Need some help! cracked blocked - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rollin thunder · 01-12-2013, 06:19 PM

I recently took down my 250 and discovered a crack

I was hoping to keep matching numbers but idk if trying to get this repaired and rebuild it or if it can is worth time and money, and risks in the future versus buying another or just getting a new long block from the part store and using this engine as parts for the tinwork. Thank you in advance for any input!

the crack runs all the way through to the inside into the coolant passage and through to the thread for the head bolt. The 2nd picture is where the water pump mounts, if more info is needed let me know i try to put as much I thought was needed

cableguy0 · 01-12-2013, 06:42 PM

That block should be in the scrap pile. Matching numbers or not. It is not useable.

68gmsee · 01-13-2013, 10:27 AM

Is there even a matching number on engines for these trucks?

Repairing the crack makes the subject moot anyway. Think about it, if you were in the market and you saw the block had been repaired, would you be concerned? I know I would.

As cableguy mentioned, it should be scrapped. Primarily because you don't know what caused that crack and there may be other weak or weakened areas in the block.

*bk2life* · 01-13-2013, 10:56 AM

it could be repaired. the loaction it is in inst 'critical' like next to acylinder.

you could have it welded up, and remaching it and never know it was there.

but what cause it. thats my concern. over heating?

shouldnt be too hard to find a nother 6'er..

rollin thunder · 01-13-2013, 01:47 PM

i`ll just get a new long block. thank you for the input, everyone on this site has saved my but several times. Still learning ins and outs of it all.

GRX · 01-13-2013, 04:54 PM

That block could be saved but you are better going with your long block. Best of luck!

Gumby · 01-13-2013, 06:51 PM

smack that corner area really hard, dead flat with a 5lb hammer, if you don't notice any change, its run/fix-able....

Coley · 01-14-2013, 01:59 AM

I get the idea of keeping the original engine with the truck so here is what I would do.
1) Keep the engine (block) and set it aside in storage for your own satisfaction, reference and bench racing 'chat'... or for others.
2) Get another block and build it up into a great runner and put that in the truck to keep yourself on the road. (personally I would add a touch more performance to the new/next 6 cylinder...with a bit of a cam and some headwork, but thats just me

)
You will always be able to assert that you have the original engine for the truck....just not currently installed in favor of a current better unit.
(note: nobody really gets too tied up into the numbers matching element with these trucks generally speaking due to the fact that GM did not stamp the blocks with the VIN until the early mid 70's...so 'true' numbers matching is always open to interpretation..sometimes)
My two bits.

Coley

Redcap · 01-14-2013, 02:08 AM

Junk.

GASoline71 · 01-14-2013, 03:44 AM

I've said it before... "Numbers Matching" only counts with Corvettes and Chevelles. The original engine in a truck will bring no resale value.

For one, finding a welder capable to weld cast iron correctly might not be very easy. The cost will probably outweigh the repair.

Find a new block, or go with the long block you said he local parts store can get you.

Gary

68gmsee · 01-14-2013, 09:42 AM

Quote:

Originally Posted by GASoline71

I've said it before... "Numbers Matching" only counts with Corvettes and Chevelles. The original engine in a truck will bring no resale value.

For one, finding a welder capable to weld cast iron correctly might not be very easy. The cost will probably outweigh the repair.

Find a new block, or go with the long block you said he local parts store can get you.

Gary

^ True.

I wasn't aware of Chevelles having matching numbers but I do know Corvettes had the last few numbers of the vin number stamped on the block - I have one on my engine stand.

**kwmech** · 01-14-2013, 04:27 PM

If it were mine, I would have no problem having that welded up and putting an insert for the head bolt

rollin thunder · 01-14-2013, 05:13 PM

Quote:

Originally Posted by Coley

I get the idea of keeping the original engine with the truck so here is what I would do.
1) Keep the engine (block) and set it aside in storage for your own satisfaction, reference and bench racing 'chat'... or for others.
2) Get another block and build it up into a great runner and put that in the truck to keep yourself on the road. (personally I would add a touch more performance to the new/next 6 cylinder...with a bit of a cam and some headwork, but thats just me

)
You will always be able to assert that you have the original engine for the truck....just not currently installed in favor of a current better unit.
(note: nobody really gets too tied up into the numbers matching element with these trucks generally speaking due to the fact that GM did not stamp the blocks with the VIN until the early mid 70's...so 'true' numbers matching is always open to interpretation..sometimes)
My two bits.

