MerCruiser 98503 98504A3 V6 V8 4.3L 5.7L 305 350 3" Pair Exhaust Manifold Risers NOS 0L 181cid with a 1

0L 181cid with a 1 piece rear oil seal

700 / 70hp 3cyl (1977-1979)

Cast #: 58204 (if your cast # is the same it doesn't always mean it is the same flywheel)

so roughly 1/4"

so i did take a wire brush to it

MerCruiser 98503 98504A3 V6 V8 4.3L 5.7L 305 350 3" Pair Exhaust Manifold Risers NOS 0L 181cid with a 1Item Details MerCruiser 98504A3 Exhaust Mainfold Elbow Riser Assembly You get the PAIR as pictured Stamped 98503 Original Paint No cracks or welds overall good condition Price is for the pair as pictured of these 3" risers. Used on various MerCruiser V6 & V8 applications from 1981 1987, but generally the early years. Please make sure the parts you are swapping with are stamped 98503 or 95755 These have 3" exhaust tube outlets rather than the newer 4"