Posted By: roy2345
stealth vs 906 Heads - 03/12/10 01:56 PM
I am currently having my engine built and was curious is changing my 906 Heads worth it for my application. I have the voodo cam 60301 and it's bored .030. I have the HP manifolds as well with a Edl performer intake and 750 holley. I plan to drive mine more on the streets with the occasional horse play and tire burn out. I ask because the guy doing my Machine work is charging around 3 cenos for the 3 angle valve job and all. And if I had the 906 ported a little would that be equal performance to the stealths? Just curious.
Posted By: Mr.Yuck
Re: stealth vs 906 Heads - 03/12/10 02:04 PM
well since you are using logs and a Performer intake and not an RPM I see no reason to port or buy the stealth heads. That's not much of a cam so I think your 906 heads and current work will be fine. You can run 12's with stock 906 heads on a very mild 440, so I think you'll be fine.
Posted By: roy2345
Re: stealth vs 906 Heads - 03/12/10 02:09 PM
oops its the lunati 60302 cam. So I would never really even tap into that level of performance with my cam etc to even notice a port job on my 906 heads?
Posted By: Mr.Yuck
Re: stealth vs 906 Heads - 03/12/10 02:16 PM
porting is always a good idea, but since you are using non-performace exhaust and an intake not much better than stock I doubut you will see the advantage. If you went w/ headers, RPM or S/D intake and 3.91's you'd see the difference. I ran 12.90's w/ stock 906's on mild 440. The valve job and angle cut will help, also if you plan on adding to the build later the porting will help. The problem is the cost. It's probably going to be cheaper just to buy the stealth heads in the long run. I mean you reach $800 pretty quick when you start grinding, plus it already has 2.14/1.81 valves. 906's have 2.08/1.74 valves. If this is a car you just want to beat around the street with I'd just stick with your fresh 906's.
Posted By: DaytonaTurbo
Re: stealth vs 906 Heads - 03/12/10 05:39 PM
Stealths are going to flow more than a mildly tweaked set of 906's. I agree with swingin, your combo is too mild to benefit much from the stealths. I would leave your heads bone stock for now, don't invest anything into them. Then later on down the road if you choose to step up to more cam like the 60304, rpm intake, 850 carb, add a set of headers, then you'll be able to put the extra flow of aftermarket heads to use.
Posted By: roy2345
Re: stealth vs 906 Heads - 03/12/10 07:54 PM
Thanks fellas! Yall have answered my questions. I'll hang in there with the 906's. My aluminum intake isn't much better performance then my stock intake?
Posted By: roy2345
Re: stealth vs 906 Heads - 03/13/10 02:46 AM
sorry it's the rpm performer intake for the 440....idle to 5600 rpm
Posted By: Dodgem
Re: stealth vs 906 Heads - 03/13/10 01:18 PM
Get stealth heads before spending any money on iron.
First it will be $300 for valve job and $200 for guides and $200 for new valves (a must IMO) and $100 for new valve springs + any port work and you still have 40 year old crack prone heads. You should have new retainers and keepers too
Eddy heads are more but worth it as the stealths are well "Chinese".
Posted By: roy2345
Re: stealth vs 906 Heads - 03/15/10 12:29 AM
Why would the 906's crack? They were fine when the engine was torn down other then valve guide seals.
Posted By: Dodgem
Re: stealth vs 906 Heads - 03/15/10 01:06 AM
Cast iron has a tendency to get brittle with age and heat cycles.
Posted By: 383man
Re: stealth vs 906 Heads - 03/15/10 03:33 AM
I do run ported 906's but if the Stealth heads had been out when I built my 440 I would have bought them. That said the 906's are holding up fine but I feel I could go faster with a nice aluminum head. Ron
All of my ported iron heads have cracked sooner or later. Usually right below the center exhaust ports. Those two exhaust valves are close together and get HOT!!! If you going to be in the hobby for a while, get the stealths. They will grow with you as your need for performance does (it's a sickness, just ask my wife).
Posted By: jbcuda
Re: stealth vs 906 Heads - 03/15/10 10:02 PM
Mine done the same thing bout two months ago so I ordered stealths and hopefully get to put them on shortly they look great
Posted By: GTX MATT
Re: stealth vs 906 Heads - 03/15/10 10:38 PM
Roy, I would go with the Stealths. One of the magazines tested a pretty average 440 back to back with 906 heads and the Edelbrocks, which flow in the range of the Stealths, probably just a little more. Anyway, it was a 440, 9:1, Comp XE268 (which is similar to your cam, just a tighter lobe seperation with 112 degrees and its 224/230 duration. Eddy RPM intake and 1 7/8 headers. They dynoed 399 with the 906 heads, and 473 ft lbs of torque. With the Eddies it was 456 horsepower and 514 ft lbs of torque. Peak torque was at the same RPM and peak horsepower went up only 200 rpm.
I think even a stock HP engine would benefit 20-30 horse from Eddies or Stealths.
Posted By: roy2345
Re: stealth vs 906 Heads - 03/16/10 06:34 AM
not porting the 906 just 3 angle valve job.
But if he wants to start 'somewhere'..that or a nice used LD340...
there is better options..
