alright...ive gotta bad ticking from my engine when i accelerate. so...i can tell its an exhaust leak..especially when i can smell the fumes in my car with the windows up and the fact that there are manifold gaskets on my car, not header gaskets. (dont worry i didnt do that..) i have edelbrock headers....but....what i need 2 know is what is our port size? i saw mr gasket gaskets that were sm bk chevy 2??-4?? and the port size was 1.44 by 1.55. something like that. the others were1.30 by 1.36. u guys know what a port size is on a 305 tbi? stock heads

 

You ones that say SBC round.

 

aw man theyre round?? i thought our ports were square