cig1988

Being winterizing is in the near future I would send the risers & manifolds back to Gil to be pressure tested. Unless your able to psi test the manifolds yourself. I'd put my $$ on the exhaust.
Out of couriousity, what heads are you running ?

Payton

Look at the center devider in your Gil manifold. Take it off the boat. Make an adapter for a garden hose and put it on one of the hose barbs. Then cap the other one. That should give you enough presure o find your leak.

That is where mine was leaking and was able to be repaired.

gripit

Stan,
I have no idea what heads are on there. I think they are the ones that came standard with the 420 hp package. I know it has Dart intake and Crane roller rockers etc. I checked the risers and manifolds and couldn't find any leaks. Payton, I can't find a leak. I hooked up to a gardent hose on full blast.

The thing I don't understand is how could both gaskets left and right side have leakage from a crack in a head? Also both oil caps had milkshake oil in the caps. So what could cause these symptoms. The engines have 650 hrs.

cig1988

I would suspect the risers or a cracked head. I have 2 pairs off of the '88 & not sure if there any good. I would pressure test the block. I use a regular radiator tester w/an adaptor to a hose & engine full of water with some dish washing soap in it.

Biggus

iTrader: (1)

I've had bad luck with Gil cast manifolds. I'd be very suspect of your Gils.

gripit

I'm very suspect of the Gils. I'm going to send them back to Gil to be tested before tearing into the heads. What are the chances it would be a craked head or cracked valve seat? Then again, I'll be pissed if gil sold me 2 new defective manafolds.

RickR

GRIFF
If Gil risers are stil available please email me.
[email protected]
THANKS!

Dtile

I had simaler problem, thought the oil cooler was leaking but it was a bad head gasket (normal compression btw) and one a cracked gil. A piston finally detonated. Engine had only 2 hours on it. The water pressure in cly blew the gasket I would think.