[GOSFAST]

This is one area of the build we allow the customer to make the call, after we've explained the "pro's & con's" of either/or.

We feel it doesn't matter all that much, both work! Bolt's, relatively speaking are usually less costly!

Thanks, Gary in N.Y.

P.S. Whichever fastener type you choose I would recommend NOT installing any anti-freeze until everything has had time to seal up. Even "minute" leaks seal up quicker with fresh water. Just be careful of outside temps??