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Old 01-15-2013, 09:29 AM
TRBenj TRBenj is offline
MC Devotee
 
Join Date: Dec 2005
Boat: 1990 Ski Nautique
Location: NWCT
Posts: 1,129
Quote:
Originally Posted by boater8987 View Post
Very nice boat. When I called Indmar to determine if I had an HO 454 or standard 454 here is what they told me. " If the 454 has an aluminum intake manifold it is an HO454 around 400 hp if not it is a standard 454." Both manifolds are painted black. Should be able to check it with a magnet. Here is the parts maual. You can see different part # for pistons, cam, heads etc.

ftp://ftp2.indmar.us/Manuals/Older%2...s%20manual.pdf
If its got the original intake manifold, that is one way to check... but still not the best way. There will be a casting number on the intake that can be looked up online. If its an oval port intake, then its a non-HO. Ifs a rectangle port intake, then its most likely an HO... unless someone put a rectangle port intake on a oval-headed motor.
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