I should be possible to see numbers, oil pressures and oil levels, there should be some difference as drainage affects windage. Slower drain back might reduce windage. Also bits of paint falling off, chemicals leaching out of the paint into the oil and a smoother surface allowing less heat transfer are obvious negatives if they occur which they probably don't with special paints and experts doing it. The paint also seals impurities into the casting, stopping them getting into the oil and dissolving out. Think quartz particles from casting coming loose as pores expand and doing a nice job on the bearings. Some engine builders claim they have seen casting sand coming out of high mileage blocks during the hot tanking process.
It does look like Dave has removed casting flash from the valley, which I would imagine removes stress points.
V8's Built By Dave Gilliver
Re: V8's Built By Dave Gilliver
I assume that all of these engines have windage trays or crank scrapers, so that windage would be well controlled. Controlling windage by inhibiting drain back would be asking for oil starvation, IMHO.
Vance
I never miss an opportunity to stir the pot.
1980 Triumph TR8 - restored
1974 Jensen Healey - Assembly in progress.

1980 Triumph TR8 - restored
1974 Jensen Healey - Assembly in progress.
Re: V8's Built By Dave Gilliver
Looking back at these photos, that V8 with stamped rockers, all black and iron heads, brass core plugs. Heads painted inside. Looks fantastic. Can't really argue 

Re: V8's Built By Dave Gilliver
This one below John? >>> Looks Race & Powerful for some reason doesn't it

>> >>>
NICE ONE DAVEMAN

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Re: V8's Built By Dave Gilliver
Re: V8's Built By Dave Gilliver
Doesn't look like a petrol tank, looks more like a JATO bottle.
Wow!

Vance
I never miss an opportunity to stir the pot.
1980 Triumph TR8 - restored
1974 Jensen Healey - Assembly in progress.

1980 Triumph TR8 - restored
1974 Jensen Healey - Assembly in progress.
Re: V8's Built By Dave Gilliver
I think Dave was running a small jet/gas propelled set-up or something I remember him saying 

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