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milled 915 #1028407 07/08/11 03:48 PM 07/08/11 03:48 PM
Joined: Mar 2006 Posts: 129 wisconsin usa M moretork03 OP member
moretork03 OP member M Joined: Mar 2006 Posts: 129 wisconsin usa	what is the least cc's you can get to by milling the 915 head

Re: milled 915 [Re: moretork03] #1028408 07/08/11 05:26 PM 07/08/11 05:26 PM
Joined: Oct 2007 Posts: 735 New York R/T1968R/T super stock
R/T1968R/T super stock Joined: Oct 2007 Posts: 735 New York	I have a set thats milled .060. I cant remember the ccs, but it has to be in the low 70s at least. Im sure you can take it down more, but milling the intake face and lining everything up begins to get tricky.

Re: milled 915 [Re: R/T1968R/T] #1028409 07/09/11 02:12 AM 07/09/11 02:12 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Quote: I have a set thats milled .060. I cant remember the ccs, but it has to be in the low 70s at least. Im sure you can take it down more, but milling the intake face and lining everything up begins to get tricky. and expensive, i have a set that are just milled to clean they came in at 80cc, with valves that are not concaved i bet they would be right around 78cc

Re: milled 915 [Re: moretork03] #1028410 07/10/11 01:30 AM 07/10/11 01:30 AM
Joined: Jan 2007 Posts: 1,395 LAKE TEXOMA oldman pro stock
oldman pro stock Joined: Jan 2007 Posts: 1,395 LAKE TEXOMA	It will also depends on what pistons you have ,you can check what you have now with clay put your clay on top of piston and bolt on head turn over and measure also you can adjust a little with different head gasket thickness, but as stated you'll have to mill the intake ,I have noticed that even some heads, that have just been surfaced makes it hard to bolt up some of the new aluminum intakes. you never walked in that mans shoes or seen things through his eyes and stood and watched with helpless hands while the heart inside you dies, but for the grace of god it could be you instead of him.

Re: milled 915 [Re: ademon] #1028411 07/10/11 02:12 AM 07/10/11 02:12 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	I've heard of some guys cutting .100-.120 off 452's to really cut their chambers down to size for use on smogger low-cr big blocks. The problems are like said, getting the intake and valley tray to line up, valvetrain geometry becomes an issue because you really need shorter pushrods by that point and lastly by that much milling the heads become very crack prone.

Re: milled 915 [Re: DaytonaTurbo] #1028412 07/10/11 10:57 PM 07/10/11 10:57 PM
Joined: Aug 2005 Posts: 4,799 ILL M MLR426 master
MLR426 master M Joined: Aug 2005 Posts: 4,799 ILL	Quote: I've heard of some guys cutting .100-.120 off 452's to really cut their chambers down to size for use on smogger low-cr big blocks. The problems are like said, getting the intake and valley tray to line up, valvetrain geometry becomes an issue because you really need shorter pushrods by that point and lastly by that much milling the heads become very crack prone. I'ved milled some 100 to 125 thous. You will have to cut the intake runner side of the head to straighten up the intake alignment and cut the intake runner part of the gasket off the valley pan and use paper gaskets and silacone to seal the valley pan and intake,thats not an issue. Mostly used this way to jump compression on any combo. Haven't seen any cracks on heads milled this way although special care should be taken when torqueing heads down, at least a 4 step method until you get to the final torque so their is no extra stress on the castings. logan426 Last edited by Logan426; 07/10/11 11:01 PM.

Re: milled 915 [Re: MLR426] #1028413 07/11/11 12:21 AM 07/11/11 12:21 AM
Joined: Mar 2006 Posts: 129 wisconsin usa M moretork03 OP member
moretork03 OP member M Joined: Mar 2006 Posts: 129 wisconsin usa	i wonder if there is a way to tell how much my heads were cut? trying to determine how much compression was gained, its matched with a TM7 intake

Re: milled 915 [Re: moretork03] #1028414 07/11/11 12:40 AM 07/11/11 12:40 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Quote: i wonder if there is a way to tell how much my heads were cut? trying to determine how much compression was gained, its matched with a TM7 intake If you CC the heads there's a formula to figure out how much they've been milled. I think the head thickness can also be measured but I don't know what the spec is.

Re: milled 915 [Re: DaytonaTurbo] #1028415 07/11/11 12:41 AM 07/11/11 12:41 AM
Joined: Jan 2003 Posts: 75,042 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,042 U.S.S.A.	Quote: I've heard of some guys cutting .100-.120 off 452's to really cut their chambers down to size for use on smogger low-cr big blocks. The problems are like said, getting the intake and valley tray to line up, valvetrain geometry becomes an issue because you really need shorter pushrods by that point and lastly by that much milling the heads become very crack prone. You almost have that correct, valvetrain geometry is not affected by milling the deck surface of the heads. One can mill the deck surface all they want , the rocker to valve geometry NEVER changes, the only thing that changes is pushrod length. If this were something that had rocker attachment like a smallblock chevy then yes you will change the valvetrain geometry if you don't get a shorter pushrod.

Re: milled 915 [Re: moretork03] #1028416 07/11/11 12:43 AM 07/11/11 12:43 AM
Joined: Jan 2003 Posts: 75,042 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,042 U.S.S.A.	Quote: i wonder if there is a way to tell how much my heads were cut? trying to determine how much compression was gained, its matched with a TM7 intake Measure the head bolt boss under the exhaust manifold mounting surfacing , factory they seem to come in right about 1.000

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