well, I'm done. The whole shebang...

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Ironmike

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All done and ready for the dyno. The dyno for me is more of a chance to check for leaks, seat the rings, and get close on the AFR. The numbers are nice, but we all know ET speaks the truth.

Anyhow, I thought I'd throw a couple pics up(headers are on for the pics only)
By the way, those TTI's have been run for 6 seasons. No recoating, No "dinging" to fit. God forbid. As you can see they DO hold up well with a little care.

For those who might be interested, or don't already know....here's the build:

73 360 bored to 4.060. Sonic checked very very good. Deck surface was way off. Now perfect.
Icon forged, stepped dish pistons, .008 out of the hole, for 10.7 to 1 and a .031 quench
CAST steel Scat crank, Scat rods, reconditioned.

Had the whole rotating assembly balanced since the pistons are new to the crank

IMM/Indy CNC ported heads. Locally touched up and flowed. Have the sheet right in front of me. They flowed: 281@ 500 290@ 550 296@ 600 293@ 650
My guy said velocity on the short turn was pretty good, but not great....whatever all that means.

Lunat VooDoo cam. solid roller with MRL lifters(thank you Mike!) .640/.640 lift with my Hughes 1.6 rockers
duration at .050 255 intake, 263 exhaust
110 lobe separation, installed at 104.5.

Ported Super Victor intake with a Holley HP 950, 76 jets up front with a power valve, 82 in the rear...no PV. Fed by Carters strip pump.

Gotta get some new wires.....and of course at's all lit by MSD.

So what are my hopes for the dyno???
That it breaks in nicely, with no leaks and no smoke. And NO catastrophic failure!
 

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Looks great and a powerful combination. What do you think it will put out? 575-600? Keep us posted.
 
very close to my build hope you make some hp would make me feel better as I was concerned about going with the iron indy heads
 
IMM/Indy CNC ported heads. Locally touched up and flowed. Have the sheet right in front of me. They flowed: 281@ 500 290@ 550 296@ 600 293@ 650
My guy said velocity on the short turn was pretty good, but not great....whatever all that means.
Click to expand...
I'd like to see the lower lift flow numbers if you don't mind. There close to fully ported W2's.
What your guy is telling you is the velocity, or speed of the air flow in his opinion could be better. Or quicker. The head porter could pick up the numbers in all probability but in the same respect, loose on high lift flow. When fully porting a head, (Or intake, or carb...) there is a trade off that happens. Considering your build, I'd worry not...in the least...your gonna rock!
 
Just curious as to the reasoning, but why a power valve in the front and not the rear of the carb?
 
With stock stroke? I'd be really surprised if you don't make at least 550 horse, somewhere in the 6500+ area. I've been looking at doing about the same idea with my 340 (either w9 or SB victor heads, 11.5:1, big roller cam etc). But keeping the stroke stock (so I can still call it a "340"). And I ballpark 550-600 horse depending on final setup. Your's should have more torque.

So I'm very curious what you end up making with this setup.
 
rumblefish360 said:
I'd like to see the lower lift flow numbers if you don't mind. There close to fully ported W2's.
What your guy is telling you is the velocity, or speed of the air flow in his opinion could be better. Or quicker. The head porter could pick up the numbers in all probability but in the same respect, loose on high lift flow. When fully porting a head, (Or intake, or carb...) there is a trade off that happens. Considering your build, I'd worry not...in the least...your gonna rock!
Click to expand...

I guess you are right, sir. My guy did pick velocity up a bit by some "hand work", but as you can see flow started to drop off at .650 lift, so he stopped where he was. He seemed fairly happy with it at that point. I'm not too bright when it comes to flow vs velocity, etc. Got to read up some day....

Lower numbers were 227@.350 248@.400 264@.450

All that friggin typing and I forgot to mention it's a 4 inch stroke! 414 cubes.

I'm trying the carb set-up that way to try and keep it from running a big rich hit when I stomp it. Might just go back to 76's in all 4 corners with 2, 4.5 powervalves.

Should get on the dyno next week.....I hope. The guy treats me pretty good and only charges 250 bucks for a session. That's me helping him put it on the dyno and hook everything up. Still it's really really cheap. I think.

