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Re: 1972 400 engine
[Re: Cab_Burge]
#3034860
04/18/22 09:46 PM
04/18/22 09:46 PM
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Joined: Sep 2017
Posts: 287 NW Illinois
MoonshineMattK
enthusiast
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enthusiast
Joined: Sep 2017
Posts: 287
NW Illinois
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I remember hearing one the Mopar drag race seminar engr. say that Mopar let all their cast iron blocks age and cure outside for at least 3 months after casting them before having them machined for use I don't remember him saying anything about aluminum castings I was told engine blocks and heads age 3 months outside. Otherwise the machined surfaces don't stay straight. Something about aging outside settles the casting. I was also told cast bodies for bridgeports or lathes age for years before being machined.
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Re: 1972 400 engine
[Re: MoonshineMattK]
#3034964
04/19/22 10:20 AM
04/19/22 10:20 AM
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Joined: Jan 2003
Posts: 74,974 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
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I remember hearing one the Mopar drag race seminar engr. say that Mopar let all their cast iron blocks age and cure outside for at least 3 months after casting them before having them machined for use I don't remember him saying anything about aluminum castings I was told engine blocks and heads age 3 months outside. Otherwise the machined surfaces don't stay straight. Something about aging outside settles the casting. I was also told cast bodies for bridgeports or lathes age for years before being machined. That may be the norm now but I can remember one 383 I had that was cast 3 weeks before the engine assembly date, I may still have it ?
running up my post count some more .
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Re: 1972 400 engine
[Re: JohnRR]
#3035001
04/19/22 11:56 AM
04/19/22 11:56 AM
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Joined: Aug 2003
Posts: 43,123 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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I remember hearing one the Mopar drag race seminar engr. say that Mopar let all their cast iron blocks age and cure outside for at least 3 months after casting them before having them machined for use I don't remember him saying anything about aluminum castings I was told engine blocks and heads age 3 months outside. Otherwise the machined surfaces don't stay straight. Something about aging outside settles the casting. I was also told cast bodies for bridgeports or lathes age for years before being machined. That may be the norm now but I can remember one 383 I had that was cast 3 weeks before the engine assembly date, I may still have it ? I would have every machine surface check for correctness before doing any thing repair wise to it I started building my own Mopar race and Hi Po street engine in the early 1970 after buying the micrometers, inside and outside and other precession tools to accurately measure so I could tell the machine shops what i needed done to blue print motors for NHRA "Stock" classes. Mopar quality control on machine work to their engines was not the best then and is probably not much better now
Last edited by Cab_Burge; 04/19/22 12:01 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 1972 400 engine
[Re: Cab_Burge]
#3035008
04/19/22 12:08 PM
04/19/22 12:08 PM
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Joined: Jan 2003
Posts: 74,974 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
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I remember hearing one the Mopar drag race seminar engr. say that Mopar let all their cast iron blocks age and cure outside for at least 3 months after casting them before having them machined for use I don't remember him saying anything about aluminum castings I was told engine blocks and heads age 3 months outside. Otherwise the machined surfaces don't stay straight. Something about aging outside settles the casting. I was also told cast bodies for bridgeports or lathes age for years before being machined. That may be the norm now but I can remember one 383 I had that was cast 3 weeks before the engine assembly date, I may still have it ? I would have every machine surface check for correctness before doing any thing repair wise to it I started building my own Mopar race and Hi Po street engine in the early 1970 after buying the micrometers, inside and outside and other precession tools to accurately measure so I could tell the machine shops what i needed done to blue print motors for NHRA "Stock" classes. Mopar quality control on machine work to their engines was not the best then and is probably not much better now I'm with you on that , I have a 2005 426 Hemi crate motor that was done by Cummins recon that needed the lifter bores bushed , block decked and the bellhousing flange cut so it was at a right angle to the crank center line ... and after all that the main line bores needed to be tweaked because they were tapered according to bearing clearance measurements on assembly ... nevermind the mess the heads were ... it was FACTORY FRESH WITH ONLY CAM BREAK IN TIME.
running up my post count some more .
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