Basic Cylinder Head Porting on 440 Source Stealth Heads

Рет қаралды 10,123

Жыл бұрын

It’s easy to ruin cylinder heads by going too far with porting. But in this video, I keep it simple and low-risk by reducing the pushrod pinch and contouring the valve guide bosses on a set of 440 Source Stealth cylinder heads. I also make a few comparisons between the Stealth heads and a factory 902 casting I had laying around.
While your die grinder is out, below is a link to a video I did on deep port matching a 440 six pack intake manifold. Link:
• How to Deep Port Match...
Also, last week I posted a video where I cc’d the combustion chambers on these heads if you're interested (link below).
• Checking combustion ch...

Пікірлер: 33

@edsmachine93 Жыл бұрын

Mopar Joe sent me over. Good luck with your new channel. I just subscribed. Take care, Ed.

@vintagevalhalla7523 Жыл бұрын

Thank you!

@jonathoncouchey7151 Жыл бұрын

Tips on any wedge head, there should be two "restriction areas in theory. 1 the pushrod pinch, 2 the throat (area just below the valve job of smallest size). Next, make the bowl lean towards cylinder center about 10 degrees. It's subtle, but helps increase swirl and flow. Also of importance . Widen the bowls to about halfway of the stock valvejob. What I mean is have the bowls be about 95-98% width of the valve directly below the valve. Taper the bowls to the throat. The throat should be easily be reached to 87-91 percent. Do not go ober 91%!!! Get a good valve job. Valve jobs are always important. Infanct it is most important. The port side wall facing the cylinder head bolt that is in between the two sandwiched bolts, needs to be blended into the bowl right by the valve guides. Widen the ssr. If you.are afraid of loosing torque. do not lower the ssr, Widen it and blend it to the port. This will dramatically increase airflow. Tips for big block mopar. Open up the pushrod pinch as far as you can.

@vintagevalhalla7523 Жыл бұрын

Thanks for your comment. You referenced the percentages for the throat which I couldn't remember. I also saw you have a good video on working the pushrod pinch and you made your own E tool! In the Dulcich article I mentioned (Part 2), he says "opening the pushrod restriction on a less developed port can, in fact, cost flow." I was assuming that the 440 source heads themselves are better than stock heads by enough that this isn't the case. 440 Source says that at .6" lift the intake flows 220 cfm at 28" water. Dulcich had tested a stock 906 casting which flowed 206 cfm at 28" water. I don't understand how getting rid of the pinch could hurt flow on a low performance head, but I am a rookie to head porting. Sometimes the more I learn the more confused I get!

@jonathoncouchey7151 Жыл бұрын

@@vintagevalhalla7523 yes, on those 440 heads. The best thing you can do is get a good 5 angle valve job. Tbh the only thing I touch on the floors is casting flash, and widening the SSR (Short side radius). The walls do not need to be widened near the floor. A good tip when massively reshaping the ports is start with the bowls first. Then bring your walls into the ports.

@bobkonradi1027 Жыл бұрын

If it works, why don't the head casting companies do it as part of the original casting process, and save us the time and labor of straightening out their cluelessness on the go-in.? You know, give us more for our money as a part of the "as-cast" process. Give us the best possible product for our hard-earned engine build dollar. For instance, I'm aware of a company that makes a cylinder head for a Brand-X (for which read GM)215-340 cid V8, and they moved the valves around to get the biggest valves, changed the castings around to provide very, very close to the best porting already in the head, raised the exhaust ports by .750 inch, and did a lot of other changes which makes the head "race ready" and at no additional cost. No problems with the short side radius, no problems with a small valve throat, with hitting water, and so forth. And it probably only cost the company an extra day or two in designing, and there was no extra charge by the mould manufacturer to do "plan B" instead of "plan A."

@Comet-hn3gm Жыл бұрын

Your advice is good, except you don't need two restrictions as you think of it. Only one will be best, and it's not really a restriction, it's a venturi at the throat of the valve job. The best port design will be a constant taper to a venturi.

@guschristensen5671 2 ай бұрын

that's the way to go I'm a big fan of David too, I run the truck flow 270's so I'll be with you, my only complaint is you saying tenth a tenth is nothing use thousands like 1.05 is one inch 50 thousands I'm impressed where your going

@JustMoparJoe Жыл бұрын

Great video! I will share it!

@frankparks4900 Жыл бұрын

Hey Joe!

@vintagevalhalla7523 Жыл бұрын

Mopar Joe! Thank you for sharing my video. I checked out your channel and it's awesome. I also couldn't help but notice a white E-body in the background... 🤘

@JustMoparJoe Жыл бұрын

@@vintagevalhalla7523 haha! Yes sir. That’s my 70 challenger, VP clone with Gen 3 hemi swap and 4 speed. May have to go to a 440 someday!

@andrewfrisard8960 Жыл бұрын

Thanks Mopar Joe, I jump on the wagon!!

@slowg8701 Жыл бұрын

Good info Glad ya went over this I've got a set of these heads I need to clean up also.

@phillipsrundripbubblecompa9232 Жыл бұрын

Man years ago I worked for Trick Racing engines and ported cast iron heads.. long long day...

