Porting it to 115 Spec?

I came across this:

"If it is one of the old crossflow 90' V-4's, you could port it to 115 spec. and see a decent gain in performance. "

Can you elaborate on this please?  Does that mean I can turn my old crossflow 90 into a 115 or something close?

Thanks for all the excellent info!

- Sporky


Yes a 90 block can be ported to 115 spec. It is quite the project though. Not something for the backyard mechanic as the port layout has to be exact. One slip and your block is a nice flower planter.




Please submit whatever questions you have to IHRTechTalk@yahoo.com.  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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