You can get ready to drop in iron heads for $600 a set (just need the rockers). Can also get aluminum heads for $2000 a pair from Hughes

 

I bought brand new, not rebuilt iron heads, complete with valves for $579.00

 

hate to ask, so how much lift your springs good for on those iron heads? I would like a spring that could handle 0.600 in lift. For $200-300 buck I would go aluminum. I'm wanting to run 9.8cr and run 87 octane gas (yeah that cheap stuff). I would like to get my truck to 350-380rwhp, as that pretty easy basic street fun truck. I live in Canada, so hey gas is really pricey here, dang carbon tax.

 

They are stuck springs and start to float at way before that. No I got along heads with upgraded springs that will handle that lift with no problem. I think the springs were $300 for all of them and they can be used on the iron heads. The $600 I don't was for updated casting

 

Quote:

Originally Posted by Mike Holmen

hate to ask, so how much lift your springs good for on those iron heads? I would like a spring that could handle 0.600 in lift. For $200-300 buck I would go aluminum. I'm wanting to run 9.8cr and run 87 octane gas (yeah that cheap stuff). I would like to get my truck to 350-380rwhp, as that pretty easy basic street fun truck. I live in Canada, so hey gas is really pricey here, dang carbon tax.

Mike, I am probably going to get flamed for this, but it is JMO. 350-380 rwhp out of a 360 (used in a 4wd truck) is going to be impossible, short of some form of forced induction.
A point to consider was the crate 5.9 magnum, mopar used to sell. It was 380 gross hp and used a 234? duration cam. Hardly a truck motor.
If your set on building it, considering you want compression of 9.8, I would go ahead and stroke it. As far as I can tell, Edelbrock are the only ones making magnum heads in alum. and they are $2000.00 +
As far as using LA heads on a magnum block, I believe there are oil ports that have to be machined into the block. Shaft mounted rockers, custom pushrods etc
Then, your intake will not bolt up.

To your question on springs, My understanding is .480 is max lift, and even at that, needs checked and the springs are weak. (pressure of 80 closed and 200 open)
Hughes sells a spring kit that is supposed to be a direct replacement and I think they are good to about .512 on a stock unmodified head. ($200.00+ for those) (120 closed 300 open)
The factory head can be cut, to lower the seal, and allow up to .550.
To get .600 you need custom valves, etc.
Oh, and keep in mind, with much lift, roller rockers are needed.

We know each other from another forum... That being said, I will close with this, (and craw under my fire blanket!)
You have been used to the power output and mods with LS engines.....
Be prepared to spend way more, and end up with way less power at the end of the day.
Its just the way it is.
Again, JMO

 

There are many guys getting 500 rwhp in these trucks without forced induction

 

No flaming here, and I agree on your assessment on how difficult to make power with these small block mopar's. I'm still learning myself and have not built this engine as of yet. I was thinking about going the blueprint 408/ATK 408 short block (its just cheaper, quicker this way).

found these heads
https://speedmaster79.com/Mopar-Chry...linder-Heads_3

They also sell some rocker arms (they are designed for push rod oiling)
https://speedmaster79.com/Mopar-Chry...Rocker-Arm-Set

Custom comp cams grind for 560-580 lift (with 1.6 ratio arms) and 210-220 duration at 0.050 thou.

I was planning on running a LA intake, so the bolt pattern doesn't worry me. I not a big fan of the stock dodge pcm program.

Just throwing out what I'm thinking.

 

I never did a carb swap as I hate carb, but I would think that would cause a lot of problems as the computer wouldn't energize the fuel pump without seeing everything such as TPS and such.

 

Quote:

Originally Posted by MoparFanatic21

There are many guys getting 500 rwhp in these trucks without forced induction

Show just 1 dyno sheet and just tell us the specs of 1 5.9 making 500 rwhp in a truck with no power adders.

 

I could see it in a dedicated mud truck, but, not anything that would be what I would even remotely consider 'streetable'....