250 Carb-Bolt to Manifold stud size?

[texasrat67]

I know this seems simple, but I guess perhaps the bolts that I currently I have bolting down my carb, are not actually the original bolts. So I was wondering what type of bolt or stud bolts may have been in place originally to bolt down the carburetor to the manifold. I'm not sure of the size I currently have. I just know although they will work they are not original equipment. I suspect I need a small studs and nuts.


Anyone know what stud bolt and nut sizes might be if your bolting down an Autolite, Motorcraft, Holley 1940 1V Carb to a 1979-1980 250 engine that’s all original still?


Thanks
Terry

 

[bubba22349]

Generally stock they used studs on our small sixes with corse threads going into the heads intake bosses and fine threads on the top end were carb bolts down with a nut I use a lock washer and flat washer. The diameter for top is the same as thread dia. size inside manifold the length is determined by the type carb adapter plate used by year and throttle linkage used. Good luck

 

[texasrat67]

Thank you for the info.