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I can't remember how much thinner they were, but it could be measured using a ruler. From memory they are 10 bolt heads.
The original OEM thickness is as follows: (10 bolt)
Suffix B and on:
A=22.94 mm/ 0.903”
B= 62.55 mm/ 2.463”
Land Rover recommend amaximum of 0.5 mm / 0.020” should be removed, but from many enquires I havefound some that have had 0.070” / 1.778 mm removed without a problem
Don't know what the cc capacity is, but will vary if the heads have been resurfaced.
Just to be clear the 3.9 heads are identical to the 3.5 heads except for waisted inlet valves and the deck height. I had a 91 3.9 RRC and took 40 thou off the heads and fitted composite gaskets.
I fitted a set of 4.0 litre new heads that I bought and they were the same also. Except AFAIR the holes for the aircon bracket were smaller or larger.
All ( most) Rover engine parts are backward compatible.
I found the last of the heads were worse in the casting of the ports than the earlier heads with a BIG step in the exhaust port.
I have not found that the heads warp at all and I have never heard of a cracked V8 head. The worst that happens is that the exhaust valve can jam from carbon deposits and the inlet valves also get gummed up. I fitted the later seals to mine and did not seal the exhaust valve.
Regards Philip A
Thanks Old Farang and PhilipA :)