Originally Posted by MILD THUNDER (Post 4602947)

What model Iron Eagles do you have? 345's?

One of the benefits of a large bore, besides more cubes, is it helps cylinder head airflow. If you have a head with a 2.30 valve and a chamber designed around a 4.250 bore, taking advantage of unshrouding the valve by pulling back the chamber some is a nice improvement in airflow.

Originally Posted by Rhythm and Blues (Post 4602943)

It really does sound like you’d end up at .300 @ 4.625, no?

Originally Posted by 14 apache (Post 4603119)

4.9 super block will have more in the middle not a standard spacing.
Standard bore spacing at 4.625 you will have .215 between cylinders.
They say .300 min that is on the major thrust on the cylinder wall not between the cylinders.

Originally Posted by Rhythm and Blues (Post 4603129)

Oh, I gotcha, thanks.

Originally Posted by 14 apache (Post 4603134)

No problem if you have any other questions let me know.. Btw if your brodix heads need welding send them back to brodix they do them cheaper than anyone.

Originally Posted by mike tkach (Post 4603171)

i only like to bore them enough to get a round hole,that way you have plenty of material for more over bores down the road.

Originally Posted by Rhythm and Blues (Post 4602943)

It really does sound like you’d end up at .300 @ 4.625, no?

Originally Posted by getrdunn (Post 4603540)

I read the same thing on two different sites for BBC dart big m blocks. GM blocks different.