[asinger435]

i am rebuilding a 351c how do i find how many cc's my heads displace?

 

[nosaj122081]

what year heads.. 2V or 4V?

-Jason

'72 Mach 1 || '90 Talon TSi AWD
http://nosaj122081.tripod.com/parade3.jpg
"Thats not a leak, my car's marking its territory!"
"If you've done it, it ain't braggin'." -Roy Rogers

 

[whisperer]

Here's an old hillbilly country boy trick. Go to the local feed store and buy a 60 or 80 CC siringe for horses and cows, (cows on VMF, is that a first?.....*G*). Use something like a butter jug lid and cut the edge off of it so you have a flat clear piece of plastic. Put some grease around the edge of the chamber with it level and up, and push the plastic down on it but leave a small gap at the edge. Fill up the siringe with trans fluid or some other kind of light oil and check that it is exactly to the line, (80CC's etc.). Without spilling any start filling the chamber slowly and stop when it is full. Turn the siringe back upright and check the ammount that's left. Subtract that amount from what you started with and you have a very close measurement of what the chamber volume is.

OK, no, I don't build race engines this way. I use a $700 glass burette to match chambers with. But you know what, when I just want to check out a set of heads in a junk yard to see if they are 58's or 64's this does a pretty good job......... and I'm sure as hell not going to haul my burette out there.

Ok, let the cow jokes fly!...........*G*.




Hal
Love hard, drive fast, wear your seat belt.

PS, thats's my 'bird...... My Mustang is too ugly to take pictures of yet........*G*.

http://www.teleport.com/~cosa/bird2.jpg

 

[camachinist]

Most accurate way is to CC them yourself with a lab burette and a plexiglass surface plate.

You'll need two new valves which need to be lapped to seat leak-free in their valve seats, ideally after the valve job has been completed. You'll need a spark plug of the type the engine will ultimately use. You'll also need a means of holding the head upside down and reasonably level (within 1/2 degree or so). I prefer adding food coloring to water to make it easier to see but some prefer using a colored solvent as it will flow more easily into small spaces due to the molecular differences between the two.

BTW...I tend to look at the CC's in cylinder heads as volume and their relationship with the swept volume of the cylinder as part of the formula to arrive at the displacement of the engine.

Most people don't bother with this operation but I feel it is essential when building a racing engine, esspecially when combustion chamber re-working has taken place, either by doing a valve job (which can sink the valves, thereby increasing volume), by chamber re-shaping or by head deck surface milling.

Now, if you're looking for a guesstimate of your head CC's, here's one...
74.7-77.7 for the 2v heads amd 61.3-64.3 for the 4v heads...



Pat
http://www.jps.net/binay/webdocs/strtmstng002_sml.JPG

 

[camachinist]

Wow....I guess that college chem lab will be really mad at me someday...

700.00 huh? And to think it's gathering dust with its original stand and cleaning brush inserted.....in my mom's shed...

Go figure...*G*

Pat
http://www.jps.net/binay/webdocs/strtmstng002_sml.JPG

 

[whisperer]

hehehe........ I didn't say I payed $700 did I?.................... *G*.

Hal
Love hard, drive fast, wear your seat belt.

PS, thats's my 'bird...... My Mustang is too ugly to take pictures of yet........*G*.

http://www.teleport.com/~cosa/bird2.jpg

 

[asinger435]

hi
it is a 1970 with 4v heads
arnie

 

[nosaj122081]

Fomoco.com says for a '70 4V M-code engine that it is 61.3cc - 64.3cc... Good luck!

-Jason

'72 Mach 1 || '90 Talon TSi AWD
http://nosaj122081.tripod.com/parade3.jpg
"Thats not a leak, my car's marking its territory!"
"If you've done it, it ain't braggin'." -Roy Rogers