The manifold above is known as the "Center Riser" manifold. It
replaced the MerCruiser "LOG" manifold for the 1983 model
year. The log style manifold has the riser at the back of the
The Moore Performance manifolds are an exact replacement for
the 1983 and newer 454 502 MerCruiser Big Block Chevy
manifolds. The external dimensions are identical with all holes
drilled and tapped like the original manifolds.
Cast Iron # 51240 $149.95
|Each manifold includes a stainless steel manifold-to-head
gasket, a stainless steel manifold-to-riser gasket, installation
studs or bolts, and a 1-inch hose water inlet fitting.
Questions? Call Dennis Moore @ 626-357-3573
|Mercruiser Exhaust Manifolds
Chevrolet V8 454/7.4L 502/8.2L
1983-newer Replaces Mercruiser Part Number