Re: 360 power numbers iron vs aluminum heads
[Re: DaytonaTurbo]
#588148
01/20/10 04:28 AM
01/20/10 04:28 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
With that baby cam, aftermarket heads would be a colossal waste of cash. You've got no duration and you've got no lift. For the money, aftermarket heads will do basically nothing for you.
Totally agree, it'll be a waiste, unless you have big future plans for a nice build, you might as well throw on a stock set of heads & call it a day.
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Re: 360 power numbers iron vs aluminum heads
[Re: joedust451]
#588149
01/21/10 09:33 PM
01/21/10 09:33 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Car Craft did a test of an iron vs. aluminum head. The object of the test was to try to determine is the material used made any difference. They used SBC Dart heads and tried to keep everything as close to identical as possible, except for the material.
Results, no difference that was enough to matter.
Obviously, there is more to the test that HP, they tried to heat soak them to see if that made a difference, they tried to see if detonation was more likely with one material, etc. No differences noted. This was a typical street build type engine, no crazy compression ratios or wild cams.
FWIW
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 360 power numbers iron vs aluminum heads
[Re: Supercuda]
#588150
01/21/10 10:43 PM
01/21/10 10:43 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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off topic but with you being in the middle of building the short block I'd suggest some KB pistons to raise the CR (& maybe get quench w the open heads which'd take extra machining of the open ch head recesses but if alum heads are in your current budget then you could afford it) and bowl hog/carefull home port your (current) heads. Been reading some magazine builds in some old issues & I'm (very) impressed with what they did w the iron heads.
live every 24 hour block of time like it's your last day on earth
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Re: 360 power numbers iron vs aluminum heads
[Re: mopartruckguy]
#588152
01/21/10 11:52 PM
01/21/10 11:52 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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You mentioned 8.5-8.75 CR so I'm assuming stock dish pistons way down in the hole? and actual is more likely in the high 7's. You will not have quench (.035-.040" piston to head) which would enable you to run a much higher CR on the same octane and your CR will still be woefully low. Yes you will be severely dissapointed  .
live every 24 hour block of time like it's your last day on earth
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Re: 360 power numbers iron vs aluminum heads
[Re: RapidRobert]
#588153
01/22/10 08:41 AM
01/22/10 08:41 AM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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The parts have to work together... Tha cam is too small and the pistons too far down in the hole for anythign to work together. So you wwill lose some weight, and it might ping with more static compression... Otherwise it should loose response from larger ports and valves and nothing else.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: 360 power numbers iron vs aluminum heads
[Re: Supercuda]
#588154
01/22/10 09:01 AM
01/22/10 09:01 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Car Craft did a test of an iron vs. aluminum head. The object of the test was to try to determine is the material used made any difference. They used SBC Dart heads and tried to keep everything as close to identical as possible, except for the material.
Results, no difference that was enough to matter.
Obviously, there is more to the test that HP, they tried to heat soak them to see if that made a difference, they tried to see if detonation was more likely with one material, etc. No differences noted. This was a typical street build type engine, no crazy compression ratios or wild cams.
FWIW
but those heads were identical geometry, diff material.
the compression increase, you should see 3-4% hp increase due to the compression, so 10-15 HP. the additional flow, because the cam is so small, might net an additional 10-20 HP max.
if you want to significantly boost power without hurting drivability, move up to a lunati voodoo 60400 or 60401. the additional lift, and duration at lifts above .050 will make a big improvement.
a cheaper alternative would be to pick up hughes' assembled iron ram heads w/LA intake pattern, they're $700/pr. and using magnum rockers gives you nominally 7% more lift than the LA rockers.
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2017 Grand Cherokee Overland
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Re: 360 power numbers iron vs aluminum heads
[Re: mark7171]
#588156
01/22/10 08:17 PM
01/22/10 08:17 PM
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Joined: May 2004
Posts: 1,522
Ste-Sophie, Quebec, Canada
Wedgeman
pro stock
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pro stock
Joined: May 2004
Posts: 1,522
Ste-Sophie, Quebec, Canada
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Quote:
That mild cam 360" would work well with magnum heads. For cruising around the (.430/.444") old 340" cam is spectacular. Find a dual plane intake and 600 edelbrock carb. Headers optional, but will give some low end with the correct closed exhaust.
I have one I could spare....
Dan
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Re: 360 power numbers iron vs aluminum heads
[Re: mopartruckguy]
#588157
01/23/10 05:42 AM
01/23/10 05:42 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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If you are going from unported iron 360 heads to the Edelbrock heads, the Edelbrock heads should flow at least 27 cfm (@28") better @ 0.400" lift (about 232 cfm, Edelbrock rating?) than the stock heads (205 cfm? on a good head), which on paper should be good for about 56 HP? The small cam will not let the engine REV to the RPM needed to see the peak power gains, but you should still see reasonable power gains upto the engine RPM limit. You could port the iron heads, and use larger valves to get the iron heads to flow as well as the Edelbrock heads, but by the time your done you will have invested almost as much money in the stock heads as it would have been to buy the Edelbrock heads. Anyhow, it would make for an interesting dyno test? I would not spend the extra $$$ on the Edelbrock heads in your mild engine combination unless you plan to make more power in the future.
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