Re: New Heads On A Used Engine
[Re: BeEtLeJuIcE !]
#1056157
08/18/11 03:09 PM
08/18/11 03:09 PM
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Joined: Dec 2009
Posts: 1,074 detroit, mi
POS Dakota
super stock
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super stock
Joined: Dec 2009
Posts: 1,074
detroit, mi
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Quote:
old wife ? ... and no-tail ? ... ...
Don't they both go hand in hand?
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Re: New Heads On A Used Engine
[Re: mikemee1331]
#1056158
08/18/11 05:07 PM
08/18/11 05:07 PM
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Joined: Jul 2008
Posts: 205 Martinsville, VA
440child
OP
enthusiast
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OP
enthusiast
Joined: Jul 2008
Posts: 205
Martinsville, VA
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Quote:
i swear my old wife never said that, and trust me, the 'tail' is long gone!
Maybe I should have used the word 'myth' instead.
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Re: New Heads On A Used Engine
[Re: POS Dakota]
#1056159
08/18/11 05:11 PM
08/18/11 05:11 PM
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Joined: Jul 2008
Posts: 30,431 Florida STAYcation
BeEtLeJuIcE !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
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Quote:
Quote:
old wife ? ... and no-tail ? ... ...
Don't they both go hand in hand?
hand-in-hand ? ... ..
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Re: New Heads On A Used Engine
[Re: 440child]
#1056160
08/18/11 05:15 PM
08/18/11 05:15 PM
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Joined: Apr 2010
Posts: 4,154 bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Quote:
i swear my old wife never said that, and trust me, the 'tail' is long gone!
Maybe I should have used the word 'myth' instead.
around here it is always wise to choose your words (and spell them right) or the flames get flyin' and the wise cracks get crackin'! all in all we're pretty harmless and in desperate need of lives!
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Re: New Heads On A Used Engine
[Re: PASTLITE]
#1056163
08/18/11 10:29 PM
08/18/11 10:29 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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Hot new heads make you want to beat on an engine If the short block was marginal, you'll hasten its demise by beating on it (old heads or new). If the short block was solid, it should live just fine. My 75k mile OE short block is living fine at this point with a fresh set of ported Magnum heads, but I'm only around 3000 miles on the combo... you'll have to check back with me!
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: New Heads On A Used Engine
[Re: 440child]
#1056164
08/18/11 11:03 PM
08/18/11 11:03 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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Quote:
What's up, all. I've always heard that putting new heads on a used engine would cause it to mess up sooner or later. Is this an old wives tale or no? TIA for any help.
its a chebby thing
but it comes from the idea...if you shave to raise comp ratio,do a valve job so seals up the cyl good.
the used and worn rings will have more blow-by from the pressure in the cyl.
comes from chebby guys explaneing why they have blow-by on their re-ring amd dingleberry hone job
my 360 head 318 cop engine is a 88 and never had the heads off yet,I added a roller cam in 07' , its been by me for over 10 yrs now
I know why i cant tune the miss out,and know why it blows 2 qrts oil a week,and know why its low on power...it worn out!
I think I could prove the myth if i just did a valve job and left the rings as is at this point...it well over 300,000 miles
run what ya brung
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Re: New Heads On A Used Engine
[Re: scratchnfotraction]
#1056165
08/18/11 11:12 PM
08/18/11 11:12 PM
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Joined: Jan 2003
Posts: 8,027 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,027
Tulsa OK
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I used to think it was BS until I saw it happen.
My dad had a 1980 Crew Cab dually with a 360. This was 2003-2004 or so and it only had 70K miles on it, it had a fair sized cam in it and doug thorley headers. It had been used alot as a tow vehicle and it picked up a miss and it turned out to be a bad exhaust valve. Well I tore it down and he had the heads redone. I put it all back together and fired it up. I warmed it up and shut it down, I had some things to take care of on it so I retightened some things and tried to fire it back up. It cranked like it had no compression and would barelly try to fire. Kind of stumped I called it a day. Well my dad messes with it and figures out it will start if you put oil in the cylinders and it will kind of run...run like it doesn't have any compression. Soooooo it can happen even if you think it is BS lol.
68 Barracuda Formula S 340
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Re: New Heads On A Used Engine
[Re: DaytonaTurbo]
#1056170
08/20/11 01:27 PM
08/20/11 01:27 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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There is a bit of truth to the story. If the engine is wore out enough to need new heads then the rest of it is probably on it's way out too.
If you ONLY fix the heads why would it surprise anyone the rest of the worn out engine gives up the ghost not too much later?
Common sense.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: New Heads On A Used Engine
[Re: Supercuda]
#1056171
08/20/11 04:21 PM
08/20/11 04:21 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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My understanding is that if there were no defects in manufacturing, the engine parts usually wear at the same rate. A high mile engine that uses oil and smokes does so because ALL parts are worn. Bolt on fresh heads that seal better and the stressed piston rings are under a greater load and the oil burning actually can increase. I had a 360,000 mile 305 in a Chevy truck that still ran great and passed CALIFORNIA smog, but 2 exhaust manifold bolts broke off flush to the head causing an annoying leak. I had a pair of 350 heads freshly rebuilt for another project, so I swapped them over since I needed to keep this daily driver operational and smog compliant. The motor actually LOST power with the new heads and the motor spun 3 rod bearings 10,000 miles later. I should have just rebuilt the whole motor instead of replacing the heads, but I only had a weekend to make the changes. Still, 370,000 miles from ANY gas engine is impressive.
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