Re: Iron heads vs. Stealths
[Re: ireland383]
#440885
08/18/09 09:11 PM
08/18/09 09:11 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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If you have quench you for sure can go considerably higher than 10:1(measured) w alum(not sure how much exactly)
live every 24 hour block of time like it's your last day on earth
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Re: Iron heads vs. Stealths
[Re: B5 Bee]
#440886
08/18/09 11:58 PM
08/18/09 11:58 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
That's a correct statement, everything the same (ports, valves, combustion chamber), an iron head will make more power.
It takes about a 1 point increase in compression, with everything else the same, for aluminum heads to make the same power.
Where's the proof on that? I'd be very interested in reading it because the only article I've ever read where they tackled this subject on the dyno showed no change in power output between the two materials, everything else being equal...
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Re: Iron heads vs. Stealths
[Re: ireland383]
#440887
08/19/09 12:00 AM
08/19/09 12:00 AM
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Joined: Nov 2004
Posts: 2,825 Sk. Canada
RemCharger
master
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master
Joined: Nov 2004
Posts: 2,825
Sk. Canada
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Quote:
Why would my motor feel like it has more power with my 346 heads shaved .030 vs the new 440 source heads? It has KB 400 pistons and both heads had the same head gaskets.
I think something isn't set right. Gas pedal,,timing,,puel press,,float level,, rocker geometry,, The other issue is how fast did , and how fast does, it run the 1/4?
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Re: Iron heads vs. Stealths
[Re: ireland383]
#440888
08/19/09 03:17 AM
08/19/09 03:17 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
Why would my motor feel like it has more power with my 346 heads shaved .030 vs the new 440 source heads? It has KB 400 pistons and both heads had the same head gaskets.
What head gasket? The stealth heads need to use the larger diameter head gasket. The fel-pro 1009 has too small a bore diameter. The standard Fel-Pro rebuild kit gasket 8519-PT seems to fit OK with the stealth heads.
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Re: Iron heads vs. Stealths
[Re: goldmember]
#440890
08/19/09 04:56 AM
08/19/09 04:56 AM
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Joined: Jan 2005
Posts: 4,862 the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
"feels like" isn't really very accurate. As others have pointed out the are some tuning issues likley to be found,but you'll need to test. I understand your ??? as I've found through track testing that things are far from certain in parts swapping,even if all the mags (and internet pros) say otherwise. LOL Good luck to you.
I'm with goldmember on this one. My 96 Mustang GT feels much faster than my 440 Charger. It is not. They both feel way faster than my old 70 Skylark 455... and again, not even close.
Possibly the extra port volume killed enough low end to soften the experience a bit? It should be way better in the top end, but unaddressed there are tons ov issues that could limit that too. When i swapped a ported Street Dominator onto my stock 72 440 i got nothing out ov it. Nothing at all in the SOTP. After jetting up and up and up and up again, i couldn't keep the back tires from spinning. The difference was VAST. Also, if the bigger heads didn't improve the lot, perhaps the 346's were not the limiting factor. You might have a glaringly weak link in your combo that has now been multiplied?
Regardless, you've done the best thing... replaced that stock junk. Figure it out and it should rock. Provided there is nothing WRONG with your particular heads, they should out-perform even max-ported stock heads any day.
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Re: Iron heads vs. Stealths
[Re: RemCharger]
#440892
08/19/09 07:04 AM
08/19/09 07:04 AM
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Joined: Nov 2004
Posts: 843 Suffolk,VA
ireland383
OP
super stock
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OP
super stock
Joined: Nov 2004
Posts: 843
Suffolk,VA
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I think something isn't set right. Gas pedal,,timing,,puel press,,float level,, rocker geometry,, The other issue is how fast did , and how fast does, it run the 1/4?
Never had it to the track. I'm sure I gained more top end, but killed the low end. Partly I think it is the cam (275DEH) part # 21-406-4 which worked better with the iron heads. When I look this cam up at Summit, It is for a restrictive exhaust and an application where low end torque could be less. Would I benefit by going to a lunati 60302?
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Re: Iron heads vs. Stealths
[Re: DaytonaTurbo]
#440893
08/19/09 10:50 AM
08/19/09 10:50 AM
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Joined: Jan 2003
Posts: 21,083 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,083
Niles , Ohio
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WE just put mt semi ported over sized valves 516s on my kids 62 300.The 413 heads are super restrictive.They had 2.02 and like 1.60 exhausts.He still runs 13.6.He dropped maybe .05 changing them.He is spinning more off the line and the cam is holding it back on the top end.I figured they would be good for at least 3 tenths difference.Change one thing you have to change another.With the old heads it was done at like 5500.Now it wants to pull but the cam just wont let it.Rocky
Chrysler Firepower
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