Coley

Dig the keeping it aside idea ha but i will for sure do another six seeing as 84(my truck) was the last year i believe they used the 250 and its not something people usually do around here. they drop big blocks in , ofcourse they are always mudding or pulling stuff or racing down some back-road.. which i will stick to pavement and rollin around on nice days

crazy longhorn · 01-14-2013, 06:27 PM

Good time to upgrade to a 292? It is my understanding, that the tall deck blocks didnt have that issue (read from Leo's book of inlines). Bigger is also better

...crazyL

01-12-2013, 06:19 PM	#1
rollin thunder Registered User Join Date: Jan 2011 Location: North little Rock, Arkansas Posts: 471	Need some help! cracked blocked I recently took down my 250 and discovered a crack I was hoping to keep matching numbers but idk if trying to get this repaired and rebuild it or if it can is worth time and money, and risks in the future versus buying another or just getting a new long block from the part store and using this engine as parts for the tinwork. Thank you in advance for any input! the crack runs all the way through to the inside into the coolant passage and through to the thread for the head bolt. The 2nd picture is where the water pump mounts, if more info is needed let me know i try to put as much I thought was needed Attached Images __________________ My build Lil` Red http://67-72chevytrucks.com/vboard/s...d.php?t=551373 1984 Chevy C10 short bed 2001 Chevy Impala police cruiser 2001 Chevy Silverado 1500 Z71 4wd extended cab dd

01-12-2013, 06:42 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: Need some help! cracked blocked That block should be in the scrap pile. Matching numbers or not. It is not useable. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

01-13-2013, 10:27 AM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Need some help! cracked blocked Is there even a matching number on engines for these trucks? Repairing the crack makes the subject moot anyway. Think about it, if you were in the market and you saw the block had been repaired, would you be concerned? I know I would. As cableguy mentioned, it should be scrapped. Primarily because you don't know what caused that crack and there may be other weak or weakened areas in the block. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

01-13-2013, 10:56 AM	#4
bk2life Account Suspended Join Date: Oct 2012 Location: phx, az Posts: 868	Re: Need some help! cracked blocked it could be repaired. the loaction it is in inst 'critical' like next to acylinder. you could have it welded up, and remaching it and never know it was there. but what cause it. thats my concern. over heating? shouldnt be too hard to find a nother 6'er..

01-13-2013, 01:47 PM	#5
rollin thunder Registered User Join Date: Jan 2011 Location: North little Rock, Arkansas Posts: 471	Re: Need some help! cracked blocked i`ll just get a new long block. thank you for the input, everyone on this site has saved my but several times. Still learning ins and outs of it all. __________________ My build Lil` Red http://67-72chevytrucks.com/vboard/s...d.php?t=551373 1984 Chevy C10 short bed 2001 Chevy Impala police cruiser 2001 Chevy Silverado 1500 Z71 4wd extended cab dd

01-13-2013, 04:54 PM	#6
GRX Registered User Join Date: Jul 2010 Location: MD Posts: 1,937	Re: Need some help! cracked blocked That block could be saved but you are better going with your long block. Best of luck! __________________ 1969 c-10 Step Side Long Bed. I-6 250cid = = 1969 Pontiac GTO hard top. 400, 4-speed.

01-13-2013, 06:51 PM	#7
Gumby Registered User Join Date: Dec 2008 Location: NW-Ohio Posts: 2,525	Re: Need some help! cracked blocked smack that corner area really hard, dead flat with a 5lb hammer, if you don't notice any change, its run/fix-able....

01-14-2013, 01:59 AM	#8
Coley Registered User Join Date: Oct 2011 Location: Victoria, B.C Posts: 3,794	Re: Need some help! cracked blocked I get the idea of keeping the original engine with the truck so here is what I would do. 1) Keep the engine (block) and set it aside in storage for your own satisfaction, reference and bench racing 'chat'... or for others. 2) Get another block and build it up into a great runner and put that in the truck to keep yourself on the road. (personally I would add a touch more performance to the new/next 6 cylinder...with a bit of a cam and some headwork, but thats just me) You will always be able to assert that you have the original engine for the truck....just not currently installed in favor of a current better unit. (note: nobody really gets too tied up into the numbers matching element with these trucks generally speaking due to the fact that GM did not stamp the blocks with the VIN until the early mid 70's...so 'true' numbers matching is always open to interpretation..sometimes) My two bits. Coley __________________ ....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500

01-14-2013, 02:08 AM	#9
Redcap Registered User Join Date: May 2010 Location: Lewis County, WA Posts: 1,523	Re: Need some help! cracked blocked Junk. __________________ '77 K35 - 454, SM465/NP205, 4.56 D60/14bFF

01-14-2013, 04:27 PM	#12
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,634	Re: Need some help! cracked blocked If it were mine, I would have no problem having that welded up and putting an insert for the head bolt

01-14-2013, 06:27 PM	#14
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Need some help! cracked blocked Good time to upgrade to a 292? It is my understanding, that the tall deck blocks didnt have that issue (read from Leo's book of inlines). Bigger is also better...crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....



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