Recently build a 4.6 out of a 4.0. Used studs which was a lot easier than bolts and safer on the block.
Used standard head gaskets (Elring?) but sealant only around the water passages (but I cannot see why not to give the entire gasket a squirt as well) - evidence on the 4.0 block showed the gaskets had held up well but there were coolant leaks around the coolant passages so hence the sealant there - same with the tin valley gasket when it is time to put the inlet manifold on.
Engine has not covered a lot of kms but seems to be holding up well.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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