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Author Topic: Dimension of M129 Valve and Valve Stem  (Read 1316 times)

Jack the Knife

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Dimension of M129 Valve and Valve Stem
« on: March 10, 2023, 23:25:40 »
Does anyone have these measurements handy for a port/polish job I'm outsourcing?
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1964 230SL
2015 G550

DaveB

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Re: Dimension of M129 Valve and Valve Stem
« Reply #1 on: March 11, 2023, 01:57:32 »
valve specifications
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DaveB
'65 US 230sl 4-speed, DB190

Jack the Knife

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Re: Dimension of M129 Valve and Valve Stem
« Reply #2 on: March 11, 2023, 02:35:55 »
Perfect! Thank you, Dave! The 250SE specs will work, as the M129 head is from a 250SE/M129 anyway.
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1964 230SL
2015 G550

Benz Dr.

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  • Canada, ON, Port Lambton
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  • Benz Dr.
Re: Dimension of M129 Valve and Valve Stem
« Reply #3 on: March 12, 2023, 04:30:21 »
Make sure they don't touch the throat below the valve seat too much. I find port matching to be of benefit.
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1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC
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