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#1 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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400 block worth saving or junk ?
I tore down the 400 block that was in my truck previously. It is a 2 bolt main casting # 3951509. The cylinder walls only have 3/16 of an inch between each other according to my tape measure. I dont have one of those mechanic gauges or whatever is used to measure all that. The motor smoked a little on the freeway before I pulled it. Is it worth rebuilding or is is not able to be bored anymore ? It all came apart pretty easy. Thanks for your help.
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72 C20 Longbed 05 1500 Z71 |
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#2 |
Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: 400 block worth saving or junk ?
they are siamesed bores, which means there is no water between them, because they are so big
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'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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#3 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: 400 block worth saving or junk ?
So does that mean it is still ok to bore or just put back together with new stuff. Youre talking to a tile guy not a mechanic so I ask about a million questions about this stuff.
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72 C20 Longbed 05 1500 Z71 |
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#4 |
Registered User
Join Date: May 2007
Location: Buffalo MN
Posts: 606
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Re: 400 block worth saving or junk ?
i dont know about boring it id have a machine shop determin that but you shouldnt having a problem puting new parts it in and drivin it again
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Trial and Error, its expensive but its a mistake i most likely wont make again 1971 chevy k10 custom deluxe http://67-72chevytrucks.com/vboard/s...d.php?t=341257 1968 chevy k/10 fleet http://67-72chevytrucks.com/vboard/s...d.php?t=334731 1948 desoto custom coupe fluid drive(family heirloom) |
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#5 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: 400 block worth saving or junk ?
You'll have to have someone check it with a dial bore gage. If it has never been bored before it should be alright. My book says it can be safely bored .030 over
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69 Chevy 4x4 383 Power ![]() |
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#6 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: 400 block worth saving or junk ?
dial bore gage, I knew there was a name to that tool. I will have someone check it before I decide to give it away or junk it. Thanks for all the help
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72 C20 Longbed 05 1500 Z71 |
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#7 |
Senior Member
Join Date: Feb 2006
Location: Lilburn Georgia
Posts: 1,240
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Re: 400 block worth saving or junk ?
don't junk it I've bored one .060 over before and a buddy of mine did one years ago .060 they were both racing motors my buddy poured his with hardblock to keep from giving any problems.sell it to a poor racer and he'll find a way to use it the cylinder walls don't have to be perfect like everybody thinks I know this from experience.
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#8 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: 400 block worth saving or junk ?
80 bucks of beer money sounds good to me Am I too cheap ? I have no use for it I was going to put in in my 67 project but I think I am going to sell the truck as I have no money and time to do anything to it
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72 C20 Longbed 05 1500 Z71 |
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#9 |
Registered User
Join Date: Apr 2004
Location: Las Vegas, NV
Posts: 2,188
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Re: 400 block worth saving or junk ?
Dont forget to have it magnaflux'ed as well. No use rebuilding a cracked block.
I agree with what others have said, though I am leary about a .060 400 SBC. There was a recent thread that turned into a pretty lengthy discussion about the danger of those siamese ports. The fact that it was smoking most likely means you will want to re-bore it, which gets increasingly dangerous the more you do. Good luck with it!
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RIP EastSideLowLife '72 C20 SWB convert. 5 lug, LS1/4l60e |
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#10 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: 400 block worth saving or junk ?
Guys pump those up to 427 cu.in. and would love to buy a spare block.For guys that use them,what you have is gold.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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