XU10J4RS head on XU7JP4 block

[welshpug]

You will need a XU10 cam belt, XU10 head gasket and i think XU7 hexu7 the manifolds and cams  bolts.
I would imagine you would get a fair power increase if you also added the gti inlet and exhaust manifolds but this would all have to be on aftermarket management as neither the XU7 or 10 ecu will adapt for this.

following this will give a big fat fail I'm afraid Niall!

cam belts are the same, you must use the xu5/7/9 hg, as the bore is 83mm not 86mm.

using the rs manifols is a no brainer,,apart from the tiny ports on the xu7 the manifolds hold it back, and the cams.

inlet valves are actually smaller on the rs head, but far larger port, xu7 valve springs wont really take the rs cam.

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they can indeed make good power, seen results from one such engine on the 205 forum a few years back, one of sandy browns race engines made around 240 bhp, the only bit standard was the block liners and crank, head was a modified xu7, custom pistons rods and manifolds, cams to sandy spec.

the 206 wrc used this block as base for its 2.0 turbo engine with 85mm liners and 88mm stroke crank