@vintagevalhalla7523 Жыл бұрын

I bet! Aluminum comes off like butter, but its too bad those gnarly shards find their way into everything. I was picking sharp pieces of aluminum out of my shoes for a week.

@terryboothe2309 Жыл бұрын

Great video . I’m learning a lot

@vintagevalhalla7523 Жыл бұрын

Thanks! I'm glad it was helpful.

@1967davethewave Жыл бұрын

That was a good video. Doing the measuring and having the proper research is so important so as not to actually make them flow worse. I have a set of 440 Source heads on my Roadrunner with a mild 440. I did almost the exact same port work except I blended the short side radius some as it is pretty sharp But bowl work is pretty delicate so I didn't touch them other than that. Too bad you don't own your own flow bench, I don't either. It would be really fun and also a better tool when porting to see the actual numbers. But I know that doing the measuring and being careful like you did will definitely make them flow better. One complaint about the 440 Source heads, I wish they would retool them with better combustion chambers. But they are still great heads at an incredible price.

@vintagevalhalla7523 Жыл бұрын

Thanks for the comment, Dave. I'll be the first to admit I am a novice with this stuff, and feedback from people with experience is greatly appreciated. Like you, I was reluctant to touch the bowls because I know the 440 source casting's bowls are better than stock already, and I've heard that the throat diameter needs to be a certain percentage smaller than the seat diameter. I just didn't feel comfortable getting into that, especially on someone else's heads! So, I just wanted to try and keep what I was doing somewhat idiot proof and low-risk for breaking through. Maybe I'll get more ambitious on those iron 902's one of these days.

@bobkonradi1027 Жыл бұрын

If your head manufacturer had done the best bowl processing at its design and casting process, they could revise the water flow in the head accordingly and there'd be no worry about grinding into a water flow channel. Doing things like this at the manufacturing level is cheap and easy, and would save us buyers a ton of money and time.

@BilgePump Жыл бұрын

Excellent work of course, i wondering how much that equates to on the dyno.

@vintagevalhalla7523 Жыл бұрын

Thank you! I would really like to know that, also. If I ever get the opportunity to have them on a flow bench, or do a dyno comparison, I will definitely provide an update. Thanks for feedback!

@patnaty Жыл бұрын

Tanks good video

@bobkonradi1027 Жыл бұрын

I got a question about cylinder heads and the porting of cylinder heads. Why are we "required" or even just "suggested" to buy a set of heads (up to $3000 or more) and then port the heads to clean them up and get the best flow performance out of them. ? I never read about somebody buying a set of heads and then just bolting them down to a block. My thought: why don't the cylinder head companies just take a head, cast it (as cast) then we have to port it out to the "N"th degree, but instead the mfgr. just revises their port moulds to reflect the best flow.? Lets say I buy a set of MoPar 440 heads, as this article talks about. The manufacturer gets the heads, ports them out for best flow, and then recast the intake and exhaust passageways to reflect the porting. I just don't see any value in paying up to $3000 or more for heads, then pay an additional $2000 for porting. That's costing me $5000 for a $3000 set of heads. At the foundry and basic design levels they could give me the equivalent of a $5000 set of heads for $3000, which would be a reasonable purchase price. Most all engine builds, they talk about they take the heads out of the box, then port them for the best flow, and then toss the $2000 (+) port job around like it was an automatic thing to do as part of the purchase price.

@vintagevalhalla7523 Жыл бұрын

You raise a good point and I don't know enough about the manufacturing process to intelligently answer. My GUESS is that the more aggressive the casting (ie the thinner the wall thickness to internal passages), the higher the likelihood that a variation during manufacturing results in break-through, costing them quality control and money. Another factor here might be that bigger is not always better with port size if you have a mildly built street engine. If 440 Source changed their casting for maximum flow, maybe they would be too aggressive for a stock replacement part? It is possible for ports to be too large. As quoted in the video, one of Vizard's golden rules was to keep port velocities up... For me, I'm interested in learning how to make more power on my own just by putting in the work. Having said that, there's no doubt in my mind that, at my skill level, I could never port a 440 Source Stealth head to outperform a Trick Flow head, for example. If you don't have the time, just aren't interested in the process, or don't have the appropriate air compressor, or work space to port, I think buying the best as-cast head you can find is a great way to go. Someday I'd like to try out some Trick Flow heads, and with a head like that, I would run them as-is... but that's just me.

@Comet-hn3gm Жыл бұрын

@@vintagevalhalla7523 You are correct on one size doesn't fit all. Your desire to learn will take you far. David V-I-sard is good to listen to. Please look him up on KZfaq and subscribe. It's worth your time. Also see Eric Wingarter for porting heads.

@vintagevalhalla7523 Жыл бұрын

I’ll do that! Thanks for the recommendation.

@flinch622 10 ай бұрын

Burrs... Aluminum clogging can be too much surface speed. I use [1/4" collet] double cut nearly always, and as long as speeds stay controlled [plus I put a litttle Break Free on them], I have few poblems. But... I use a dc drive motor with flex shaft, not an air tool - I get speed control over a much wider range. Bonus? I avoid cartridge rolls half the time, as I do not suffer the "chop" that single burrs can leave. Singles have their place when massive amounts of material must be removed.... there's just a need for refinement of surface afterwards.

@vintagevalhalla7523 10 ай бұрын

Thanks for the suggestion!