Aluminum cylinder heads

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71Scamper

71Scamper

Mopar runs thru my veins!
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Hey Fabo, it's been a couple/ three years since I have been on here. Between having kids and buying a house, I haven't had the time or money to mess around with my Scamp. Im finally getting back to it and I've run into an issue with the stock X heads. While tuning in the fuel injection I had a bad backfire. The backfire blew out a hole in the #1 intake runner at the pushrod tube. I guess the machinist got a little overzealous when opening up the pushrod pinch. I've decided to upgrade to aluminum heads. I know this question has been asked before and I'm beating a dead horse but I'm looking for those that have been running speed master (edelbrock knock offs) for a while now. What's been your experience with them? I know MRL use to take the speed master heads and fix the minor imperfections to make them as good or even better than edelbrock heads. Too bad he's not building engines anymore. Thanks!
 
ir3333 said:
Just curious, what are your camshaft specs?
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Im running a Lunati voodoo retrofit roller cam #20200712. It is in a 340 bored .030 over, 9.7:1 static compression, smith brothers pushrods, and Hughes roller tip rockers.
 
So im going edelbrock for heads. They offer 2 heads for use with hydraulic roller cam, one's specifically for the 340. My question is, which head should I go with? I have the old trw pistons that just barely stick out the hole. Should I go for #60775 and run a thicker head gasket or go with #60175?
 
If it were me I would go with the closed chamber and thicker head gasket, just in case you end up rebuilding your motor or put those heads on another short block you can zero deck your pistons. Let us know how it runs after the change, I have the same type of pistons in my 340 as you do and was looking at the trick flow heads, a little more $ but are cnc ported and ready to run out of the box with good components.
 
TF’s Flow way more to boot.

I have the heads you enquired about by Pro Maxx. So far, so good. I believe they weigh more than my Edelbrock heads. Pro Maxx CNC’d them from a bare state and installed all the hardware.

These can work out cheaper than the Trick Flows easy enough but do lack against them. IMO, there better than the Edelbrock heads and out flow them at a cost of only a few hundred more. A cost difference you can not match when you consider the machinists cost to equal or surpass the head.

Compare flow rates & curves of these and the other heads and decide what’s right for you.
Here is a link;
Shocker 185 Mopar CNC (Sold in Pairs) - PROMAXX Performance Products
 
For optimum use of aluminum heads, the Scr needs to be brought up.
The aluminum heads remove a lot more heat from the chambers, than iron, and that means power.It's been written that when swapping, the Scr needs to be raised at least a half a point,just to break even; and that puts you at 10.2. But IMO your 9.7 was already .3 low, so then you are at 10.5 for 87. But if you were willing to run 91, then you could be 11.1 minimum. But I think the half-point estimation is wrong; I think we need a full point, so that takes us to 11.6 for 91, see below;
Some of us run up to 185psi cylinder pressure on 87gas and a couple of guys are at 200psi on 91.
In a streeter, if you reassemble her at 9.7Scr, you will lose low-rpm performance big-time, and be disappointed.
That Lunati is a 231/239/110 @.050 retro-roller,and advertised is 282/290..
With iron heads 9.7 Scr was IMO, already on the low side.
With aluminum, the Wallace Calculator is predicting Scrs of about 11.0 for 178psi(87gas), 11.3 for 184psi(89gas), 11.6 for 190psi(91gas); pick your poison.
I'm not saying that you absolutely have to bring the Scr up, period, because a 2800TC or better, will solve the torque-loss off the line. But the midrange will also be soft at 9.7, and the TC cannot do anything about that.
What I am saying is that with those pop-up pistons you have a golden opportunity to make a real bruiser of an engine. All you gotta do is machine the tops to fit the closed chamber heads and get the Q down in the range of .030(+/-.005), and finalize the Scr for the gas you are willing to run.
At these pressures I recommend the FelPro .039s
Jus trying to help.
I have a similar cam in my 367 namely 230/237/110 and 276/286 @.008 advertised, but she's a FTH. She runs 10.95Scr and burns 87E10 @ over 177psi with full timing 32/34 by 3400. And at 207*F minimum coolant temp. She makes plenty of torque for a clutch and a 10.97 starter gear, and pulls hard to 6000, and I take her to 7000 as often as I can.
My Scr is less than yours,because my advertised is a full size smaller than yours, if you were wondering.
 
Splitting hairs AJ,splitting hairs.

Really? .3 on the ratio and your dog in him.

