on a small block?

I know on big blocks you can just get the valley pan with the port blocked off but they dont have them on small blocks.

Can I just cut a thin sheet of aluminum thats thinner than the intake gasket and stick it in the gasket opening?

I wouldn't trust aluminum with all that heat. Stainless might be a better choice

In the past I have used a piece of tin from from a can. Would have prefered something better, but that's what I had, it worked.

The first time I took my intake off, someone before me had pumped a ton of silicone into the holes on the heads. It did work.

I took a small ball(3/4") of aluminum foil wrapped tight. Tapped it in the heat cross over slowly until it conformed to the shape. Then used the RTV red to seal it in place.I used it together with the felpro gasket with the block off. Its been in 2 years with no problem. Sounds a little Mickey Mouse ,but it works!

Fel-Pro makes an intake gasket that DOES NOT have the holes cut in it for the heat riser. I used there gaskit on a 360 in a drag car and didn't have any issues with it for the two years that I raced it.

The best block off would be to take
a large lead fishing weight and drive it into the
cross over port then surface or work down to
the intake surface. Dan Dvorak told me this
several years ago and it works.

logan426

My brother buys a zinc alloy of some sort from Mondello and melts it and pours it into the opening on his oldsmobile heads. It's expensive to buy, but pretty easy to do.

He tried doing it by melting some old pistons down, but it didn't work very well. You need a tremendous amount of heat to liquify aluminum and keep it in that state long enough to pour it into the holes. It ended up all lumpy and parts would crumble off if you picked at it so he dug it back out and started over.

If your intake is aluminum why not weld them?

whats the temperature at the opening tothe exhaust port? Lead melts at 600 degrees. It would suck if the lead melted

I used those felpro gaskets and they burned through in about 3 or 4 years even of limited use. I have regular hp exhausts on my AAR.

Grab some .020 or thinner steel and be done with it.

thin metal works best,I rvt it to the head,then install the gasket and intake

if its 2 thick it will/could cause an intake leak or suck oil into the port..DAMHIK

another way

I use the permotex copper and fill the heat cross over in the heads,about 2" deep,then smooth off at intake surface,let cure over night

never seen that stuff move or burn yet

been sealing old header gaskets for awhile with it also

it does not get any hotter than right there at the bowl behind the valve and the top side of the exhast port into the header flange

if it dont burn there after 2yrs,its not gonna burn

if that is not to shadetree for ya

that crap plugs up the flow of a radiator pretty good also

I used those fel pro 1213 gaskets & some aluminum foil wadded up balls.they're not(havent yet) going to melt. those are nice gaskets.

One easy way is just use a manifold that doesn't have a crossover, like an air gap or an M1 single plane.