I just got done cc'ing my first head. Here are my Numbers.

1 60ML
2 62ML
3 65ML
4 64ML
5 63ML
6 64ML

Head casting # 2483169

Can someone help me convert ml to cc's the only thing I had to accuartly maccuratelyter was a 60 ml syringe?

Do these numbers sound about right?

How much can I mill off of this? Thanks

One of the nice things about the SI Metric system is that 1ml = 1cc. Your numbers fit well within the normal range of SL6 combustion chambers. How much can you mill off this head? A fair amount, 090" or .100", but don't just mill the head as a "shot in the dark", take the time to plan out the whole build. You may also want to consider milling the block instead of (or in addition to) the head to get the results you're after.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

Ido pretty much have a plan for the entire build.But I was trying to break it down a bit I allready have the cam intake headers etc. Tomarrow or the next day I hope to measure how much the piston is down in the hole. I'm kinda up in the air about shaving the block as it's a fresh rebuild on the bottom end. It's bored .06 over and has never been started. If I tear it back down to shave the block will the bearings andeverything still torque down properly or will they be over torqued and give me a bogus reading.

Back to the head am I right in saying 53 cc is the number I'm shooting for and milling .0066 will remove 1 cc ?

Could I mill extra off the head and not tear the engine back down I will post alittle more on this tomarrow I gotta get going to work. Thanks

This is a nice number Doc has provided us and it works pretty well on the "big chamber" heads like yours...when shooting for a compression ratio calc. make sure you take into account the head gasket (some guys have forgotten and suddenly they wonder why things aren't jake anymore...ie. make sure to account for the .02 for the shim gasket or .040 for the Felpro/composite gasket when milling...).

Good luck,

-D.Idiot

I would check the cc's again after the machine work just to be sure it came out right. Also you might need to match them up again. If you are doing work to the block anyway, I like the idea of milling the block as well. You could have the head cut enough to clean it up or get it about half way to what you want, check the chamber cc's and then calculate the exact amount to take off the block. Just milling the head it will be a little harder to hit an exact ratio the first time. The bore being round makes for solid math verses a close estimate. I have a theory that keeping the valves farther away from the deck of the block may help the flow a little as well, but this is not tested. As far as making the chamber quench area or squish band work, it will have too much clearance to matter either way on a pump gas engine. Of course if the block is not getting work then just milling the head is the obvious choice.

So lets say I'm gonna say 63 cc's are what my head measure's to reach 53 cc's I needto remove .066 +.04 for the felpro gasket making a grand total of .106 to be removed. Is this correct? I hope to get my depth mic's and indicator out tomarrow and measure how far my pistons are in the hole Then I will make a post and lay everthing out. Right now I'm getting called into work all the time so I sure hope to get back to it soon.

You need to base it on the largest chamber (after cleanup), then match the other chambers to the largest, then mill the head..............

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Based on your PM, piston deck is currently -.200
As noted above, head volume is 64cc
This is not unusual for a SL6 but you will have to mill-off a lot of material to get the compression up, especially if you plan to use an aggresssive cam profile.
DD