Yet another 383 question...I know Im killin you guys...
#973296
04/14/11 10:09 PM
04/14/11 10:09 PM
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Joined: Apr 2008
Posts: 301 California
court9155
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Is this statement correct??
"The 68-69 383 4bbl. is the only 383 to have been built with positive deck height from the factory. The blueprinting manuals list it as +.020 to +.021"
?????
67 charger
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Re: Yet another 383 question...I know Im killin you guys...
[Re: court9155]
#973297
04/14/11 10:32 PM
04/14/11 10:32 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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blueprint spec, maybe, I don't know. do you mean piston out of the top of the deck?
actuality? never! these things were so far in the hole, had such a big bore for a relatively low stroke, the compression was so low you could probably run water in them--even the "hi-po" 383 4bbls rated at 335hp
**Photobucket sucks**
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Re: Yet another 383 question...I know Im killin you guys...
[Re: 70Cuda383]
#973298
04/14/11 10:34 PM
04/14/11 10:34 PM
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Joined: Apr 2008
Posts: 301 California
court9155
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Looking at that statement I found on the net, there is no way.
I think that they meant the piston is only in the hole .021 to .022 which would be better than most big block mopars from what I read.....
.021 above the deck would be impossible to put heads on it....
67 charger
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Re: Yet another 383 question...I know Im killin you guys...
[Re: court9155]
#973299
04/15/11 12:07 AM
04/15/11 12:07 AM
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Joined: Aug 2007
Posts: 902 Seattle, WA
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Quote:
021 above the deck would be impossible to put heads on it....
Not impossible with the open chamber heads used in 68 and 69.
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Re: Yet another 383 question...I know Im killin you guys...
[Re: court9155]
#973305
04/15/11 08:36 AM
04/15/11 08:36 AM
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Joined: Jan 2003
Posts: 75,083 U.S.S.A.
JohnRR
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Posts: 75,083
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Quote:
Is this statement correct??
"The 68-69 383 4bbl. is the only 383 to have been built with positive deck height from the factory. The blueprinting manuals list it as +.020 to +.021"
?????
NO , totally INCORRECT .
Quote:
IIRC, according to information posted in a similar recent thread, compression height for a '69 383HP piston was 1.932. This would put the piston 0.0025" in the hole assuming a deck height of 9.980" and rod of 6.358" and stroke of 3.375".
This is correct and the 68 383 4bbl and 4bbl HP is the same as in 69. just an FYI the 68-69 383 2bbl has the same CH piston but it has a shallow round dish to lower the compression towards it's rated 9.2.
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Quote:
021 above the deck would be impossible to put heads on it....
Not impossible with the open chamber heads used in 68 and 69.
Or a very thick head gasket. The .021 spec is the NHRA spec, many people CONFUSE this as actual built factory spec.
it appears that at least one member has actually paid attentions to my maniacal ![](/ubbthreads/images/graemlins/rant.gif)
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Re: Yet another 383 question...I know Im killin you guys...
[Re: MoparforLife]
#973308
04/15/11 12:00 PM
04/15/11 12:00 PM
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Joined: Jan 2003
Posts: 75,083 U.S.S.A.
JohnRR
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Quote:
FWIW I know a couple of guys that put closed chamber heads on a 68/9 383 and had piston clearance problems because of the o/+ deck height of the engine. It isn't all BS. Some were + some were very close to deck.
Only 3 ways this could have happen, someone decked the blocks, the factory screwed up and the deck was way too short which means they would have had to cut the intake or head to get it bolted together or they had something that was very special that no one knew about. I have 2 69 383HP engines in my garage with the heads off, both are factory deck and both still have their factory rotating assemblies, neither have pistons above the deck. Now I know that 2 hardly makes a sample, but I have had others in the past and everything was the same.
There was a guy that I used to work with, he's dead now, that ordered a 68 Road Runner NEW that he CLAIMED was some special 365HP package to run against the Chevelle SS with the 375HP 396. I never could find anything out about this and he was known as somewhat of a BSer so I just took it as that.
Until someone SHOWS me one of these MYTHICAL positive deck 383's or some factory documentation they are nothing more than unicorns ....
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Re: Yet another 383 question...I know Im killin you guys...
[Re: court9155]
#973310
04/15/11 12:12 PM
04/15/11 12:12 PM
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Joined: Jan 2003
Posts: 75,083 U.S.S.A.
JohnRR
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I'm told that early 340's have positive deck pistons , they use open chamber heads.
The 2 engines I have are about .002 - .003 BELOW the deck , one is in my 56k original mile 383 Dart GTS, the heads had NEVER been off it till I pulled them to freshen the heads. The other is an original 69 Superbee engine , I bought it as a backup , never ran it , it's got a .509 cam in it. My dart runs well for a 383 A body. I'm building a fresh 383 for it, the pistons are .002 in the hole, 80 CC 906's, true 10.2 compression on a .040 overbore. Eagle rods and Diamond pistons, hoping the car will run low 13's.
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Re: Yet another 383 question...I know Im killin you guys...
[Re: JohnRR]
#973311
04/15/11 12:21 PM
04/15/11 12:21 PM
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Joined: Apr 2008
Posts: 301 California
court9155
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Quote:
I'm told that early 340's have positive deck pistons , they use open chamber heads.
The 2 engines I have are about .002 - .003 BELOW the deck , one is in my 56k original mile 383 Dart GTS, the heads had NEVER been off it till I pulled them to freshen the heads. The other is an original 69 Superbee engine , I bought it as a backup , never ran it , it's got a .509 cam in it. My dart runs well for a 383 A body. I'm building a fresh 383 for it, the pistons are .002 in the hole, 80 CC 906's, true 10.2 compression on a .040 overbore. Eagle rods and Diamond pistons, hoping the car will run low 13's. I'm told hi 12's with the right cam and more gear .
Thanks for the input.
Is your Dart still using the factory exhaust manifolds?
Dan
67 charger
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Re: Yet another 383 question...I know Im killin you guys...
[Re: JohnRR]
#973314
04/15/11 12:29 PM
04/15/11 12:29 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
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Quote:
Quote:
FWIW I know a couple of guys that put closed chamber heads on a 68/9 383 and had piston clearance problems because of the o/+ deck height of the engine. It isn't all BS. Some were + some were very close to deck.
Only 3 ways this could have happen, someone decked the blocks, the factory screwed up and the deck was way too short which means they would have had to cut the intake or head to get it bolted together or they had something that was very special that no one knew about. I have 2 69 383HP engines in my garage with the heads off, both are factory deck and both still have their factory rotating assemblies, neither have pistons above the deck. Now I know that 2 hardly makes a sample, but I have had others in the past and everything was the same.
There was a guy that I used to work with, he's dead now, that ordered a 68 Road Runner NEW that he CLAIMED was some special 365HP package to run against the Chevelle SS with the 375HP 396. I never could find anything out about this and he was known as somewhat of a BSer so I just took it as that.
Until someone SHOWS me one of these MYTHICAL positive deck 383's or some factory documentation they are nothing more than unicorns ....
OK fine< >You guys seem to have all the answers whether you were there or not so according to you it and couldn't have happened. It happened and I WAS there. Don't remember seeing any of you around. PS: one was a 68 383 RR with less then 3000 miles - other 383 runner with about 6000 miles.
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