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has to be like for like.... if the s/c engine is a stock mk1, then it has a bigport head.... all bigport heads have the same intake and exhaust port pattern & bolt pattern.... you may need to use the shorter studs on the intake manifold, as the gze didn't use t-vis and used shorter studs than the n/a manifolds that did.
in any event.... if you are putting a HG in then take photos of the pistons... we can tell you what they are.
either way, there is more than just the piston's dome shape that differs in the gze motors.... the engine will NOT be as reliable as a gze if it has ANY n/a 4age pistons.
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