RAOC Bun Fights

The DeLorean has the same rocker arms as the early Z7U's.I had one set of ally rockers from a late GTA engine spare and wanted to use those on this build. Turns out they're fractionally taller than the older cast iron ones, and the DeLorean's rocker covers have ridges cast on the underside... ridges which have dents in them on the late GTA covers.

The difference is so minute that you don't notice it when putting the covers on, but it's enough to hold the valves open by a fraction of a millimetre.

And you expected us to guess that one No chance, but interesting though. You wont do that again in a hurry

I'm not sure but the same problem might be encountered with older Z7U covers on late rockers.

I'm not sure but the same problem might be encountered with older Z7U covers on late rockers.

Martin, Make up a Rocker cover gasket shaped spacer, two gaskets, and Bobs your uncle

You haven't heard my opinions on rocker cover gaskets then?

Dave's the expert on keyways and accurately setting up high lift cams

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Yes, I like the idea of them, so does Renault...

You haven't heard my opinions on rocker cover gaskets then?

Go on then

... my guess is he doesn't like them.... which may be why the rockers hit the cover.

Martin don't like solid gaskets .
Probably not a good idea to use this stuff then ............
http://www.renaultalpineownersclub.com/ ... 0609#30609

Yep Martin doesn't like the timing cover gasket or fibre rocker cover gaskets as they're a bigger for leaking. Since switching to silicone only (as used by Renault on the late engines), I've never had a problem.

The problem is the ally rockers, not the lack of gasket. This is not the first time I've built a turbo engine using DeLorean covers, nor is there a problem using silicone on a stock DeLorean engine with iron rockers

Renault never put reground cams in an odd-fire, and neither has Dave.

Hmmm, why would Renault 'regrind' a cam, when they manufacture from scratch and fit the keyway in the correct position . They are not going to remove the keyway and just rely on the torque of the bolt in the end to hold the pulley in position like you do..