
Location: Winnipeg, Mb
Posts: 1,115
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Our truck big blocks......4 bolt mains??
Since they were truck motors and I do not want to take mine apart to inspect it....were the truck big blocks 4 bolt mains?
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03-02-2014, 11:36 PM
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#2 |
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Registered User
Join Date: Oct 2012
Location: Arlington Washington
Posts: 1,808
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Re: Our truck big blocks......4 bolt mains??
I'm gonna go with 2 bolt. I'm almost positive my 71 402 was a two bolt main
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03-02-2014, 11:38 PM
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#3 |
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Registered User
Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: Our truck big blocks......4 bolt mains??
my guess would be 2 bolt , they are 1/2 inch bolts
__________________
68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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03-03-2014, 11:56 AM
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#4 |
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Registered User
Join Date: Feb 2013
Location: Orange, Calif
Posts: 183
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Re: Our truck big blocks......4 bolt mains??
No if you're referring to light duty trucks 1/2 and 3/4 ton. Only high performance cars, those with the large square port heads got 4 bolt blocks. The heavy duty trucks with tall decks may have had 4 bolt mains but I think most of those were two bolt also.
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03-03-2014, 01:31 PM
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#5 | |
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Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: Our truck big blocks......4 bolt mains??
Quote:
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03-03-2014, 01:35 PM
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#6 |
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Florida Edition
 
Join Date: Oct 2010
Location: Fruitland Park, FL
Posts: 4,021
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Re: Our truck big blocks......4 bolt mains??
2 bolt...here is my original 70 402 for reference.
__________________
70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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03-03-2014, 03:31 PM
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#7 |
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Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Our truck big blocks......4 bolt mains??
As has been said countless times ... don't get yourself all bunched up over stock 4-bolt set ups. Unless the outer bolts are splayed, there is little to no advantage.
__________________
1969 c-10 Step Side Long Bed. I-6 250cid =  = 1969 Pontiac GTO hard top. 400, 4-speed.
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03-03-2014, 06:24 PM
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#8 |
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Registered User
Join Date: Dec 2012
Location: Providence, RI
Posts: 211
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Re: Our truck big blocks......4 bolt mains??
While on this topic, what about the crank shaft? I recently rebuilt a 1972 402 out of a C-20 (was told it was the original, but I don't think it was) and when I pulled the crank and dropped it off at the machine shop, the guy looked at me and asked what the crank came out of? It was forged steel, cross drilled and hardened? He said most cranks he cuts from that generation are cast
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Mark 71 C10 Cheyenne 12 Aprilia RSV4 |
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