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@@vrm86gt The exhaust did a but better after hand blending it, results shown on our Vigilante Performance Instagram page. $3400 and yes, you need special/expensive rockers.

All old data was lost, would have to flow on and actually see the runners, short turn, bowl, etc. To give an educated opinion. As we said in the video, there are ways to make heads flow on the bench but does not mean they will make power.

While the exhaust port would be more efficient, yes, header fitment can be an issue. The other issue is the valve cover rail is a bit higher so on FOX style EFI intakes, the intake might hight the valve covers or require a spacer.

If 11R’s come in, we will be glad to make a flow plate and test them.

For you and us LOL, done after a 12 hour day, will prevent that in the future.

Yes, the Canfields can flow a lot more with work and same with the Z304 which now the customers wants to do some blending to. Video was just to show how overpriced the Z304 heads are for the brand loyal enthusiast.

Where or when do you think I can buy a trickflow box intake? Trickflow took them off the market over a year ago due to alleged foundry issues. You can’t find the damn intake manifold anywhere for a 351w. Been looking used for a long time too. They just got the upper part only back online within the past month but without the bottom I can’t use the intake. Curious of your thoughts

​@@timweb1510I've got no good answer for you. I'd suggest you look at other lowers and see if any of them use the same gasket for the upper....or if they are close enough that a little porting will solve any port alignment issues. I'm not familiar with that intake in particular. The only box-type intakes i ever used we made from blown-up intakes...like from a nitrous backfire. We'd take the upper and bandsaw the bottom runners and throttle body flange off and weld our own box together. That way we could put nitrous bungs and vacuum ports where we wanted them as well.

@@timweb1510 Kind of hard to say, Ebay would be the first choice or maybe run an EFI single plane with an elbow. Been running that set up for over 20 years.

Glad I got a pair before the price hike

Look up the old Ford Canfield heads, looks like they might be using that tooling.

@vigilanteperformance8318 I actually had a set of those. They where real good heads back in the day. Champion racing heads ported them for me. 1993 I think.

AFRs dont use offset rocker arms. at least not the 185. they just use a regular scorpion rocker arm they sell on their website what you need is 2 piece pushrod guide plates and that's why AFR and most aftermarket ford heads use them. so you can align them correctly

The Z304 heads do need the offset for the Intake and the 7mm casting helps with valvetrain stability for sure but still overpriced in our opinion.

Look like a Buddy Bar but no idea, AFR had to get their Renegades castings in China because of the delays with BB.

Yes sir, TFA and AFR for the win! LOL, that is me, I left CHP years ago and Vigilante Performance is my company. Might do more testing in the future, now focus is on our cylinder head and engine builds.

And TF 11Rs are even better for 600.00 less than a factory HP head like the z304 for the same CC or larger

@@KingJT80 thats an 11 degree valve angle head z304 and afr are stock sbf 20 degree valve angle. So if you wanna go there lets go with Ford Racing D3's

@@erikalston4496 you cant even compare a D3 to a 11r if thats the case id buy a TF high port 225/240 over a D3 any day of the week (hell, even a AFR renegade 220) and come out ahead with everything machined. D3s dont even have rocker stud holes machined

@@KingJT80 D3 flows 100cfm more than a afr 220/high ports. You shouldn't have compared an 11° head with rotated valves to heads with stock angles and alignment.

@@erikalston4496 I compared a street head to another street head out the box. Shouldn't matter the angle. The d3 is anything but a street head. The z304s are over priced for the same or less power and speed that's why no one buys them much unless they came on a crate engines and everyone runs TF or AFR heads on Windsors

185 is like a 6500+ RPM head a 302 in a truck id be using the 165s so the valves clear depending on what cam you use. TF 170s would also work

@KingJT80 Yea I saw the 165s once I looked on website.

Something people forget is that intake runner affects torque/RPM range. A 165 AFR is proven on 302’s. 185 will also work with the right cam.

@@vigilanteperformance8318i might do the 185 myself on a 302 but its not in a truck, its in my zephyr but we'll see...

Very informative video. A steady camera would really make this excellent.

Correct, they would pick up a good amount but for what they cost, we believe that should have been done by Ford Racing.

@@vigilanteperformance8318 You never get much out of Ford.... They are alll about mega profit...

@@vigilanteperformance8318 Accountants only write checks, they don't finish parts........

Glad to hear that, no matter what shop, I have always done the best possible for my customers.

Good question

The price structure of the Promaxx heads seem to say they were made in China.

Is this Terry ?

It depends on your application. And budget. The 2V heads are comapable with genuine parts. Intakes, exhaust manifolds etc. The 185 3V are better,, a friend has 500 real wheel HP on a 377 Clevo. But then you need the matching intake. I was very surprised by the driveability of them on the 377 BUT that has a 3.7 diff and a 5 speed Tremec. On my 400 Galaxie cruiser with 3.00 they would be useless,, the 2V version a lot better. Though it will stay with 2V 302 heads as they do the job ok. Those CHI 2V heads will sharpen up any mild Clevo. As will most better aftermarket heads. And they are a third of the weight.

@@ldnwholesale8552 So then you are telling me that a 2v head with a larger port and less air flow , will have better drivability then the 185 CHI head with more flow thru a smaller port.

Check out Promax 4V/3V flow test in the replies section... " Stock flow figures of LS3 heads" by Mike Eagle.

Should be fine

From the facts presented in this Promaxx video, I think these heads would be a good choice for your application. The biggest advantage would be the modern combustion chamber design with smaller volume. The compression increase would provide a very noticeable increase in torque and horsepower while still using pump gasoline. The 351M heads would require a lot of work and expense to flow as well as these alloy heads. The reduced weight of aluminum has obvious benefits as well. The exhaust ports being in the stock location will allow more choices for the exhaust system. Too hot for your application ? No way 🏁.

Me too. I'd like to see a closed chamber 2V head with raised exhaust ports on a 400. Something that would raise the compression ratio by a point and a half. Watching this article, I do not understand WHY somebody would go to all the trouble to cast an aluminum Cleveland head and not raise the exhaust ports. Keey the port design so as to be compatible with stock headers, but put it around 3/4" higher. The acknowledged shortcoming with Clevelands is their crappy exhaust ports. But why make some new heads but not solve the exhaust port problem.

Will they fit a 400? I have one.

@@steveharper9964 yes they will.

@@bobkonradi1027 raising the ports on a low buck head makes no sense as it would eliminate using them on a stock shock tower car like a mustang or cougar without expensive headers. Using those headers eliminate any advantage of the raised ports as you simply exchange the port flow issue to a header flow issue due to the shape transition required.

@@Ares-jx4ep if they are raised and your using them on a 302 just order the headers for a Cleveland and should be really close

LS engine is a copy of a Ford engine design so who cares. Notice how the new GM 1000hp crate engine has FORD designed even spaced intake runners for the heads and intake 🤔

@@nova467spanker wrong

@@mikeeagle2653 wrong about what? How about you be more specific... The architecture and design of the LS block is from a Ford FE and the bore spacing is only .02" difference than a SBF. I personally put my stepdads 5.7 LS heads on a Cleveland block just to prove this point - just for fun though and to piss him off chevy made a Ford engine. And yup he new gm 1000hp crate engine has equal length FORD intake runners on heads and intake. ua-cam.com/video/wgSoHlSU3WI/v-deo.html

LS has been beaten to death. They're not interesting or cool anymore. Just an engine that is plentiful in junkyards.

@@Francis_Castiglione lmao 😂 that’s common line from haters. Still winning more races then everything else for less money