These Barr Marine (made in the USA ) exhaust manifolds and risers, were purchased brand new a year ago for a 1989 OMC Cobra Ford 351 small block engine that ended up never making it out on the water because of low compression found on a few cylinders and so was replaced with another engine. The manifolds and risers have less than an hour run time on them with just being hooked up to a garden hose, before being uninstalled this spring and stored till now. These are listed on Barrs website as being a center rise universal fit for Small block Ford 302 and 351 marine engines. The part # for the manifolds is FM-1-83, and the 3" Barr riser part# is 20-0082, and also included if needed are the 90 degree exhaust adaptor elbows with hose Barr part# 20-0093P that were already on the old engine so not purchased new by me. If you purchased these all separately, you would be spending upwards of $1200-$1400 dollars plus tax and shipping, so $500 firm is a very fair price for what are still new manifolds and risers. These also include the manifold to cylinder head mounting bolts, but you will need new gaskets before bolting them on your engine. If you have the older log style OMC manifolds and risers, these will actually take the place of them since the Ford OMC log style are no longer being manufactured. Please call or text is best.