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Milling Edelbrock heads #1325349 10/24/12 07:17 AM 10/24/12 07:17 AM
Joined: Sep 2006 Posts: 1,139 West Tennessee R rbstroker OP super stock
rbstroker OP super stock R Joined: Sep 2006 Posts: 1,139 West Tennessee	How much has to be milled from the block face of Edelbrock's big block 84cc (or MP452) heads in order to reduce combustion chamber size by 10cc? This is the land of the free because of the brave

Re: Milling Edelbrock heads [Re: rbstroker] #1325350 10/24/12 07:41 AM 10/24/12 07:41 AM
Joined: Nov 2004 Posts: 843 Suffolk,VA I ireland383 super stock
ireland383 super stock I Joined: Nov 2004 Posts: 843 Suffolk,VA	every .010 removed is around 2cc. So .050 would do it.

Re: Milling Edelbrock heads [Re: ireland383] #1325351 10/24/12 01:32 PM 10/24/12 01:32 PM
Joined: Aug 2003 Posts: 43,309 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,309 Bend,OR USA	Quote: every .010 removed is around 2cc. So .050 would do it. Don't forget about the intake surface Call Edelbrock on how much needs to be taken off the intake surface for every .010 taken off of the head surfaces Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Milling Edelbrock heads [Re: Cab_Burge] #1325352 10/24/12 01:58 PM 10/24/12 01:58 PM
Joined: Aug 2003 Posts: 8,716 Baltimore/Denver 64Post master
64Post master Joined: Aug 2003 Posts: 8,716 Baltimore/Denver	Quote: Quote: every .010 removed is around 2cc. So .050 would do it. Don't forget about the intake surface Call Edelbrock on how much needs to be taken off the intake surface for every .010 taken off of the head surfaces .0123�?

Re: Milling Edelbrock heads [Re: 64Post] #1325353 10/24/12 04:56 PM 10/24/12 04:56 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: Quote: Quote: every .010 removed is around 2cc. So .050 would do it. Don't forget about the intake surface Call Edelbrock on how much needs to be taken off the intake surface for every .010 taken off of the head surfaces .0123�? Dave you are right as they say for every .010 off the head surface to remove .012 from the intake side. But that said we removed .040 off the RPM heads on my boys 400 to get 10.6 comp and we only cut the same .040 off the intake side and everything fit good. I always cut a tad less off the intake side then what they say and if it still wont fit right or the bolt holes wont line up you can always cut more off. Ron Last edited by 383man; 10/24/12 04:56 PM.

Re: Milling Edelbrock heads [Re: ireland383] #1325354 10/24/12 05:17 PM 10/24/12 05:17 PM
Joined: Dec 2010 Posts: 208 Norrland, Sweden Swedcharger67 enthusiast
Swedcharger67 enthusiast Joined: Dec 2010 Posts: 208 Norrland, Sweden	Quote: every .010 removed is around 2cc. So .050 would do it. It's about right if the combustion chamber is round as in a cast iron 452 head. If you have a quench area, pie-shaped combustion chamber you will need to remove more than .050 to get to the 10cc smaller chamber. Martin, 67 Charger, 512 cui, E85, MegaSquirt MS3X sequential ignition & injection

Re: Milling Edelbrock heads [Re: 383man] #1325355 10/24/12 07:23 PM 10/24/12 07:23 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	I'm assuming the .010"/.0123" rule is correct. I would mockup the heads/head gaskets then the intake & see if the port/bolt hole alignment is dead on & if so then adhere to that rule. Otherwise mill the decks only then mockup & see how much needs to be milled from either the heads or the intake. It'd be 2 extra trips to the machine shop but when done it would be perfect & you'll soon forget about the extra trips/expense when you beat your opponent or are laying a block long stretch of rubber because you took the time (& expense) to get every subsystem dead on live every 24 hour block of time like it's your last day on earth

Re: Milling Edelbrock heads [Re: RapidRobert] #1325356 10/25/12 12:04 AM 10/25/12 12:04 AM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	Don't forget to check P/V clearance afterwards. Must be small blocks that mill .011" off the intake surface for every .010" off the deck.

Re: Milling Edelbrock heads [Re: 383man] #1325357 10/26/12 01:44 PM 10/26/12 01:44 PM
Joined: Sep 2006 Posts: 1,139 West Tennessee R rbstroker OP super stock
rbstroker OP super stock R Joined: Sep 2006 Posts: 1,139 West Tennessee	Quote: Quote: Quote: Quote: every .010 removed is around 2cc. So .050 would do it. Don't forget about the intake surface Call Edelbrock on how much needs to be taken off the intake surface for every .010 taken off of the head surfaces .0123�? Dave you are right as they say for every .010 off the head surface to remove .012 from the intake side. But that said we removed .040 off the RPM heads on my boys 400 to get 10.6 comp and we only cut the same .040 off the intake side and everything fit good. I always cut a tad less off the intake side then what they say and if it still wont fit right or the bolt holes wont line up you can always cut more off. Ron 383man. Do you recall the combustion chamber size before and after shaving .040 from the RPM heads? I just got off the phone with edelbrock tech, and they couldn't give me any numbers. Cut, measure, cut and measure until getting the desired results is going to be pricey. I'd like to be able to tell the machine shop how much to cut. This is the land of the free because of the brave

Re: Milling Edelbrock heads [Re: rbstroker] #1325358 10/26/12 01:57 PM 10/26/12 01:57 PM
Joined: Aug 2003 Posts: 8,716 Baltimore/Denver 64Post master
64Post master Joined: Aug 2003 Posts: 8,716 Baltimore/Denver	FWIW, Jeff @ MCH told me 1cc per .010�. I wanted 82cc chambers so he cut mine .020�. You may want to try an email to him to confirm.

