Reply To: 1955 QD 16 Rod Knock/Piston Upgrade Question

[Steve D]

I think this might be the bleed hole fleetwin is referring to. This is from one of his posts 7 years ago.

https://www.aomci.org/forums/topic/1956-johnson-10ho-qd-19-exhaust-housing-temp/page/5/

“I DID find a horizontal cooling water bleed off that is directed into the exhaust hsg, I’m thinking the hole is between 1/32-1/16″ in diameter. Like I say, the hole is horizontal, although I’m thinking it is probably angled down just a bit to help cool the exhaust hsg. The exhaust chamber is open into the forward area as well, so I’m guessing this bleed helps keep the forward area cool as well. It should be noted that I found this same bleed hole on an FD powerhead as well…”

(edit: pictures got rotated? Gonna try and fix that.)