if i cut a set of 186's down as far as i can, what are the cc's

I think about 48cc if you angle mill.

Don't know, but I wouldn't cut them flat past the edge of the intake seat!!

It's a cc for every 5 or 6/1000's isn't it guy's, flat planing them??

But you can angle mill them to up the amount of combustion chamber volume reduction, but I don't have the numbers??

Think it is like as extreme as .100" to .125"???

FWIW, you can buy 50 cc chambered, 200 cc intake port Pro- SB heads from Powerhouse, (enginekits.com), for not all that much money IF you want ta feed her when your compression goes through the roof...

ANd I did save this so have a good read. it's from Mike over on Big Brother's site, (Team Chevelle)..

"Angle milling is done by cutting the head across the chamber or head gasket sealing surface zero at the intake side & all off the exhaust side to a certain amount.
1 degree on a small block is a little over .130" taken off the exhaust or chamber side of the surface.
The reason for angle milling is you are limited by the intake seat as to how much you can flat mill the head.
Then the intake surface has to be cut back to 10 degrees which is the stock angle from the chamber side to the intake side on a 23 degree head so the intake manifold will still be at the correct angle to seal.
The tops of the bolt holes need to be spotfaced so they are flat to the new chamber surface & on large cuts like the one above you will need to ream the bolt holes out so the bolts will line up with the holes in the block.
You also need to either cut the bottom of the intake or top of the block as the intake will now be lower.
The reason the headers can become a problem is because you have "tilted" the head slightly which brings the headers in towards the engine. Sounds like a lot of fun huh The main reason is to make the chamber smaller for compression.
It has nothing to do with quench as this is the flat part of the head & piston & it is still flat, this doesn't change. Have I confused you enough yet Mike (Wolfplace)"

pdq67

PS., better mention the possible problems here too like having to cut the intake manifold as well as any intake port sealing problems, plus pushrod length changes sorta deal too AND the valves possibly "kissing" the pistons and their valve notches not quite lining up too...

a good read indeed!
E

Why render those 186's usless.
If you get them cut down that far or angle milled the intake will need to be shaved so the contact faces are at the same angle and everything will weal.I know in my area there are very few shops that can get this right.
Most are mom and pop machine shops without a clue of performance/race applications.Or they are machine shops who "THINK" they can do performance machining graemlins/sad.gif

Once you remove them it is most probable that anyone who tries to use them will not get them to seal.
Thus rendering them useless and they will probably be thrown away graemlins/angry.gif

This happens more than one would think :(

Look into new heads that have small combustion chambers and more flow to start with!
No intake shaving, more power than 186's, and they will seal smile.gif

Or simply get a performance piston to start with ;)

Most of the time I hear this question because someone has dished pistons graemlins/sad.gif

Thanks for the replies guys, this was a question from my brother and law. He's building a 350 for circle track and was wondering what size of heads they were. graemlins/thumbsup.gif