BBM block dimensions

[preaction]

Should there be any clearance between the first main cap  and the sides of the register in which its installed and tightened down not torqued down and without a crank or bearings ?

[blykins]

No, it's an interference fit.  It will be tight against the registers and will be tight on the dowels.   You will need a slide hammer to pull the caps before and during mock-up.

[preaction]

Thanks Brent my first and last main caps can fit a .020 feeler on both sides. I will post  some pics.

[blykins]

I should have read better.

1st and 5th caps will have clearance.  The middle 3 will be pretty stinkin tight.

I have one on the stand right now and my 1st and 5th caps have .020" clearance between cap and block too.

[preaction]

The first two are the front cap last two are the back cap. What are my options?

[preaction]

Good as that's what I have too, I thought all were close fit.

[preaction]

Does anyone know of a reason for the clearance on these caps (1&5) and not a tight fit for the front and back  ?

[blykins]

Doesn't need to be.

The middle 3 take the brunt of the stress and they are cross-bolted, so they have to be very tight against the registers for when you torque the cross bolts.

First and fifth caps are doweled and studded, they are not going anywhere.