intake bolts

NecroWolf

NecroWolf

lost marbles member
what size bolts should i drill and tap my vortec heads for? i seen some mention of fine thread would be good and was wondering what everyone is using
 
JSM

JSM

Active member
Re: intake bolts

NecroWolf said:
what size bolts should i drill and tap my vortec heads for? i seen some mention of fine thread would be good and was wondering what everyone is using
Click to expand...

3/8"-16 NC is what I use.

Fine thread is too easy to strip out, crossthread.

All GM intakes from 55-90's and beyond were 3/8 16 Probably a reason for it.
 
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