Heads...again

[RustyRatRod]

Plus no one seems to believe...........

My buddy Rodney is a prime example of this part. He's always sayin stuff like "that guy's flowbench is happy" and stuff like that. I don't know. It's like there's no way in hell he's gonna believe that yall might be turning up new ways of doing things and getting a little more than other folks. I like to be the optomist. I think yall are on to somethin. Rear wheel dyno results don't lie. Dyno competition results don't lie. Some people have to be beat upside the head and even then they don't believe it.

 

[4eyedblonde]

What heads are costing $2500?

Up here we get raped. Everything seems less costly in the states. The Performer RPM's are 890.00 ea. Porting is another 300-400 add the tax = 2500..ish

 

[RustyRatRod]

If the 300-400 port job is a good job, you're more than getting the difference in purchase price of the heads back.

 

[4eyedblonde]

I'm not familiar with a 216 head but the 906 head is great on the street with even just a pocket port job. Personally I'd just grab the 906's and run. Why do you need high flowing heads for a mild street car that sees redline maybe once in a blue moon? You live at 3000 RPM on the street so what is 300 peak CFM going to do for that? I bet nothing that you will notice.

Agreed, I went with the iron heads. As long as this guy can get a wad of torque out of them, I'm good. For the money, it's all I need

 

[Meep-Meep]

Maybe it's interesting to see the intake port in my Ducati 916SPS? Talking about straight shot...or deep throat...and yes, no valve springs...

This is about what you see on a 427 high riser head - except the multiple valves and round ports. The goal is to get rid of that turn into the pocket. Now let's put the Desmodromic valve gear on a 451 and see how far she'll go!

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Well said Meepamous. But you know, it's my opinion that power is left on the table with every build. Look at it like this. Say you built an all out N/A 750 plus HP "street" motor. You couldda put nitrous on it. You couldda put a blower or turbo(s) on it. So really, power is left on the table no matter what you do.

Jim has said all along that ANY of the iron big block heads will support 600 HP.......and I think the flow numbers from the different castings support that. In the end, since they ain't makin anymore big block iron heads I have to ask "what difference does it make?" Like you I don't really give much of a damn about power left on the table either. I say just build what you have and have fun with it.

Hell, races were won and records were broken with every single big block iron casting before the 915 and 906. They WILL perform. It's been proven. Jim has gotten close to 800 HP from 906 iron heads.....maybe he has gotten 800, I don't know. Is it fair to say those who use 906s at a lesser power level are "wasting" 906 heads? I don't think so. But if the 906s can see 800 or close to it, that means the 516s and 452s can see similar. I'm just not that into splittin hairs. I say pick a head and run the sumbitch.

Absolutely right! And some people call the old MoPar cams out dated but they all seemed to produce 400 - 500 or more HP so what's the problem? Landy, Sox and Martin all seemed to win races with what we now call out dated junk, albeit well prepared out dated junk. My heaps ran well with iron stuff and I'm sure yours did too. So if someone wants to grab a set of iron heads and do some quick porting and quality machine work then have at it. The problem is getting tied up in trying to push them too far beyond the design limit, at which point it pays to get aftermarket heads.