Thread: bbc head question

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g,day fella,s greetings from tasmania. i,ve got a rebuilt 454 short motor casting no 361959 to put in my boat it came with a pair of reco oval port heads casting no 10114156. i have been told this combination won,t work and as this is my first big block i,ve no idea why . can you blokes tell me why or are these clowns down here filling me up with shit. cheers big wad

you have a 70to 90 mark 4 block and 91 mark 5-6 heads the deck is not the same on the older blocks so old heads on a new block they will not seal very good in the intake valley and you could have a leaker but the deck on the new mark 5-6 heads are wider were they seal up by the valley so they could work on the older block i have done it with the right head gasket but you need to check it over put the head on the block with out head gasket out line with a marker pen in the valley side of the head take the head off look at the out line if there a good bit of sealing behind you mark you will be ok

thank,s for that mate . a bit of plain english is refreshing. cheers darin