gas flowing the straight 6 head. - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 06-04-2014, 09:24 AM Thread Starter
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Question gas flowing the straight 6 head.

Hi chaps, does anybody know if its worth gas flowing and porting a 1965 220seb cylinder head?
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post #2 of 8 (permalink) Old 06-04-2014, 11:31 AM
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Only the person paying the bill can decide if it is "worth" it. What are you trying to accomplish - economy, torque, horsepower? M-B generally did a fairly good job with their equipment, but just about any head can do with some working if one is going for the edges of the envelope. If so, I humbly suggest that the 220 SEb is not an appropriate place to begin.
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post #3 of 8 (permalink) Old 06-04-2014, 02:15 PM Thread Starter
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Originally Posted by ejboyd5 View Post
Only the person paying the bill can decide if it is "worth" it. What are you trying to accomplish - economy, torque, horsepower? M-B generally did a fairly good job with their equipment, but just about any head can do with some working if one is going for the edges of the envelope. If so, I humbly suggest that the 220 SEb is not an appropriate place to begin.
Its not that its a place to begin but im restoring a coupe and the engine had seized due to being of the road for 40 years. the valves look terrible so im replacing them and having the valve guides changed so it can run on unleaded. i thought while im there i may get it gas flowed if theres any benefit.
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post #4 of 8 (permalink) Old 06-05-2014, 09:53 AM
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dont , you are thinning the ports , and then you may get a coolant leak .
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post #5 of 8 (permalink) Old 06-05-2014, 11:18 AM
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Help me out here - is "flowing" the same as polishing the surfaces? Or are you physically enlargening the ports?
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post #6 of 8 (permalink) Old 06-05-2014, 12:17 PM
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i dont think you would see much benefit in that. you would need to improve the exhaust and intake system to go with it and considering this isnt a seven main bearing engine you would overstress it. i would however match the intake and exhaust manifold ports to the ports on the head. it can improve the way the the engine responds by eliminating places for liquid fuel to accumulate making for a smoother running engine with less hesitation. You may find its pretty close already.
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post #7 of 8 (permalink) Old 06-07-2014, 03:48 PM
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polishing just do that , it removes almost nothing .porting on the other hand does thinning the walls[ risky ] .
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post #8 of 8 (permalink) Old 06-08-2014, 01:20 AM Thread Starter
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id only be interested in the polishing, not porting. do they match that to the inlet manifold and exhaust manifold?
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