port and polish? m117 5.0 v8 1990 sec

[dannysec]

Hello everyone, The other day i heard a chuffing sound coming from the engine bay turns out cylinder number 8 has been helli-coiled and had failed and will no longer do up, so i will be getting the spark plug tread re done! i need to replace the valve seals anyway as it smokes now and then. so im taking my heads to a local engineers is it worth getting the heads ported and polished its quite a expense but from what i have read up about other v8's being p&p there have been sizable power gains i was thinking it would be rude not too while the heads are off? has anyone had there mercedes m116/m117 engines p&p or know anyone who has?

Many thanks

 

[hotrodder]

I don't know how this engine is regarded* but personally i wouldn't bother with a 'proper' port and polish** due to the time (and thus money) involved in doing it properly unless you're planning on tuning it. A quick clean up on the other hand is worthwhile but i'd all depends on how well finished they are as stock- probably pretty good i would have thought


* some engines are known for small/restrictive ports relative to the valve size while others have the reverse and the ports are already on the large side for the valves

** polish is a bit of misnomer in that actually polishing the ports doesn't work as well as smoothing/blending them and finishing with nothing finer than 60 or 80 grit. The bit that takes the time in doing a proper job is matchporting without wrecking the geometry/enlarging port volume too much

 

[NEOKEN]

has anyone had there mercedes m116/m117 engines p&p or know anyone who has?

Many thanks

Hi Danny, I am an independent custom port & polish specialist and I have ported and polished a set of M117 cylinder heads.
Port-matched to intake manifold as well as TB, I also have multiple M119 custom port and projects in the works as well.

I am also a BenzWorld R129 Moderator under the name (NEOKEN) since 2007.


Best Regards, Ken

 

[television]

Hi Danny, I am an independent custom port & polish specialist and I have ported and polished a set of M117 cylinder heads.
Port-matched to intake manifold as well as TB, I also have multiple M119 custom port and projects in the works as well.

I am also a BenzWorld R129 Moderator under the name (NEOKEN) since 2007.


Best Regards, Ken

I used to take part in the 129 threads back in 2005/6 and yes I recognize your name