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1995-2002 Range Rover P38A
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Hi, would anyone happen to know what's the story with these pistons? Block, crank, rods are stock 4.6, just the pistons look different than standard.

Pistons ?
DSC_0343_1.jpg

Block #60D
DSC_0340_1.jpg

Standard piston
standard_piston.jpg
 

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They are 'pocketted' pistons with cut outs to allow for a high lift cam to be fitted. Does the engine have a standard or sports camshaft?
 

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1995-2002 Range Rover P38A
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Cam is still in the block. Any way I can tell without taking it out (any stamped numbers to look for etc)?
 

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1995-2002 Range Rover P38A
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The pistons in the engine are for 3 or 4 valve heads, the piston on the bottom is a stock one.

May be high comp pistons?

See if the dish on the pistons in your block are smaller as on the stock one.
 

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As far as I know, nobody has ever made 3 or 4 valve heads for the Land Rover V8. As said, they are pocketted pistons to allow bigger valve and/or a high lift camshaft to be fitted. See the spec on this engine http://www.v8developments.co.uk/products/engines/short_engines/4.6_performance_short_engine/index.shtml
Then the piston would have a pocket in the center.
These pistons could come from a completely different engine.

I've got 4 liter HC pistons in my 4.6, should have a CR from about 10.9 : 1, and there is plenty of room for the valves, no need for pockets in those pistons
 
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