He did all the machining and we have a pretty good rapport. Don't think everyone pays that price but really don't know. All I know is he is one helluva machinist and really cares about his work. Glad to have him on my side.

Oh, yeah. I'm curious what it's going to make, too. Not even gonna try and guess. I do know that Lunati told me I will be shocked at the torque that cam can deliver. I guess we'll see.

I'll let you all know, good or bad! Thanks guys!
 
Stroker!

Well with some basic calculations I come up with 8.23 dynamic compression ratio (I could be wrong on that the). Putting you right on the edge (8.5 on aluminum heads with 91/92) of street gas. So that's good. Your quench sounds excellent. Head flow numbers look great. Like others mentioned, you're in W head territory. That cam has great lift with the 1.6 rockers. You'll make power passed 7500 I'd bet. Maybe get to 8000. You're going to lose some bottom end and torque with that cam and some street-ability. But that thing is going to make power.

My best guess for power?
I'd like to see 630 horse at 7300
595 lbft starting around 4200 and flat till 6500

I may be over estimating there. I can do that. But I really think you'll break 600 horse with that kinda lift. A lot of other 414 setups fall just shy of 600 horse, but also don't or just barely make .600 lift. I think that's whats gunna push this motor over.

But what do I know, I'm a shady tree mechanic type lol.
 
Well yikes! Don't plan on spinning it more than 7000. Stock block. Honestly, I'll be happy to see 550 at 6500.

nm9......thank you soo much! You sure didn't forget the crap summer I had last year. Kind words mean a lot.

Jeez, called dyno guy this morn, he says really really busy, but just come out Wednesday morning with donuts. I was expecting a little wait....now the nerves begin.
 
If you're keeping it under 7000 then I would definitely say under 600 horse. If you're running under 7k rpm you COULD even step down one cam, gain more on the bottom end, losing anything over 7000. You'd just have to watch your dynamic compression. Make sure it doesn't jump up. OH and if you're worried about stock block, you can always get a girdle. They help block walk a lot.

My mind keeps telling me I'm high on the numbers. That a lot of other 414's out there don't make that. But damnit if I don't think those heads can make it. They sound awesome.

You'll have to let me know what you think of the hughest 1.6 rockers. I am really looking at them for whenever I go for new heads and such.
 
I'm going to guess 560-585 range. Those step headers might hold it back slightly, maybe not. Your gross lift is just a bit less than mine with 1.6 rockers. Your flow numbers are close to mine, too.

What fuel pump are you dynoing with, what pump on the car?

I was enlightened to ditch the mechanical and go with a good electric pump, and in the car, I can feel the difference from 6500-7000 range.

I take it you have some bigger jets for the secondaries?
 
I have a similar 408 stroker IMM just built for me and I got 523 hp @ 6000 rpm and 522 ft lbs of torque @ 4500 rpm. Granted, I have a match-ported LD4B, EQ heads, a Holley 850, and probably a different cam. I'd guess with your changes, you'd have closer to about 580 hp @ 6500 rpm and 560 ft lbs of torque @ 5000 rpm.
 
I'd say 540hp, I do like the look of those heads instead of the big aluminum chunk!!
 
If you intended to one day explore a cam that goes to 650 lift or more, I wouldn't worry a fraction of a bit. The flow is still very high at that point. And not for nothin, dats a whole latta lift.

Someone mentioned power with the stepped headers. The problem is cassis figment with a header tube size that would allow excellent / max output. IDK what size the pictures are or how big TTI will do standard head headers.
 
TTI steps are 1-5/8 to 1-3/4. They do offer 1-7/8 Race headers(3.5" collector vs 3"). Good luck making them fit, it is real, real tight.
 
Running the Carter strip pump. Ran it last year....Pretty consistent 6.5 psi, with plenty of pounds per hour.

Combustion chambers are 60.5cc.

Gonna know some answers In..........around 8 or 9 hours. I wasn't at all nervous before dyno day last year. Don't know why I'm all "antsy" tonite. Just can't handle another friggin failure I guess.

I'm gonna predict 547hp at 6600..........stay tuned.
 
I'll be here waiting for the numbers. Now I'm starting to get antsy.
 
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