Blocking cylinder head exhaust crossover

[Mark Yacavone]

I don't recommend doing it like the video shows on a Stocker..God knows, you wouldn't want to make grinding marks in the port area ..You'd have to hide them.

I've done maybe a 100 sets for engine builders around here.
I make little metal tabs that are the shape of the passage opening down in the port. I leave a little tail on the tab that I bend and prop up against a 5/16 bolt in the guide. Alternatively, you can used cotton balls, soaked with P of P . stuffed down in the port.
I fill from the level port side. If you pour too much, just knock it down with a grinder, and mill the rest when you skim the intake side.
I don't pre-heat anything. .If there's a leak ,it'll fill up with carbon before long.. It's not that critical.
As long as you don't blend the plug into the bowl, it's legal. Leaving it back a tad doesn't hurt anything.
I just use old pistons or aluminum scrap
I haven't tried the zinc, but i might. It might take less heating gas. The price of oxy/acety keeps going up like crazy

[SSDiv6]

Originally Posted by Mark Yacavone

I don't recommend doing it like the video shows on a Stocker..God knows, you wouldn't want to make grinding marks in the port area ..You'd have to hide them.

I've done maybe a 100 sets for engine builders around here.
I make little metal tabs that are the shape of the passage opening down in the port. I leave a little tail on the tab that I bend and prop up against a 5/16 bolt in the guide. Alternatively, you can used cotton balls, soaked with P of P . stuffed down in the port.
I fill from the level port side. If you pour too much, just knock it down with a grinder, and mill the rest when you skim the intake side.
I don't pre-heat anything. .If there's a leak ,it'll fill up with carbon before long.. It's not that critical.
As long as you don't blend the plug into the bowl, it's legal. Leaving it back a tad doesn't hurt anything.
I just use old pistons or aluminum scrap
I haven't tried the zinc, but i might. It might take less heating gas. The price of oxy/acety keeps going up like crazy

Mark,

The video was just an example and I should have put a note clarifying the issue for a Stock Eliminator engine. You can still do it the way shown for a Super Stock cylinder head.
I do not do it this way either, I stuff aluminum foil down the exhaust crossover passage and pour the molten aluminum down the intake face of the cylinder head.

[SSDiv6]

Originally Posted by Mark Yacavone

I haven't tried the zinc, but i might. It might take less heating gas. The price of oxy/acety keeps going up like crazy

Mark,

Zinc melts at a lower temperature than aluminum at around 787°F versus 1220°F for aluminum.

[Dave Gantz]

OP should've stated if this is for a class legal engine.

[Doug Domm]

Sorry I should have mentioned that yes indeed a stock eliminator engine. My current heads have some kinda greyish whiteish looking in there but I can’t determine what it is. It almost looks epoxy like.

[SSDiv6]

Originally Posted by Dave Gantz

OP should've stated if this is for a class legal engine.

You can still fill the heat crossover in Stock Eliminator within the parameters of the rule book.

[Dave Gantz]

Originally Posted by SSDiv6

You can still fill the heat crossover in Stock Eliminator within the parameters of the rule book.

For sure. I was just agreeing with Mark in that grinding marks wouldn't be a good thing.