I have here for sale a pair of marine 454's bored .030 so now 460CI, Merlin oval port heads, ported very nice and matched to dart intakes, forged pistons, crower rockers, flat tappet cams not sure what they are I didn't get that info, these will be complete as seen with carbs, one is off as it's in middle of being rebuilt so I don't have it it pics, one on engine needs redone to run better, I bought boat for parts and ran engines they had 65+ psi oil pressure, PM me for many more pics and videos of them running, I took pictures of cylinders with a scope and compression tested them, results are on valve covers, sold AS IS, no warranty of any sort I did more info and pics then most will give you I see no issues with them, Like I said, I have videos of them running in the boat you have to message me for them. I didn't build them, heads are stamped with "redline auto" maybe in New York, I didn't find them yet to try for info, They will come with all the accessories and everything as seen with the ignition and such. 10,800.00 for pair picked up Olmsted falls Ohio, these would be great. If you buy a boat that needs engines. You can clean these up and paint them and throw them in and go boating.! I would assume these to easily be 500/525 hp.