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Well it seems you need a new seat and a new valve.
I was planning on all new valves, springs and guides at a minimum, but was hoping they could re-cut the valve seats if there is enough material left. I am assuming this can be done on a 964?
I'm still adding up the cost in special tools etc needed to drop the engine, strip it down and then re-assemble after heads come back from the machine shop. I don't have an engine stand or yoke. Of course I have to also estimate the "while you are in there" costs and this could include some of your chain case covers Konrad. It all adds up quickly. Does anyone have any recommendations for an experienced machine shop that knows the 964 engine? Preferably in Canada.
Well my experience is that if you cut seats and grind valves you end up out of specs for how much the valve stem can protrude out of cylinder head. New springs and retainers is always good move.
Please check the current prices for the valves, and be sure to sit while doing so.
In my case I decided to go with aftermarket ones with 8mm stem (like 993) and bigger size, like in 993 RS.
I used TRW valves on my Sh!Tbox engine. The engine is a stock 3.6 and pumps out an astonishing 275hp and 260 ft pounds of tq. Pretty good for an essentially stock engine. The engine has had some hard track days and so far no issues. Normally i would go with the factory sodium filled valves but IIRC I saved quite a bit and they are holding up to grueling track punishment. I would reach out to Don at EBS. He has always been very helpful and fair priced. Although I don't know if he is doing sales there anymore, I believe he now runs the business but I would give them a shot. Also consider the Ti spring retainers and seats along with Assco springs. Sorry the news wasn't better. Cool borescope. I used them for decades but technology has changed so much and I could have used the big screen and high res when I was inspecting the aircraft parts I made. We had mirrors back in the day the articulating head makes me want to go out and replace my old Bosch unit.
L&N Engineering says they will do all 6 heads with new valves, valve guides and valve springs for $1,900 USD. I wonder what brand valves they use.
I am loving the new scope. I also used it to inspect the spring retainers and springs. I also took a peek at the oil pump inside the crankcase.
That resolution is amazing. You can read the TRW markings on the valves.
For extra $$ you can get even higher resolution. If anyone is looking at these to purchase, I would strongly advise getting one with the dual lens like mine. And if no budget constraints, get the one with 4-way articulation. I opted for 2-way articulation figuring that with two lenses plus 2-way articulation, I would be able to see what I need to see and indeed it is working pretty well so far.
Switching from one lens to the other is just one button press on the handheld controller. The probe cable is 5 feet long which is a bit cumbersome for engine inspection but the extra length would come in handy for home use. If anyone is interested, mine is the Teslong TD450S Dual Lens. (no affiliation)
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