Eddy heads on 416 stroker question
- Thread starter northeastmopar
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71swing
Well-Known Member
Sorry apparently the link doesn't take you right to it. You'll have to use the categories on the left to get to your kit where it list the ratio. But it's states the same what the guys above have said. 10.1ish
mopardude318
Well-Known Member
I might have missed what rockers you have or haven't bought yet, but I recommend, and use the Hughes Engines rockers. they are a very nice rocker and perform flawlessly on my hot street 318, which is also equipped with RHS heads prepped by Brian @ IMM. beehive springs the whole shebang... I rev the hell out of it. 
autoxcuda
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I bought that same reciprocating Scat kit from Brian at IMM.
I used the "63cc" Edelbrock head.
With the 1008 Fel Pro gasket i'm at around 9.8 to 1 compresion measured. I could give it to you to the hundreth of a point but I don't have my notes handy.
IIRC, I have like .020-.025 quench.
I run the car on cheap Arco 91 octane california spec gas. Pings tiny bit with 34 degrees total advance. Have it set at 32. My Comp 274-S cam is pretty close to your Lunati
60779 heads measured at 65 cc +/- 1 (putting old unclaimed show trophies to good use)
340sFastback
Well-Known Member
What he said. They are a little bigger then what Edelbrock claims.
MRL Performance
Well-Known Member
Yup the 63cc is 65cc and the 65cc is 67cc
airwoofer
Drivetrain limit explorer
That is pretty good flow or a generous bench. MRL only got 280 out of mine.
To the OP, I have a spare set of gold colored rockers on shafts that you can buy for $50 shipped. 2 of the rockers look like they were run with the adjustments loose as it appears that the pushrods ate into the bottom of the rockers where the adjuster is. Shouldn't hurt anything. You will need to buy a hold down kit like the one Hughes sells.
Also, the best geometry article I have seen yet is:
[ame]http://www.hughesengines.com/Upload/productInstructions/LengthCheckerDec2012.pdf[/ame]
Thanks for your offer on the rockers. I already have a set on the way. Already got the rerturn authorization on the open chamber heads and I will swap them out for the closed chamber heads. This site has been a huge help with these items. I am sure my machine shop who is actually going to set this all up will be double checking everything I give him, but I have always enjoyed trying to have a better understanding of the race/horsepower/torque stuff that I really am a little in the dark on.
moper
Well-Known Member
Sounds like you're making the right choices... Back on the valve springs - pressures are much more important than lift to see if a certain spring will work. The dual springs will drop on the RPM heads - so it's no sweat for the machine shop.
Mad Dart
Nothing to see Here!
Brian at IMM did the heads I have on my parts shelf "Edelbrocks". If anything he is conservative. I have tried to get him to tell me what I "Want" to hear many times and he would not do it. Super Straight shooter when it comes to the numbers. I have built several engines with his assistance.
SRT_DSTRHOLC
Well-Known Member
Im with mad dart...My RHS got 280-290 and my friends got 290 out of them with just a basic port not fully ported
airwoofer
Drivetrain limit explorer
The heads I will be using next were bot from MRL and had the springs I bought for the cam installed. I basically let Mike work out what I needed to copy a build he posted here including the cam and roller lifters (a 418 which also has the 20 cc dish pistons I have in the 416). Bot Hughes 1.6 rockers and sent them up to him to clearance. This worked out pretty good. Only thing I might have done different is pay to also have the rockers put on the shafts and the shafts installed on the complete heads, ready to install.
The OP got his money's worth of free advice from this forum on the chambers. Good catch.
The OP got his money's worth of free advice from this forum on the chambers. Good catch.
Yes Indeed, To be honest, the way Edelbrock has the two small block RPM heads listed, it was kind of confusing for me. The one I ordered was labeled 340, which is correct I guess but I now understand that the other head (closed chamber) will help me regarding the Quench and the stroker build, which was mentioned here in this topic. Glad I asked the question. I do understand the jargon when it is explained, but I am far from a race performance expert. Mike at MRL helped me on this also. I would have loved to have him do this for me, but we are toooo far apart and I like to be nosey as a build progresses. I figure that way, I will learn more and someday be able to help someone else down the road.
airwoofer
Drivetrain limit explorer
I live in Alabama and have never met Mike besides on the phone. Just a little shipping, no big deal. I think I may have worn him out with questions though. The engineer in me, I suppose.
