Clayed my engine, then CC'd my heads
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From: Watertown, NY
Clayed my engine, then CC'd my heads So I did the clay test on my engine today to check my PTV. Set is forged 347, diamond -2cc pistons, 232/236 112LSA 112ICL, tea stage 3 heads with 2.055/1.57 valves.
I put the clay in, torque the heads down, turn the engine over twice by hand, pull the head, and then sliced the clay up to check thickness of all areas with my dial caliper. Keep in mind that accecptable PTV is .80 intake/.100 exhaust. The thinnest part of my clay was where the exhaust valve almost meets the valve relief, and let me tell you it was tight. It was like .130 or very close to it, and that was with my old used stock gasket @.050 and I will be running a .040 gasket on my final setup. So i am wondering why its so damn tight when the heads are advertised at 63cc on teas's site. I bought them slightly used so who knows. I was dissapointed because I figured i cant mill much off the heads now to get my DCR up.
So then i get home and decide to CC the head myself so I pop the spark plug in on one chamber and get out my milliliter syringe and start to fill it up. I filled it up to 57 CC and it was almost overflowing, @ 57CC and it had the big surface dome on the top too so i took 1CC out and it looked filled but without the huge surface dome. heads must have been milled when they were ported/polished. So I am estimating 56-57CC on the chambers.
So now I am pleased with the setup because I dont have to send the heads out for milling and i still get some really good DCR without having to mill or advance the cam. Should be 8.65-8.75. Not too bad.
Figured id share the experience with you guys. If you buy used stuff i highly recommend doing this before milling and before assembling the engine. I feel much better about it now that i know the actual sizes of everything and how much clearance I have.
I put the clay in, torque the heads down, turn the engine over twice by hand, pull the head, and then sliced the clay up to check thickness of all areas with my dial caliper. Keep in mind that accecptable PTV is .80 intake/.100 exhaust. The thinnest part of my clay was where the exhaust valve almost meets the valve relief, and let me tell you it was tight. It was like .130 or very close to it, and that was with my old used stock gasket @.050 and I will be running a .040 gasket on my final setup. So i am wondering why its so damn tight when the heads are advertised at 63cc on teas's site. I bought them slightly used so who knows. I was dissapointed because I figured i cant mill much off the heads now to get my DCR up.
So then i get home and decide to CC the head myself so I pop the spark plug in on one chamber and get out my milliliter syringe and start to fill it up. I filled it up to 57 CC and it was almost overflowing, @ 57CC and it had the big surface dome on the top too so i took 1CC out and it looked filled but without the huge surface dome. heads must have been milled when they were ported/polished. So I am estimating 56-57CC on the chambers.
So now I am pleased with the setup because I dont have to send the heads out for milling and i still get some really good DCR without having to mill or advance the cam. Should be 8.65-8.75. Not too bad.
Figured id share the experience with you guys. If you buy used stuff i highly recommend doing this before milling and before assembling the engine. I feel much better about it now that i know the actual sizes of everything and how much clearance I have.
Last edited by brad8266; Jan 25, 2007 at 06:54 PM.
Measure twice, cut once. Thanks for pointing this step out. I'm pulling my heads to put in some Cadillac lifters and was going to put some .036" Cometics. However, I think I will invest in a beurette and actually measure my chambers so I know what I've got.
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From: Watertown, NY
Originally Posted by ArKay99
Measure twice, cut once. Thanks for pointing this step out. I'm pulling my heads to put in some Cadillac lifters and was going to put some .036" Cometics. However, I think I will invest in a beurette and actually measure my chambers so I know what I've got.
I am so glad i didnt jump the gun and have them milled beforehand or i would be screwed right now. Id either have to get a smaller cam or sell the heads, or do like a ricer and double stack 2 head gaskets.
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From: Watertown, NY
Originally Posted by Josh
Probably a stupid question that could be easily answered by a search, so please forgive my mini-hijack: What did you use for clay?
Thanks,
Josh
Thanks,
Josh
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From: Watertown, NY
Originally Posted by lastcall190
Nice job man, I'm curious to see what you put down on the 5.3s!
-J
-J
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This may be a stupid question, but I'm new to the CC chambers thing. Do you have to put the springs on to seat the valves or would gravity be enough? Also, did you use a sealing plate or just eyeball it?
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From: Watertown, NY
Originally Posted by Quick Double Nickel
This may be a stupid question, but I'm new to the CC chambers thing. Do you have to put the springs on to seat the valves or would gravity be enough? Also, did you use a sealing plate or just eyeball it?
I eyeballed it up, 57cc filled the chamber and left a nice sized dome on the surface, 56cc was a more flatter surface that i think was more accurate. 55cc started to empty the chamber and 59 overflowed it. It was definitely 56-57cc, not a big margin of error.
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From: Watertown, NY
Originally Posted by PREDATOR-Z
Did you use a modified roller lifter (plunger doesn't plunge)
If not, better do it again
If not, better do it again
Originally Posted by Quick Double Nickel
Where do you get an accurate syringe?
I just went to a drug store and they gave me 2 syringes free when I asked to find some that I could purchase...they come in handy in your shop for other thing too. I use one to remove flud from the clutch resovour and to refill it with clean fluid...use a level and make sure your head is nice and level when you fill it and you can eyeball it and get very close to the correct CCs of your chamber.
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From: Grand Rapids, Michigan
I bought a 50CC syringe from a medical supply store. When CCing heads, you should add a drop of dish soap to the water in the syringe, as this breaks the surface tension and allows a more accurate measurement to be taken. Otherwise you can actually fill the chamber with slightly more water than it holds. The valve springs do not need to be installed, just put a thin layer of grease on the valve seat and push the valve in.
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From: Watertown, NY
Originally Posted by LS1Formulation
When CCing heads, you should add a drop of dish soap to the water in the syringe, as this breaks the surface tension and allows a more accurate measurement to be taken. Otherwise you can actually fill the chamber with slightly more water than it holds.