Milling 452 casting BB heads - how low can you go?? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer Milling 452 casting BB heads - how low can you go??

Print Thread

Page 1 of 2

1

2

Milling 452 casting BB heads - how low can you go?? #197867 01/19/09 10:24 AM 01/19/09 10:24 AM
Joined: Jan 2003 Posts: 4,296 Chicago, IL TonyS451 OP master
TonyS451 OP master Joined: Jan 2003 Posts: 4,296 Chicago, IL	Is it possible to safely mill a 452 casting down to 75cc (from 88cc)? Going on a mild street engine that needs a big compresion boost. BTW, I have the 452's already and want to spend as little as possible on this engine. So switching heads is not what I'm looking into right now. Thanks 2 kids and a dog

Re: Milling 452 casting BB heads - how low can you go?? [Re: TonyS451] #197868 01/19/09 10:33 AM 01/19/09 10:33 AM
Joined: Apr 2008 Posts: 203 florida 7 74fldart enthusiast
74fldart enthusiast 7 Joined: Apr 2008 Posts: 203 florida	i milled some 346s (which is pretty much the same head as a 452 except for changes in the ports ) .055 a few years back and they ccd out at 76cc. i had no problems with them running them on the street for 4 or 5 years until i sold the car. the engine did run a lot better after doing that and a mild home port job. keep in mind that the intake side will need to be milled also.

Re: Milling 452 casting BB heads - how low can you go?? [Re: 74fldart] #197869 01/19/09 10:59 AM 01/19/09 10:59 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 had a thread on this a couple years ago, and there's a few guys who've milled them as much as .10-.120. That creates other issues such as pushrod length being too long and needing to mill the intake flange of the heads a lot, valley pan not fitting as well, etc. It is doable though. Also they say when you mill them that far the stock heads become a lot more crack prone.

Re: Milling 452 casting BB heads - how low can you go?? [Re: DaytonaTurbo] #197870 01/19/09 01:30 PM 01/19/09 01:30 PM
Joined: Mar 2005 Posts: 3,142 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,142 Central NC	I angle milled my 346 heads to 78cc.I would have gone farther if not for the piston hitting the head.By angle milling instead of flat milling you are removing the most metal from the lower(outside)part of the head.I have no issues with pushrods or intake sealing and did not touch the intake side of the head or the intake itself.

Re: Milling 452 casting BB heads - how low can you go?? [Re: gch] #197871 01/19/09 02:05 PM 01/19/09 02:05 PM
Joined: Jan 2003 Posts: 6,392 nielsville, minn. Q quickd100 master
quickd100 master Q Joined: Jan 2003 Posts: 6,392 nielsville, minn.	The factory says max is .060, that should get you close. I've personally milled a set .100 without a problem. After .060 though you increase the chance of the heads cracking, so no guarentees. Dave

Re: Milling 452 casting BB heads - how low can you go?? [Re: quickd100] #197872 01/19/09 02:11 PM 01/19/09 02:11 PM
Joined: Mar 2005 Posts: 576 Texas C ChevyTS mopar
ChevyTS mopar C Joined: Mar 2005 Posts: 576 Texas	60 off the chamber side 74 off the intake side will bring a late 440 from 8.2 to 9.7 perr mopar performance . You will have to shim stock rockers though. T & K Performance

Re: Milling 452 casting BB heads - how low can you go?? [Re: ChevyTS] #197873 01/19/09 03:08 PM 01/19/09 03:08 PM
Joined: Jan 2007 Posts: 780 Woodinville, WA Viol8r super stock
Viol8r super stock Joined: Jan 2007 Posts: 780 Woodinville, WA	I went .050" on some 452's, put me at 74cc. Runs great, right around 9.8:1 with stock flat tops.

Re: Milling 452 casting BB heads - how low can you go?? [Re: gch] #197874 01/19/09 04:13 PM 01/19/09 04:13 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	Quote: I angle milled my 346 heads to 78cc.I would have gone farther if not for the piston hitting the head.By angle milling instead of flat milling you are removing the most metal from the lower(outside)part of the head.I have no issues with pushrods or intake sealing and did not touch the intake side of the head or the intake itself. If you didn't need the intake side milled your machinist definately did not angle mill the heads, also when angle milling the bolt heads will not sit flat on the head, if it is angle mille enough then the bolts will not even start in the holes because the bolt can not go straight in. If the intake was not milled you will end up with vacume leaks on the intake to head mateing surface unless you put a ton of silicone or something on it in that case it will leak soon. Doing angle milling the right way is very involved and not cheap. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: Milling 452 casting BB heads - how low can you go?? [Re: HotRodDave] #197875 01/19/09 04:23 PM 01/19/09 04:23 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	My welder wanted to try to weld up the open chambers in a set of my 906's then mill em flat. live every 24 hour block of time like it's your last day on earth

Re: Milling 452 casting BB heads - how low can you go?? [Re: RapidRobert] #197876 01/19/09 04:30 PM 01/19/09 04:30 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	Speed o motive used to do that. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: Milling 452 casting BB heads - how low can you go?? [Re: HotRodDave] #197877 01/19/09 05:00 PM 01/19/09 05:00 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Thanks for the vote of confidence, I may have him go ahead. He owes me some labor time so I might as well take it out in trade this way live every 24 hour block of time like it's your last day on earth

Re: Milling 452 casting BB heads - how low can you go?? [Re: RapidRobert] #197878 01/19/09 05:29 PM 01/19/09 05:29 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Quote: My welder wanted to try to weld up the open chambers in a set of my 906's then mill em flat. There was someone doing that once (in CA I think) I was going to look into it but along come aluminum heads. I once had .110 off a set of 906 made them closed chamber. cracked after a few years up in the bowls ends up my porting left it 1/16th thick and a small crack opened up!

