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#1 |
Registered User
Join Date: Aug 2012
Location: Houston,Texas
Posts: 30
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Which engine for rebuild ?
My 70 truck had a year 68 inline 6 mounted that started smoking really bad 2 months ago and lifters knocking like crazy.
So pulled it out and installed a used (low-mileage but have my doubts) 250 engine from a 1978 Nova. Was told it only had 80.000 miles but not sure.... Anyway the "newer" engine has integrated intake & exhaust manifold and now it leaks anti-freeze around the rear section when I turn the truck off. A small stream can be seen on the left side of the engine block...so I guess it's time for a decision what to do next. My question is, which engine would be best for a complete rebuild, the 250 engine from 1968 with seperate manifold and intake or the "newer" 1968 250 engine ? I called around to a couple of different machine-shops and was told the integrated engine usually has cracked heads and not worthy trowing money at. So asking you guys for advice or comments what to do ? |
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#2 |
Registered User
Join Date: Aug 2012
Location: Houston,Texas
Posts: 30
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Re: Which engine for rebuild ?
Forgot to mention the "newer engine" has a couple of lifter noise, but no smoke and no water in the oil, runs strong but leaking from the rear head section...
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#3 |
Registered User
![]() Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Which engine for rebuild ?
How much is a rebuild ?
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1971 GMC Sierra 1959 GMC 100 |
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#4 |
Registered User
Join Date: Aug 2012
Location: Houston,Texas
Posts: 30
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Re: Which engine for rebuild ?
$ 1000 total
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#5 |
Registered User
![]() Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: Which engine for rebuild ?
Dang, I'm sure I could probably find it cheaper than that
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1971 GMC Sierra 1959 GMC 100 |
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#6 |
Registered User
Join Date: Aug 2012
Location: Houston,Texas
Posts: 30
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Re: Which engine for rebuild ?
Well, I called around Houston, they wanted between $1000 and $1.300 + tax for a complete rebuild with new pistons, bearings, lifters and all.
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#7 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,865
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Re: Which engine for rebuild ?
Use the separate head. You can use either block, but the integrated heads tend to crack and don't give you much for performance/improvement options. And as you are seeing, builidng a straight 6 isn't very cheap. That is why many folks go to the V8 as it turns out to be cheaper. I love the straight 6's though. Wish I had never gotten rid of the one in my 70.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#8 |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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Re: Which engine for rebuild ?
Id rebuild the 68 250 one of these days im gonna rebuild a 250 for my 67 those engines are wonderfull when in good condition ,
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1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC |
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Which engine for rebuild ?
i am a huge fan of the crate engine programs
rebuild writeups like this have been frequent over the years http://67-72chevytrucks.com/vboard/s...d.php?t=594903
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#10 |
Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: Which engine for rebuild ?
From what I have read on here, crate engines are the cheaper way to go unless one can do the work themselves. I have no experience in the area.
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#11 |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,496
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Re: Which engine for rebuild ?
I believe the blocks are the same, heads will swap. If so, do a compression and leak down test on he interfarted head engine. If it is good other than the leak pull the no int head off the 68 motor, get it rebuklt and install on the int head motor.
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