Until I looked it up yesterday I did not know the difference between the open and closed combustion chamber configurations either.
Next I will be taking the iron heads off my 340 and looking to put the ported eddy's I had on the stroker on to it. Also change the cam to the PP 508 that was in the stroker unless the 340 already has one. Spare engine...
Until I looked it up yesterday I did not know the difference between the open and closed combustion chamber configurations either.
Next I will be taking the iron heads off my 340 and looking to put the ported eddy's I had on the stroker on to it. Also change the cam to the PP 508 that was in the stroker unless the 340 already has one. Spare engine...
MRL Performance
Well-Known Member
Gee thanks for the shout out there, "only got". Remember your heads are NOT fully ported, Stage 2 ported. Stage 3 is considered full porting and costs a lot more. You will not be disappointed with the way your stroker runs when you get it all done. ;)
airwoofer
Drivetrain limit explorer
Hey Mike, 300 > 280...so ONLY is the score. Now Bad Dart's d*ck is bigger than mine and I am inadequate in the eyes of the Mopar gawds. Doubt my dawgs will even like me anymore... shame is all mine for being a tightwad.
I am not disappointed BTW. Can't wait to get it running in the Demon and take it down the track. Should be more fun that the 416 was before with the 508 cam, and it was a blast. Hoping to get well over 100 MPH at the 1/8th. Was 98+ before in the fish. Tranny guys already bitching about me wanting a 904 built with automatic VB for the motor.
I am not disappointed BTW. Can't wait to get it running in the Demon and take it down the track. Should be more fun that the 416 was before with the 508 cam, and it was a blast. Hoping to get well over 100 MPH at the 1/8th. Was 98+ before in the fish. Tranny guys already bitching about me wanting a 904 built with automatic VB for the motor.
Brian Hafliger
Well-Known Member
Yes, it really doesn't matter what the head flows if the engine can ony access 250cfm! Too many guys want fully ported (300+cfm) heads because they think the engine will use that extra flow...when most times it won't.
That's why I don't like the current offerings being done on cnc's. Your stuck with the larges highest flowing port whether you need it or not!
Mad Dart
Nothing to see Here!
Go big or go home! .650+ net lift at the valve will cure that most of the time right?? Haaaa
MRL Performance
Well-Known Member
Use it if you NEED it. I have made close to 700hp with cnc ported RPM heads
Mo-Par
Well-Known Member
Good thread. I am thinking of a similar (360 strocker) 410 build right now. 4' Scat crank,Scat I beam rods,Icon dished pistons (21 cc),236/242@50 .513/.533 lift Voo Doo cam,closed chamber Eddy rpm heads,Huges 1.6 roller rockers,RPM Air Gap and Eddy 800 cfm AVS. This has been very helpful.
airwoofer
Drivetrain limit explorer
Mo-Par, why so little duration? That will be almost 10-1 and you could probably run 255* / 260* like the 60434 voodoo.
Hey, I plan on runnubg the 60404 voodoo cam in my 340 stroker. Mike from MRL suggested it to me as a nice cruising cam with lots of low and midrange torque. Although I was originally telling him I would be using 2.02 stock iron heads. But now with the closed chambered eddies, do you think I should rethink the cam? It is an automatic 727 with 355 gears and I was thinking of a TC with about 2400 RPM stall, so I will not be slipping when I am cruising on the highway at 70 MPH?
Thanks
airwoofer
Drivetrain limit explorer
You should go with Mike's recommendation. I have never ran a 60434 solid but am in the process of putting one in to "copy" the 418 Mike posted here last summer. Less duration should make the motor more street friendly. I was looking for more so the streets around here would understand that I am no friend of theirs. Well, unless you consider a coat of rubber to help build up the surface and keep water off being friendly.
MRL Performance
Well-Known Member
Its still a good choice. I have built a few strokers with that cam, they all made 520tq+. Most came in the 475hp range, real nice street engine.
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