Re: Milling 452 casting BB heads - how low can you go?? [Re: Dodgem] #197879 01/19/09 05:31 PM 01/19/09 05:31 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Course if i read one more post I'd seen who it was! LOL!!! But they are on CA right??!\|LOL!!

Re: Milling 452 casting BB heads - how low can you go?? [Re: Dodgem] #197880 01/19/09 05:41 PM 01/19/09 05:41 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	it's not your fault, those Canadian winters tend to numb the brain a bit dont they . Sorry couldn't resist live every 24 hour block of time like it's your last day on earth

Re: Milling 452 casting BB heads - how low can you go?? [Re: ChevyTS] #197881 01/19/09 06:59 PM 01/19/09 06:59 PM
Joined: Jan 2003 Posts: 75,012 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,012 U.S.S.A.	Quote: 60 off the chamber side 74 off the intake side will bring a late 440 from 8.2 to 9.7 perr mopar performance . You will have to shim stock rockers though. shimming the rockers is not the correct way to make up for aggressive head milling , the shims are for correcting incorrect rocker geometry

Re: Milling 452 casting BB heads - how low can you go?? [Re: HotRodDave] #197882 01/19/09 08:40 PM 01/19/09 08:40 PM
Joined: Mar 2005 Posts: 3,142 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,142 Central NC	Quote: Quote: I angle milled my 346 heads to 78cc.I would have gone farther if not for the piston hitting the head.By angle milling instead of flat milling you are removing the most metal from the lower(outside)part of the head.I have no issues with pushrods or intake sealing and did not touch the intake side of the head or the intake itself. If you didn't need the intake side milled your machinist definately did not angle mill the heads, also when angle milling the bolt heads will not sit flat on the head, if it is angle mille enough then the bolts will not even start in the holes because the bolt can not go straight in. If the intake was not milled you will end up with vacume leaks on the intake to head mateing surface unless you put a ton of silicone or something on it in that case it will leak soon. Doing angle milling the right way is very involved and not cheap. I'm no engine builder or machinist for that matter.All I can tell you is he angle milled the heads and I have not had to do anything extra or fancy and it all works and fits fine.I have changed intakes on the motor and had no problems with alignment or starting bolt holes.I do seem to remember him saying something about spotfacing the bolt holes.Make any sense He is an excellent engine buider and drag racer as well.

Re: Milling 452 casting BB heads - how low can you go?? [Re: gch] #197883 01/19/09 09:10 PM 01/19/09 09:10 PM
Joined: Mar 2005 Posts: 576 Texas C ChevyTS mopar
ChevyTS mopar C Joined: Mar 2005 Posts: 576 Texas	See if you can find out how he milled the heads exactly. That would good info to have. I have angel milled a few sets and it is no easy chore. T & K Performance

Re: Milling 452 casting BB heads - how low can you go?? [Re: ChevyTS] #197884 01/19/09 09:17 PM 01/19/09 09:17 PM
Joined: Mar 2005 Posts: 576 Texas C ChevyTS mopar
ChevyTS mopar C Joined: Mar 2005 Posts: 576 Texas	The set I have is 60 cc. 4959561-trackpics061.jpg (502 downloads) T & K Performance

Re: Milling 452 casting BB heads - how low can you go?? [Re: ChevyTS] #197885 01/20/09 12:05 AM 01/20/09 12:05 AM
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	Tony I milled the 452's .060 that were on the 383 that was in my boys Dart a few years ago. I also milled the intake side about the same amout. I had no issue's at all and everything fit fine with no leaks. I also milled the 906's on the 440 in my 63 .060 and I can tell you the chamber's went from .085 to .090 deep to .025 to .030 deep. I also had the intake sides milled and they fit fine. No leaks yet. I myself dont like to go much more then .060 as then it starts getting into fitting problems. Course when cash is tight we have to find cheap ways to raise the comp. This pic is after I had my 906's milled .060. Ron Last edited by 383man; 01/20/09 12:08 AM.

Re: Milling 452 casting BB heads - how low can you go?? [Re: 383man] #197886 01/22/09 01:27 AM 01/22/09 01:27 AM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	So what is the price to get 0.060 milled off two heads and 0.074 or whatever milled off the two port faces? When I checked years ago the price was comparable to a new set of pistons. R.

Re: Milling 452 casting BB heads - how low can you go?? [Re: dogdays] #197887 01/22/09 06:18 AM 01/22/09 06:18 AM
Joined: Mar 2005 Posts: 576 Texas C ChevyTS mopar
ChevyTS mopar C Joined: Mar 2005 Posts: 576 Texas	100.00 bucks. T & K Performance

Re: Milling 452 casting BB heads - how low can you go?? [Re: Dodgem] #197888 01/22/09 09:36 AM 01/22/09 09:36 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	One thing that gets missed in milling is that we Or many of us go from a stock .022 steel shim gasket that would have been on stock to fel pro type composition (way better)which are about .038 so we have found in the past .060/.045 (or .066 / .050)is a good mill combo. the thicker gasket makes it like your starting out with the deck face .016 thicker

Page 1 of 2

1

2

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1