How much boost is too much?

[tegillen]

I have a 84 T-Type. Stock long block, How much boost until I blow a head gasket?

 

[bison]

what octane? what tuning devices?

 

[gn4u2c]

This kind of question says you have no idea what you have and are just cranking boost. bad idea !! do a full tune up, new 255 or red pump hotwire kit, fill up 93, Get a 3 inch downpipe and hi flow cat or test pipe from gbodyparts, hi flow air filter, good boost gauge,knock gauge or scanmaster and see where the car stands at that point before you turn the boost up at all. Those items will give you more power and more "room" to tune.
Once its in good order at that point get a chip from Turbotweek and start cranking it up every car is diffrent you could pop a gasket at 10 psi on a stock hot car thats out of tune. Or get it right and run 13-14 psi all day

 

[tegillen]

boost, how much

I have all the things in your list, but not sure about the cat. She will make 14 psi and have not adjusted the waist gate. The nut is loose and it needs to be set. I purchased the car this way. It just needed a put new fuel pump in it. Thanks

 

[WarWagon]

I have a 84 T-Type. Stock long block, How much boost until I blow a head gasket?

I could guess now, or you can hurry and blow the head gasket and let us know what boost level did it.
Most likely you could run all the boost you want but the Detonation will kill the HG or piston/rings first. So still hard to say what boost level will do that.