I *think* had the airgap been around when Merc was doing all of their development it may have been a strong consideration for the 600hp and lower models, but at the time the options were a truck manifold or single plane.

F-2 Speedy is right. I was shocked at how small the Victor Jr ports are when I laid a gasket over them. They leave a lot of material in there so you can match whatever heads you have. The airgap isn’t as bad but I still took some time to hog it out.

F2
did removing all the meat help?

Smitty has done some dyno time with the Victor Jr. You can see his input on the last couple pages of my build thread if your interested.

https://www.offshoreonly.com/forums/...ml#post4645354

At the power your aiming for and your CI I'd tend to go single plane and port match. Dual plane do have awesome torque but think you'll sacrifice at top end. I only mention port matching because of your build. Honestly seen up to 50 hp gains on dyno back to back. Valako will verify. Some builds makes no difference or very minimal. Heck I've even ran Valako raised floor heads with a stock rec port intake and had no power loss. It was a weekend deal to get on the water but interesting. That was with a 454 build though with much less power. Look into the Merlin X intake. I'm not a big fan of them however seems like a lot of guys like them. NA 565 builds I'm using the brodix hv2001 unless I go back to sc. cross section and runner length is something to be considered also. Just my opinion..

Excellent points. I should also note that I do 90% of my boating under the 4K rpms and pull a lot of tubers and wakeboards. If I was going for the last few mph I’d do just as John said. I have an open bow so anything over 60 and I start losing towels, coolers, dogs, etc.

https://www.billmitchellproducts.com...00-marine.html


[img]blob:https://www.offshoreonly.com/38ceaf47-6128-4d15-9e66-e5d5cc103b4d[/img]

Was strongly considering this one, anyone use his stuff


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