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Old 02-05-2018, 06:09 PM   #1
79powerwagon
 
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Surface finish

Can't find much with search...

Looking for a surface finish spec for 12v head.

Took my head to a race shop which typically does 20-30 ra

Too fine?

*i should add, using stock Cummins HG
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1979 Dodge Warlock W150 Ppump 12v/518

Last edited by 79powerwagon; 02-05-2018 at 06:10 PM.
 
Old 02-05-2018, 06:53 PM   #2
BC847
 
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1.5 ~ 3.2 micrometers (60 ~ 128 microinches).

As per 1993 Factory Service Manual D&W 150-350, Ramcharger, Rear Wheel Drive Truck. Page 9-115.

- Conversion chart:
http://www.mactechonsite.com/wp-cont...sion-Chart.pdf
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Original owner of a VE fueled 1993 W250 ClubCab.


Silencer ring MIA, str8 pipe with 10" exhaust tip, 250psi boost gauge, ghost-lights 'n truck-nutz. K&N air filter next (if my grades are good enoufh).

Last edited by BC847; 02-05-2018 at 07:00 PM.
 
Old 02-05-2018, 07:04 PM   #3
79powerwagon
 
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Thank you!

What end of the spectrum is recommended for a performance application?
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1979 Dodge Warlock W150 Ppump 12v/518
 
Old 02-05-2018, 07:06 PM   #4
jasonc

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Are you gonna oring?
 
Old 02-05-2018, 07:13 PM   #5
79powerwagon
 
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No, just oem gasket and new headbolts
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1979 Dodge Warlock W150 Ppump 12v/518
 
Old 02-05-2018, 07:19 PM   #6
79powerwagon
 
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Only a VE pump after all....

Not going too crazy. Not having issues, mainly preventative with 300k+ miles.
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1979 Dodge Warlock W150 Ppump 12v/518
 
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