What are the best heads for a hot street 383?

[170cuda]

If you run a flat top piston would'nt you loose to much compression with a 84cc eddy heads to take advanage of the heads?

[Tubbed440]

That's what I thought too.  I went from a zero decked flat top piston with closed chamber heads, to the 88cc version of the edelbrocks and picked up 3 tenths in the 1/8 mile.  I was pretty excited about that.

The combustion chamber and intake runners are far better than any "cleaned up" set of production iron heads.  Like was stated earlier, they are THE bang for the buck in a budget build for big block Mopars.

[170cuda]

Thanks Tubbed440 it's nice to see comparisons like that!!!

[Tubbed440]

Just to add to the comparison, the iron heads I was running had a port match job, a little bowl work and smoothed the runners, 2.08 intakes and 1.74 exhaust valves.  Pretty much your budget street iron head.

The Eddies come with 2.14's and 1.84's.....and a better port/combustion chamber design.

[moparnut]

I do have to add,if you are going to go with 915's,the only year for factory big valves was a 67 440hp,pretty hard to find and spendy.You could put bigger valves in earlier models,anything after 67 were 906's.I have a set at the machine shop now.

[moper]

The "smallest chambers I've ever seen in factory form on 915 heads was 82ccs. I usually mill them a little, and run the valve seat as far out as I can with o/s valves. They end up right around 78ccs after unshrouding the chamber sides. The losses due to chamber size are not quite as big a deal because the ports are quite a bit better. I still think the econo version is a set of 516s, 2.08/1.74 valves, and some bowl blending. If you get the cores right, and have the ability to blend yourself, you can save quite a bit over 915s. The exh side on 516s is not as good, but on a 383 that wont kill you. You should also run a cam with more lift and duration on the exh side. The last set of open chamber heads I had done (3 months ago) cost me $1200 after tax and parts. They needed guides, new stainless performance valves, seats and guides cut, and Crane big springs with retainers and locks, plus some special milling. I will port them myself, so add $250 if you cant do your own port work. These heads will run for 80K miles, but are heavy, open chambered, and flow slightly better than out of the box Edelbrocks, for the same money. It's your choice.

[Chryco Psycho]

I would be the guy opposed to runnign E heads after it took 4 months to sort out all the problems swapping the "bolt on E heads" on a 440 I would spend a few more $$ on a better head personally
 in my experience I have yet to see a significant gain using E heads over ported iron after 4 months fighting problems to install the E heads my friend ran the same et at the track & doesn`t make decent power on the dyno either , so is my porting that good or where is the hidden power?, especially given the extra heat loss to alum requiring approx 1 more point of compression just to compensate . this has just been my personal experience with E heads . The problems we experienced were numerous , he was running the 2255 Speed Pro piston with a 310 duration .510 lift cam the valve hit the pistons because they are not in the same place int he combustion chamber & the relief int he piston didn`t clear even with just .510 lift , next the rocker tips are nto positioned over the tip of the valves , they are toward the inside which will side load the valve & wear the guide If roller tip rockers are not used , we used lash caps to increase the surface area of the valve tip & roller rockers , the E heads Have to be ported , there were ridges left inside of the ports behind where the CNC machining stops & because this was in a 62 B body the headers are unique & prevented the installation of 3 of the spark plugs due to the angle plugs , this would not change using Indy heads Btu with the new Alum straight plug head the problem would be solved . BTW   the combustion chamber of the RPM heads is not superior to the closed chamber iron head but a EZ or SR head does have a better combustion chamber  with the kidney shaped chamber .

[Tubbed440]

Wow.  Sounds like you had other issues preventing you from having a good experience.  Bolted right onto my junk with perfect rocker geomtry using harland sharp 1.5's.  Netted a .3 decrease in 1/8th mile time.  Had to be some kind increase over a budget iron head.

I could sit here and bump heads with you guys all day long on this subject.....I could point out more things I dissagree with in the last two posts than there are nails in a 50lb box.  However, considering my nOOb status, I'll just be quiet for a while until I can build some kind of repore with you guys....

[Chryco Psycho]

fire away....... as long as it is kept civil I have no problems with disagreeing with opinions
 I do agree there are better heads than production heads , they were designed for ll passenger cars in the late 50s , 55+  years lkater there has to be some better designs , every head has issues to deal with , I am not a fan of flooding the heads with oil with external lines , Hemi heads Rule LOL 
 Maybe we should build our own CC.com heads 

[170cuda]

Do the new mopar heads have the same chamber as eddy heads?

[Chryco Psycho]

I have not seen them yet

[1 Wild R/T]

The new Mopar Performance heads are made by Edelbrock, basically they straightened the spark plugs & added a mopar logo & part #

[moper]

Same chambers, same ports, just straight plugs, the "452" cast into them, and the core plugs on the ends. I will admit, Edelbrocks are not "perfect" OOTB..I wont install them that way. But as far as valve tip alignment, I've corrected that with shims, I've never had the saddles angled so the rockers didnt sit flat on the tips. What I do find is wrong or incomplete springs on a head, exh guides too tight on most of them, intake guides ocasionally tight, seats out of round by more than .005", incorrect shims under valves, and no spring cups on the aluminum, and missing valve seals. Not every head has a problem, but in checking sets, I've never had both be "right" at the same time. I have had the same issues plus debris left in the ports on Indys in the past too. As far as the "ridges" left in the ports..That's no big deal. Stock heads have much worse left from casting and machining, and these heads are by design to replace factory heads. They are better. In material, and in design. I do think the execution is average... But that's typical for Indy, Brodix, TFS, Dart, and most aftermarket assemblies. MP's is poor, which is why they have Edelbrock make thiers now...lol. I also agree, Edelbrock's chamber is to make is smaller than factory, not to be ultra modern. The Indys have a much better chamber, and the MPs share the Edelbrock chamber design. I've yet only seen the new MPs in pictures, but teh specs and visuals are identical to Edelbrock RPMs, minus the spark plug placement.