LMAO
 
Agree on the closed chambers vs the ones with the .100 detonation dish-
how far out of the hole are you really
interested in what you find in your search
Truck/ industrial and Marine gaskets are thicker and there are also compression lowering shims-or Cometic
which is what I would do instead of the recessed chamber
as far as AJ goes he's on the right track as the head cc's and amount of pop up are still open questions
YR will disagree on the AL vs Iron as he is able to run Iron at more compression than I ever could (with the same gas)
OP post up your details and head flows of your candidates
Note that a good cam grinder will use lower than .100 to determine when to start to open your intake- the overlap/ piston demand theory
headers also play into this
long rod mopars do not tolerate overlap the way short rod chevies do
 
LMAO, yea I know. Loads of dribble to sort through before you get half an answer. I complain often. Just me though. I guess everybody likes to read through a bunch of bullshit first on how he over revs his engine needlessly with his tiny cam and says “I know, I don’t care, it sounds cool at 7K even though it’s done with power at 5500.” That is some amazing machine he has getting 32 mpg’s.

flyfish said:
AJ has been throwing walls of text at people since the beginning of time....
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getting 32 is not hard;expensive maybe;but not hard.
You only need one thing, namely; the will to get it done.
I wasn't even targeting 32, it just fell in my lap.
If you don't find my posts interesting or useful, "drive thru"
It's my engine, I can do with it what I want .
and it went 93 in the Eighth@3467 pounds@930 ft elevation, with 3.55s......sitting on 7000;
and not just once or twice, but the whole way.
and it currently has over 100,000 on the clock.
So, you build yours how you want to, and treat it how you want to, and I'll do what I want to.
And I still won't demean you for doing what you want to.
Hey; don't you have about the same engine? Load it up to 3467 pounds and see how you do.
Maybe I'll short shift mine next time....... if there is a next time.

My dog runs 20/25mph, not because I make him, but because he likes to, so I let him;he getschit done. My engine goes 7000 because it's happy there, so I let her. She gets it done too.
 
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AJ/FormS said:
What? you can't even remember what cam you told me you had?
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So, what you really said above is, “I’m not telling you what I’m running.”

What 1 of 4 cars would you like me to disclose cam information on?
 
Bring that sucker down to Keystone in Pa with some altitude and humidity. At 7000 rpm that sucker will choke like and old man smoking a Camel cigarette.
 
pittsburghracer said:
Bring that sucker down to Keystone in Pa with some altitude and humidity. At 7000 rpm that sucker will choke like and old man smoking a Camel cigarette.
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Only real men smoke Camels without filters. And my grandmother. Smoked them damned things until she died. Nasty business.
 
yellow rose said:
Only real men smoke Camels without filters. And my grandmother. Smoked them damned things until she died. Nasty business.
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That's some hardcore stuff right there. Being a nonsmoker i would get HIGH on one of those suckers. LOL.
 
pittsburghracer said:
That's some hardcore stuff right there. Being a nonsmoker i would get HIGH on one of those suckers. LOL.
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nah, you would turn green , get dizzy headed and then puke. just like I did when I smoked one of dad's lucky strikes when I was a kid.
I will spare my experience with days work chew plug. lol
 
fishmens67 said:
nah, you would turn green , get dizzy headed and then puke. just like I did when I smoked one of dad's lucky strikes when I was a kid.
I will spare my experience with days work chew plug. lol
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Yep. I chewed once. Only once. I was working at a place called Kings Table. A buffet slop hole. I was 14. Back there banging out pots and pans. The two guys working with me went on break so I went with them. They had some Kodiak. They said give it a try. It's the only bear you'll ever pinch.


They left out the part about NOT swallowing the juice. Nasty, nasty business.

After about a half hour, I was on all fours, blowing chunks like no tomorrow. And they say I was green.

I'm still friends with those bastards after all these years. And no, I didn't pinch the bear. The bear kicked my *** but good.
 
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AJ/FormS said:
getting 32 is not hard;expensive maybe;but not hard.
You only need one thing, namely; the will to get it done.
I wasn't even targeting 32, it just fell in my lap.
If you don't find my posts interesting or useful, "drive thru"
It's my engine, I can do with it what I want .
and it went 93 in the Eighth@3467 pounds@930 ft elevation, with 3.55s......sitting on 7000;
and not just once or twice, but the whole way.
and it currently has over 100,000 on the clock.
So, you build yours how you want to, and treat it how you want to, and I'll do what I want to.
And I still won't demean you for doing what you want to.
Hey; don't you have about the same engine? Load it up to 3467 pounds and see how you do.
Maybe I'll short shift mine next time....... if there is a next time.

My dog runs 20/25mph, not because I make him, but because he likes to, so I let him;he getschit done. My engine goes 7000 because it's happy there, so I let her. She gets it done too.
Click to expand...

Hey, all he is saying is, you talk too much to get a point across .
Much like my old lady ! lol
 
When I was stationed out at the Oasis the Arabs were eating their dates but there were no women for us I'd walk a mile for a camel.
Then I found you were supposed to use them to ride into the Casbah
 
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