edelbrock heads & M.P. cam

[goose69]

I am curious if anyone out there has ran the edelbrock big block heads with the mopar performance 292dur 509lift cam? I've already purchaced these items after the techs at edelbrock said theye would work well together. I had my machinist check them out and he suggests either the factory suggested M.P. springs or comperable ones. I wrote an e-mail to edelbrock explianing my concern and they shipped my heads back to the factory for re-inspection and check the springs. They returned them as received and said the springs will work fine. Now I'm stuck in the middle and want to know if anyone out there has ran this combo yet and how it is doing. I will also be using a 150hp nitrus kit on this in a '69 road runner with a .040 over 383 and forged pistons. thanks for any input.

[gsmopar]

I'd trust the EB guys and slap the engine together!

[Duster Don]

A friend of mine just rebuilt his 440 and used the same heads and cam with cranes gold rockers and it works great and the cam has a nice lump to it. I've read on here that some guys think you should have the valves checked to make sure they seat properly and do a gasket match on the heads and intake, might be a good idea and also some cheap HP. You just need the right lenght push rods and bolt them and hang on . Just my 2 cents. Good luck!

[ehostler]

The springs on the EB heads are good for up to a .600 lift cam. You're still under that, so go for it.

[rumblefish360]

Love it in my small block.

[dirty dan]

I was woundering what size valves are you useing?
I would assume they are at least 2.140 intake and 1.81
exhaust.
If this is so .
you may or may not be aware of the need to notch the top of the bore to make room for the valves.
You probably new that .but then again mybe you didn`t.
Either way I hope it helps.

[ehostler]

Good catch Dan. I forgot all about that.

[goose69]

Thanks for all the replies. I believe I'm going to bolt this combo together and see how it runs. Edelbrock has guaranteed this to work ,so I sopose I'll try it. If it doesn't work out then I guess I'll have to back to Edelbrock. They also said I wouldn't have to any modifications to the cyl. walls ,that these heads were a direct bolt on. Has anyone else had problems with the valves hitting the cyl. walls? By the way to answer the one gentleman's question... yes they are 214,181 valve heads.
By the way for you guys that have already ran this combo ,what carburation has worked out well for it. Keep in mind that this motor will be seeing 7000rpm shifts with 150hp nitrus. I have a wicked 727 built for this , a 3000rpm stall,and 391 gears.

[ehostler]

Don't run those heads on a 383, unless you go to a large overbore (I think that it is .090 over) or cut valve reliefs into the tops of the cylinder bore. The 2.14/1.81 combination is wider than your cylinder bore. The valves WILL hit the deck. When that happens, things (valves & pushrods) are going to bend and break. It won't be pretty and the damage won't be isolated to the heads.

EB only answered your concerns about the springs. They didn't say anything about bore diameter and the fact that the edges of the valves will hit the top of the deck, insted of entering the cylinder bore.

Talk to a good MOPAR machine shop (like Hughes or Dvorak), if you don't believe me.

[dirty dan]

Goose
E Hostler is right on the money.
From what you said I get the impresstion you asked edlbrook
if they would fit .
And as they are probably asked that 100 times a day their
standerd answer would be yes they will fit,and they will.
As they come from the edlbrook factory they will bolt right on.
however the engine will not turn over by hand.
and should you force it with the starter you will have a nice asortment of paper weights and ash trays.
Even with out the E-heads if you use the factory heads with
2.140 and 1.81 valves you would have the same problem.
So you see it`s not just a bolt on swap for the 383.
I am sure you and thousands of other guys wish it were.
But wishing doesn`t make it so.
But I wish it did.
Hang in there your on the right track.
I would say either a 750 or an800 cfm should do the job
for your engine

[goose69]

Well once again thanks for the info. I did approach edelbrock with the info that my 383 is .040 over ,but then again they told me a lot of other things that turned out not to be true. Looks as if the block and heads will be back in the machine shop for a little more money out of my pocket that uncle sam didn't get ahold of. Thanks for the catch though, it would have been overlooked!
As for the carburation issue I have quite a few units here at the shop and was looking at the holley 750dp and maybe even using one of those new center sections through I think it was barry grant.
Well anyhow thanks again.