I have a 455 olds. Installed single carb tunnel ram intake with 850 cfm demon carb. Fired boat up, runs good but is making small whistle noise as if there was an intake leak. Did a vacuum leak test, no leak. Not sure if this is normal.. does anyone have any input?

My street car makes a weird wistle when i climb into the secondaries..always has.. i just ignore it!!! Lol

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What boosters do you have in your carburetors?

Do you have a spark arrestor or scoop?  Does it whistle with it on or off?

At all throttle positions?  Is there a mismatch between the base plate and the plenum at the mounting surface i.e. can you look through the the carb and see no part of the manifold/spacer/etc. protruding into the throttle bores?  Did it always do this or did it just start?  If it just started, did you make any recent changes?

Some guys turn the scoop around to face backwards so the engine doesn't get swamped.  Some because intake noise can be just as loud as the exhaust.

Look into dogleg boosters.

Are they easily changed in that carb?

At all throttle positions?  Is there a mismatch between the base plate and the plenum at the mounting surface i.e. can you look through the the carb and see no part of the manifold/spacer/etc. protruding into the throttle bores?  Did it always do this or did it just start?  If it just started, did you make any recent changes?

Some guys turn the scoop around to face backwards so the engine doesn't get swamped.  Some because intake noise can be just as loud as the exhaust.

i was running a torquer intake before and i put the tunnel ram on im not running a spacer but i am running the throttle cable plate to hold my cable