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Mismatched engines

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skubadave

New member
"Hi all,

For one of the few

"Hi all,

For one of the few times in my life, I am trying to head off a problem before I create it!

In a two engine inboard, I will be replacing one engine. The remaining engine is a 350 older style (1986-95) so is rated at 260-270 hp.It only has about 300 hrs on it, so is not a prime candidate for replacement. If I put in a new 350 vortec rated at 300 hp will I be shooting myself in the wallet and elsewhere. My understanding is that the newer engines' best performance is at a higher rpm than the older ones. Will synching be a nightmare. Option of replacing both engines has been vetoed by 'the Commanderess". Would I be better off replacing with a simialrly rated engine? thanks much for your thoughts.
Dave"
 
"Update: i just learned that t

"Update: i just learned that the engine that will remain was built with a roller cam, but NOT vortec heads.
Dave"
 
"Why don't you buy a reman

"Why don't you buy a remanufactured longblock? You can get this in an exact replacement and by using your old bolt-on parts, the performance will remain the same. Just be sure to confirm the rotation and replace the manifolds and risers with new."
 
"Dave; if your inclined to rep

"Dave; if your inclined to replace the other engine with the vortec in the next ten years, then you can operate with the mismatch. Leave the prop pitch the same on both sides and you will limit the system to the weaker side rpm. On the other hand, it's going to be a "quilt" and will look weird to a buyer.."
 
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