Re: Milling Edelbrock heads [Re: rbstroker] #1325359 10/26/12 02:09 PM 10/26/12 02:09 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	] 383man. Do you recall the combustion chamber size before and after shaving .040 from the RPM heads? I just got off the phone with edelbrock tech, and they couldn't give me any numbers. Cut, measure, cut and measure until getting the desired results is going to be pricey. I'd like to be able to tell the machine shop how much to cut. I wish I did but it was a few years (at least 5) ago and I honestly dont remember. I mean of course they were the 84cc heads but I dont remember what cc's we figured for the 10.6 comp as I dont even remember the exact piston height on his 400. Very sorry. Ron Last edited by 383man; 10/26/12 02:12 PM.

Re: Milling Edelbrock heads [Re: 383man] #1325360 10/26/12 03:38 PM 10/26/12 03:38 PM
Joined: Sep 2006 Posts: 1,139 West Tennessee R rbstroker OP super stock
rbstroker OP super stock R Joined: Sep 2006 Posts: 1,139 West Tennessee	Got it. http://www.moparts.org/Tech/Archive/bb/9.html Thank you guys. Thanks especially to Andy Finkbeiner. This is the land of the free because of the brave

Re: Milling Edelbrock heads [Re: rbstroker] #1325361 10/26/12 04:11 PM 10/26/12 04:11 PM
Joined: Dec 2010 Posts: 208 Norrland, Sweden Swedcharger67 enthusiast
Swedcharger67 enthusiast Joined: Dec 2010 Posts: 208 Norrland, Sweden	Quote: Got it. http://www.moparts.org/Tech/Archive/bb/9.html Thank you guys. Thanks especially to Andy Finkbeiner. Sanity check: Assuming bore 4.375. Shaving off .01 in is 2.46cc. Assuming RPM quench area 30% of combustion chamber. Shaving off .05 gives .7x5x2.46= 8.6 cc Seems within range? Martin, 67 Charger, 512 cui, E85, MegaSquirt MS3X sequential ignition & injection

Re: Milling Edelbrock heads [Re: Swedcharger67] #1325362 10/26/12 05:52 PM 10/26/12 05:52 PM
Joined: Aug 2003 Posts: 8,716 Baltimore/Denver 64Post master
64Post master Joined: Aug 2003 Posts: 8,716 Baltimore/Denver	Sounds like a few chambers need to be cc�d to first, then the heads milled.

Re: Milling Edelbrock heads [Re: 64Post] #1325363 11/03/12 09:06 PM 11/03/12 09:06 PM
Joined: Sep 2006 Posts: 1,139 West Tennessee R rbstroker OP super stock
rbstroker OP super stock R Joined: Sep 2006 Posts: 1,139 West Tennessee	After referring back to my written plan, I realize that my goal is to be able to use pump gas. I installed the heads as cast for a static compression ratio of 8.87:1 That should do it. Cam selection comes after some testing of the current combination. 7447524-MP452heads2.JPG (252 downloads) This is the land of the free because of the brave

Re: Milling Edelbrock heads [Re: rbstroker] #1325364 11/08/12 02:27 PM 11/08/12 02:27 PM
Joined: Jan 2003 Posts: 3,488 Annapolis, MD, USA V Vert master
Vert master V Joined: Jan 2003 Posts: 3,488 Annapolis, MD, USA	Dodn't you need higher compression for equal power with aluminum heads? They run so much cooler I thought cylinder pressure dropped off as a result. Vert > [img]http://i.imgur.com/JHXmM.jpg[/img]71 Barracuda vert[/url] \| Hemi idling on dyno \| Hemi Dyno pull

Re: Milling Edelbrock heads [Re: Vert] #1325365 11/08/12 03:08 PM 11/08/12 03:08 PM
Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY B bobs66440 top fuel
bobs66440 top fuel B Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY	Quote: Dodn't you need higher compression for equal power with aluminum heads? They run so much cooler I thought cylinder pressure dropped off as a result. I had heard similar to this also many times. That you can run 1 point higher in CR relative to cast iron due to the cooling of aluminum and still avoid detonation. So, when I was building my engine I did quite a bit of research regarding this. I couldn't find any real conclusive proof that this is true, though many believe it. There are so many other factors involved, it's difficult to prove apparently. I think Car Craft actually did a relatively scientific experment trying to prove it and they couldn't.

Re: Milling Edelbrock heads [Re: bobs66440] #1325366 11/08/12 03:17 PM 11/08/12 03:17 PM
Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY B bobs66440 top fuel
bobs66440 top fuel B Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY	Here http://www.carcraft.com/techarticles/ccrp_0602_iron_versus_aluminum_cylinder_heads_test/viewall.html

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