BIGMC69

Whats up fellas, I am looking for some info. I have a 28 donzi with 350 mags, vortec heads. i tuliped some exhaust valves and need to replace them. I am looking for the valve sizes for both intake and exhaust. Gonna go with inconel exhaust valves and stainless intake valves. Thanks in advance.

regalman4925

i have that same motor in my shop torn down. i am not sure on valve sizes but i can tell you that it is a gmpp ram jet long block minus the efi setup. i ran all the numbers on it to confirm. great motor!

Mr Maine

Should just be stock 1.94 intakes and 1.5 exhaust

ondtip

I did the same thing with the 350 in my mastercraft. It is a 1995 with throttle body injection. A 1/2 inch piece of the gasket under the "carb" spacer broke away leaving a nice vaccum leak. Make sure you find out what caused that to happen or it just might happen again.

BIGMC69

well I do know tthat the injectors leaned out and caused the problem. The spark plugs on those cylinders melted down to nothing. I have since replaced the heads with new oem heads with stainless valves and replaced all injectors and its running great.

Trash

I had a 1995 350 Mag that the #1 injector leaned out (clogged/gunked up etc) and not only tuliped the valves but caused the exhaust valve seat to drop out of the head. Carnage ensued.

Had the injectors cleaned and flow tested and they came back to life but I used new/bigger injectors during the rebuild to accommodate the engine modifications.