572 vs 598

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01-04-2018 | 09:11 PM

#21

Rhythm and Blues

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From: Maine

Quote:

Originally Posted by MILD THUNDER

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.

We havent bought the heads yet. I assume 345s yes.
Theres still a very small chance my heads will be decent; gotta wait till disassembly..

Last edited by Rhythm and Blues; 01-04-2018 at 09:29 PM.

01-05-2018 | 01:10 PM

#22

14 apache

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From: Northport N.Y.

Quote:

Originally Posted by Rhythm and Blues

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

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.

01-05-2018 | 01:30 PM

#23

Rhythm and Blues

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From: Maine

Quote:

Originally Posted by 14 apache

Oh, I gotcha, thanks.

01-05-2018 | 01:45 PM

#24

14 apache

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From: Northport N.Y.

Quote:

Originally Posted by Rhythm and Blues

Oh, I gotcha, thanks.

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.

01-05-2018 | 01:57 PM

#25

Rhythm and Blues

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From: Maine

Quote:

Originally Posted by 14 apache

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.

Yeah will do, thanks! I’m sure I’ll have more questions. Yeah, one head was already sent back to Brodix once when the previous owner dropped a valve; I dont have the documentation but from what I was led to believe it was spray welded and cleaned up in 1 chamber area..

01-05-2018 | 05:39 PM

#26

mike tkach

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From: yorkville,il

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.

01-05-2018 | 07:58 PM

#27

Rhythm and Blues

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From: Maine

Quote:

Originally Posted by mike tkach

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.

That sounds like a good motto; so do you aim for a finish bore whatever it may be that you can utilize non custom pistons or do you matter of factly just take enough off to get it round then see what you've got?

01-05-2018 | 09:46 PM

#28

mike tkach

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From: yorkville,il

that depends on the build but usually bore to the next size shelf piston,if building something custom that requires a specked piston i have gone as little as .005 over.