Nope, they bolt right up no problem. Mine are ported to a 1250 intake gasket, and I dont remember what size exhaust. I forgot to get pics of them lined up against stock heads, but there is a big improvement in the exhaust ports. They till dont compare with most of the other aftermarket heads, but they are a decent improvement for cheap if you find a used pair.
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89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.
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