Posted By: rexus31
Who has milled their Stealths? - 05/02/09 02:36 PM
How much did you take off? What is your compression ratio? Chamber volume?
As it stands right now, if I bolt my Stealths on my 383 (.030 over, slug .035 in the hole) I'm at 8.8:1. This is basically a stock spec street motor with a .450 lift cam; very mild. I got the Stealths becasue of their affordability and close resemblance to a stock casting more so than their added performance. I'm just wondering if I should mill them or run them as is.
Posted By: komninon
Re: Who has milled their Stealths? - 05/02/09 02:45 PM
my motor is still at the machine shop. is a 440 with stealth heads. i think they milled the heads .050 use fel -pro 1105 gaskets
now it is 78cc and compression 10.6 to 1. i will have all the paperwork next week after the dyno.
Posted By: Classof70Chally
Re: Who has milled their Stealths? - 05/02/09 05:19 PM
I left mine unmilled for a 84cc chamber (confirmed). This with my pistons at zero deck and a .045 gasket gives me a CR of 10.0 to 1 which is what I was shooting for with my cam combo and pump swill.
Posted By: slippery440
Re: Who has milled their Stealths? - 05/03/09 01:45 AM
Milled .075 started at 84 cc now 72 cc. We had to take .095 o9ff the intake side.I would take half of the head and then the rest off the intake manifold,
Posted By: rexus31
Re: Who has milled their Stealths? - 05/03/09 02:54 AM
Wow....using a web based milling calculator, it would only take .040 to get them down to 72cc. Based on my calculations, milling them .075 would give you 62cc chambers. What's your compression ratio? 440 or 383?
Posted By: 1_WILD_RT
Re: Who has milled their Stealths? - 05/03/09 03:14 AM
I think do to the chamber shape the first .025 would probably be more cc's than a std head but by .035 you'd need to take more material to get the same effect... BTW This is just a guess based on my visual impression of the chamber shape..
Posted By: tex013
Re: Who has milled their Stealths? - 05/03/09 07:16 AM
cc'd mine at 86/7.milled down for 78cc
Tex
Posted By: challenger73400
Re: Who has milled their Stealths? - 05/03/09 12:44 PM
milled mine .075" and got 72cc for 12:1 w/flat tops
Posted By: slippery440
Re: Who has milled their Stealths? - 05/03/09 12:47 PM
We cc the head 3 times. Once before and then at .045 and then at .075. Kind of suprised me too.We figure about 11.5 or 12 to 1 compression.Block at zero and flat top pistons at .005 out.
Posted By: maximum entropy
Re: Who has milled their Stealths? - 05/04/09 03:50 PM
i got a set of the cnc stealths. the chambers were all over the place- 83 to 85.5. i equalised them at 85.5 and had them milled .040 and they measured 76 cc if i remember.
Posted By: maximum entropy
Re: Who has milled their Stealths? - 05/04/09 05:31 PM
the machinist i took it to charged me about 70.00. he said he prefers to shave the intake only, to compensate, not the intake side of the heads. not the way i would do it, but, hey, making your machinist irritated seems like a really bad idea, you know?
Posted By: maximum entropy
Re: Who has milled their Stealths? - 05/04/09 08:45 PM
he didn't take any off of the intake face of the heads, and i haven't mocked up the intake yet- it'll be a couple of weeks. the block was decked .025, btw. i can pm you with the results, if you like?
Posted By: Frederick
Re: Who has milled their Stealths? - 05/05/09 05:39 PM
Milled 0.050" to get at 75cc chambers.
Now at 9.3:1 with a +0.030 383 with pistons 0.040 down.
