Got a spare hour or two today so did a trial fit of the 6mm spacer I cut a couple of weeks ago.
Still waiting for 6mm and 8mm internal spacers to be machined from nylon , these are being done as a favour by a mate so I have to wait until he has time on his lathe, so I couldn't try it out with the engine running.
The plenum spacer fits perfectly as I would expect as all the location holes are from the laser scan of the original metal gasket.
I think I have added enough meat to the original gasket, blended out the profile around bolt holes and added meat where the plenum is wider than the gasket.
Its not a perfect copy of the plenum chamber outline varying here and there by a mm or so but its close enough to look good and it will function with no problems.
I fitted all the original bolts and tightened it up hand tight and it looks fine. Longer bolts will be used when fitted permanently.
Just got to wait for the centre spacers and I will fit it properly and take her for a run.
I am not sure whether to use gasket paper for the top of the spacer or to cut another thin steel gasket, the original metal gasket is 0.4mm thick which I can cut on the laser but we don,t carry in stock. The thinnest we go is 0.6mm, alternatively I could use a 0.4mm paper gasket, What do you reckon would be best all you mechanics out there.??
Don't suggest liquid gasket as its a pane to remove.
Well on the way to a plenum spacer solution.