Has anyone used the Fel-Pro 1255 gaskets? What is the best way to seal these? It shows using a quick dry adhesive, but how much do you use and where are the best places to use it? Thanks for any help you can be!
you can use an adheasive sealant like permatex blue. just a lite smear around the water ports and intake ports (mainly to hold in place while the manifold is brought into place . no sealer necessay on the manifold side (side of gasket with the raised seal)
These gaskets are flat. They don't have a raised seal that I see. Also, the intake has extra water holes in the back on each side of the distributor. I heard you can hook these together to help with cooling. Is that true or should I just plug them?
It there is not a raised portion around the port openings I would use sealer on both sides around the ports on both sides. if you manifold has threaded openings at the rear, (usually 3/8npt, these can be connected by fittings/hose to the corresponding openings (usually 1/2npt, at the front of the manifold) . This will improve cooling/circulation. It won't do much good just to connect them together.
These gaskets are flat. They don't have a raised seal that I see. Also, the intake has extra water holes in the back on each side of the distributor. I heard you can hook these together to help with cooling. Is that true or should I just plug them?
Ah ok, the front connects to the back to help with cooling. That makes sense actually. There is a port in top also in one of the runners. Is that for an oxygen sensor or something else? This new intake has alot more holes than I am used to.
F'BIRD'88, your:
"I found if you connect the drivers side rear water port to the bypass port on the water pump it helps the cooling system a lot. Much more stable and consistent."
Sounds interesting. Is that the port that normally provides water flow to the heater? Some racing water pumps have an pressurized outlet on each water pump horn to get more cooler water to the rear of the heads, I think that's where it goes.
BBP
Yeah, that was my thought. Right now, the port on my water pump goes to my heater core. How much would it help cooling to use the back ports on the intake? If not a big deal, then I'll just plug them.
Isn't #7 running hotter than #8 a result of a design problem with stock water pumps not flowing as much through the horn into the drivers side of the block? I have read that it is better with a long pump vs. a short & completely addressed by the Stewart Stage 2 pumps.
F bird 88 this part of your last post is some what misinformed.
The water ports on each side of the carb flange are for hot water to aid cold weather engine warm up. The hot water helps heat up the manifold plenum under the carb faster to get off the choke sooner in the winter.
Don't need this for the summer.
Those are exhaust crossovers, they work with the heat riser in a stock manifold outlet, when cold the heatriser closes so the hot air not water crosses under the carb to help in cold weather driveability. Look the next time you have a set of heads apart into the exhaust port with a light and you will see what I am talking about.
"Instead of hooking the other heater hose to the port near the thermostat as on other manifolds, hook it up to the drivers rear water port."
You already used the drivers side port, I think you mean the passenger side?
Sooo, coolant coming out of the rear of the passenger side head would would flow via a hose to the front of the intake manifold & through the thermostat & to the radiator?
This flow would be bypassing the trip forward through the passenger head? I have read about this being helpful, at Stewart pumps website for one, but I really don't understand it?
I bet with a couple of diverter valves you could run the heater in the winter & cool the rear of the motor in the summer?
I think he means there is more than one way to do it. Instead of routing the hose coming out of the heater core to the front of the motor, route it to the back drivers side port right?
Thanks, I'll try that. I may use the front drivers side port for my engine temp sensor, instead of in the cylinder head. I also read more on the intake gaskets. It says not to use any around the intake ports but around the water ports is a good idea and to use the tacky adhesive to hold the gasket from moving any. Everywhere I read, it recommends these gaskets for the vortec setup. They are really thick!
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