[tomaszek]

I am not sure if the person before me had it right. But my heads on this 350 had freeze plugs when I removed it on both heads in the front. Now that was test fitting the intake back on realized should these two Holes have been left open ? Thanks. I took a picture of the intake just so you can see which one it is.

[tomaszek]

Just realized the gasket that was one there is felpro 90205 and the gasket doesn’t go that far. So that’s why it was plugged. But I see there are other felpro that has the gasket go with a circle so the plugs could out ?

[thews]

Here's a linky talking about the size of the head plugs:

https://forums.maxperformanceinc.com...d.php?t=850624

[74SDformula]

Holes at the FRONT should be OPEN. Holes at the REAR should have hole PLUGGED on driver side and passenger side should have a NIPPLE for heater hose.

[tomaszek]

Ok thanks. I’ll have to pry the fronts out. The back is like you said. I have the nipple on one side and the other rear plugged. Hopefully the fronts removed might help keep it a touch cooler.

[tomaszek]

While on this topic. What is the middle square port for in the intake. It’s not one of the cylinder ports. I had the smaller felpro gasket in when I tore the motor down. The new gasket I have has these delete plates. Should I use the delete plate to seal it off ? Does it have to be sealed really good? Bc I don’t think that delete plate will seal it 100 percent. See picture. Thanks.

[indymanjoe]

exhaust crossover some people block it off. i filled mine with aluminum in the heads. Takes just a little longer to heat up the choke but its a nice way to stop an exhaust leak. supposed to be a performance upgrade. yrmv

[thews]

One thing I've learned about Pontiac 350's is to use stock 350 cylinder head gaskets. The 350/400 gaskets have a larger diameter hole for the 400 and I'm convinced it's why the 350 engine I had failed. You can find them on eBay.