My '67 Fleetside C10 renew

[jlsanborn]

Originally Posted by jlsanborn

Got some of these today... Wrong truck tho.

No steam holes, don't look like any water jacket to drill into. Brodix says I don't need them. Any experience Here? Google search is all over the place. It's obvious to me that there'd likely be a steam pocket between the siamesed cylinders but how much drama could that create? Some people say no problem while others say they had trouble. Ugh!