head specification as new

S

Shakey Bender

Active member
I tried a search but came up no luck. I need to know what stock as new heads came out at. Also where do you measure. The head is from a 65 200. Its in the shop now and the machinist is waiting on me to do my homework. If I have not been clear what i'm looking for is how do you measure to determine if a head has been milled previously. I'm shooting for 9.01 compression with a felpro gasket. Would be guessing but based on my ffsph hopup guide I want to take off .060.
Thanks Clint
 
.60 is a lot. I think it would put your cr. over 10.1.
Heres a pm I got from one of our Profesionals (Dave- AZcoupe I beleve)for my 200cu build. but I was using a 260 head. It looks like 2cc per .10 milled.
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I just ran some numbers on the CR calculator. Assuming a deck height of .025", a standard bore of 3.68", and a Felpro Composite gasket at .055" compressed thickness and a chamber cc of 58, you will have a CR of 7.9:1.

Milling .040" and assuming a reduction of chamber volume to 50 cc and all else the same the CR comes out to 8.7:1.

Milling to .050", assuming a reduction of chamber volume to 48 CC and a NAPA head gasket at .045" compressed thickness, all else the same the CR comes out to 9:1.

Be sure to measure after milling to verify the new chamber volume. the ratio of .010" cut equaling a 2 cc reduction is only an estimate.

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tim
 
The '65 head had 51 to 53 cc's as we measured them. It has a small log with 1b0but 1100cc volume. The intake valve diameter is 1.64" and the Exhaust dia. is 1.38".

A lot can be told about whether or not the head is "stock" by a machinist. The stock steel shim gasket is a good indicator of "stock" He should be able to tell if the valves have been done before or if the valve guides have bee knurled - both indicating it's been apart previously - but not necessarily milled. Even if it's been cleaned up with a mill of .010 another .060 isn't going to hurt your goal.

Go to the web site in my signature and click on the compression calulator in the left margin or use the link jahearne gave you. The calculator is preset to a "Stock" 200. Increase the gasket thickness and the compression goes down. Then decrease the combustion chamber cc and the compression goes up.

IMHO, while you have the head apart for the milling, backcut the intake valves. Goto the "Hardcore tech" section of this forum and read "What is a 3 angle valve job." It includes backcutting.http://fordsix.com/forum/viewtopic.php?t=2962

Good Luck
 
Thanks for the tips and info. I haven't invested the time to measure my cc across the head. To lazy. I was hoping the machinist would be able to pull up measurements of the head on his database. No one has the measurement of a unmilled head at the bolt flange or other reasonably stable area of measurement?
 
Before I get flamed. Keep in mind that this is my first project rebuild. I am aware that the only one to suffer if don't get my act together and take the steps to do a complete job of measurements will be my engine performance. But its daunting. The intake and exhaust tracts have been blended and polished by me. Took about 14hrs. Man what a dirty job. I had hardened seats installed to replaced the induction hardened factory seats with multi angle grind. New stock steel valves with backcut are going in with 302 springs. Guides have been machined to accept positive stem seals. The exhaust gasket surface is getting touched up and a couple of the bolt holes are getting studs to make up for some thin casting on the flanges. Goals for the engine are reliability streetability and a lot of character. I'm going with FSPP lopey cam and a duraspark 2 stock manifold for now into 2 inch single out turbo muffler. Intake will be matched to a single barrel carb running at 315cfm. Transmission is three on the column manual. Thanks for the good luck wishes I will need it no doubt about it. Clint
 
For what it's worth, I think you're doing a fine, well-planned job.

Tomorrow is Saturday, and my machinist doesn't work on Saturday.

I'll try to remember to ask him on Monday if the is a measurment specification for the untouched head casting. It would be a good thing for all of us to know.

I did a cc of each combustion chamber after doing the chamber polishing and milling. High to low was a 1.5 cc variation. I evened them out with more ( very dirty job) shaping. I also then knew exactly what cc number to plug into the Compression Calculator.

FYI putting in the new seats tends to raise the valve in the cylinder using up cc's too.

With a lopey cam, you want to have additional compression, because the valves close later thus reducing actual mathematical compression.

Excellent planning
 
Howdy Clint:

You got my curiousity up on a one barrel carb that flows 315 CFM????? Am I reading that right????

The biggest one barrel carbs that I know of are the Autolite 1101 at 210, The Carter RBS at 215, and the Carter YF from the 300 engines at 195 cfm.

I'm hoping you have a secret you can share. Thanks in advance.

Adios, David
 
Sorry had a brain lapse. All I have is a 1101 out of a 223. 1.29 rated at 210cfm. I have so many things going on with the car that I was just reaching for a # in my post. :oops:
 
I'm into mine for 200$. Don't worry about me sniping it. But if you do get it please share measurements. I don't think I'm the only one who needs to know.
 
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