What Compression, did you run it at? That's a lot of hp on a 406 I've seen a 427 sbc only made 625 hp on flywheel. So a 406 making 600+ hp 🤔 not saying it can't be done but .....🤔

Mine made 520 not 600+. I’m running 10.3:1 compression

200 runners/flow.. or 200cc ..

@@matthewvarnam4302I just asked him too .. that I didn’t know they made 200cc heads.. n 175cc .. he probably ment to say flow/runner 200 .. ain’t cc the combustion chamber? .. the opening where the valves go..

Trick flow now has a 200cc CNC version available.

Tapered plugs started in '70, so yes.

Not any more!!!

@@richardfehr1838 That's the truth!!

Big difference in power from my 461 heads. Huge

I did a double take when I saw my first set! I could have sworn they must've been milled down.

@@dannydurham5716 they may be. Back in the day when I was running dome pistons on pump gas, the 461 would detonate where the 462 and later wouldn't. Later on I found that the angle plug heads were even better. People think they were for more flow, but I think they changed the plug to stave off detonation. Just My thoughts.

Max ported head with big 76 cc Combustion chamber Started out 200 horse and big swirl great gas milage now 100 horse Great head to practice porting on I actually cut weight of the head to 30 pounds 193s you port match and get 300 horse 350 Decked too easy 50 60 hours to make 300 cfm Boat anchors lol

@@alonzahanks1182 I thought they were 76cc chambers too but Charlie corrected me, they are actually 65cc chambers from the factory. I did find that on one sight that listed them as 65cc chambers as well. Plus Charlie measured the CCs of one of the chambers and got IIRC 66cc. One CC more than what the factory claims them to be is close enough. If the engine those heads came on had flat top pistons the compression would be what it should be to make power. Without the air flow though would be a recipe for detonation. Unless you duplicate what Charlie did to make 600 plus HP.😎👍

@@itseithergonnaworkoritaint7852 Those are actually 84 85 chevy heads They used up in 96 Suppose its possible for them to be a 305 head like 416 with 184 valves but doughtful 624s come in all shapes and sizes probably milled 12 Thousandths my stock tahoe heads were 176 cc hogged out 2 sets that measured 76 and had 9 to 1 compression because of pistons but were still 175 horse with injection tpi heads they were pretty Ballsy lol probably angle cut if 600 horse engine and for sure would have to be 2 inch valves installed didnt say wasnt impossible Its the early Bowtie engine with porting for roller lifters and drilled and tapped for spider a good base engine to build But because no mass air sensor compression was not all0wed for smog till 96 1 early virson in corvette and Camaro being the LT1 engine with 52 cc chambers in 93 94 but had only 300 ponies

Very common and reliable upgrade. Plus It's not hard to do at home.

Don't think they are built by Trickflow and I suspect the flow numbers are worse, but you save bucks.

@@richardfehr1838 Yes, i would say chinese made, no acc blt holes, 180cc and flow figures match Tricflow figures, chamber shape is good..valve jobs are hit and miss..look them up...

I waited for the 200cc versions. They were revealed in 2019 but were not in production. After 2021 I couldn’t wait any longer. I had Straub technologies CNC port them. They flow very well according to their numbers. My motor made good power on the dyno.

@@matthewewing663 oh I know I bought a set of the speedway camel humps ones back in 2020 thinking I would do the same but never ended up useing them till now, they are getting a mild port job and going on a street 400 now. FYI the DHC 200 are a different casting then the 175s I called and asked.

@@taverncustoms I see the 200's are physically larger and taller than the 175's. They wont be quite as stealthy but I wonder what they would do once ported a bit by someone like Eric. They could possibly be big enough for a 427 or 434 SBC sleeper.

I hate to be the one to say this but it is highly unlikely it was the heads. They may have got the blame but things would have to be insanely worn out to cause that. For reference circle track and some boat motors don’t even run oil seals on the guides. They are not overly consuming oil. It was most likely rings.

@@WeingartnerRacing It is difficult to condense all the troubleshooting in to a single post. On motor #2, when I removed the intake, there was a teaspoon of oil on top of the valves in two of four intake ports. The other two ports had their valve open. When that head was removed there was a teaspoon of oil on top of those pistons with the open valves. No carbon on the pistons due to the oil washing them down. This lead to the second rebuild of the heads (which was done be a different shop). When that did not solve it, I continued throwing parts at it - new intake, even a different EFI system. Like you, I concluded it had to be the rings. So the motor came out and went back to the builder. Rings were changed since it was apart. I have those first rings and they are barely worn. This time the shop outsourced the head rebuild to yet another different head shop. Since no other 'smoking gun' was found, they examined the heads with a micrometer and eventually found the issue. Oversize seals fixed the problem. Is it possible the builder lied to me? I suppose. But I did see the oil on top of the valves and pistons myself. Everything kept pointing to the heads, but after two rebuilds I looked elsewhere. Looking back to motor #1, I assumed changing the heads had caused enough of a compression change to take out those rings. In retrospect, that appears to be an incorrect diagnosis as I assumed the Trick Flow heads were properly made. As an aside, the previous heads on motor #1 were original double humps which came on a 350 my dad purchased in 1967. Never touched or rebuilt. Piston #7 was consistently fouling plugs, which led to the project to install the Trick Flow DHC 175 heads.

I have a virgin pair of 1968 L79 Corvette heads with 2.02/1.60 valves that do not have screw in studs or guide plates. This engine also has the 1 year only large journal FORGED crank that many will argue was never made.

@@bowtie0069 Screw in studs came out in 69. Your factory 2.02 heads should have had a 2.5" cutter on the intake side to unshroud the larger valve. What is the casting number on those?

68 is the first year for the large journal crank. Is your heads number 186, they did not have screwing studs or guide plates. Spark plugs are straight plugs and not angle plugs. I made my with angle plugs and screw in studs, straight studs and no guide plates...

The 186 heads were 64 cc, cut down to 59 or 60c

youd have the buy the x bare as they dont have nearly as good of quality parts of the TF heads. TF uses ferrea and PAC springs. i dont know what Promaxx uses for springs. but the project X is a bigger head by 10CCs min anyways

Or he is trying to make his voice sound like mine. I think are voices are worlds apart. I’m redneck.

The more velocity doesn’t necessarily mean more power that is a half truth. If the smaller head limits RPM of an engine, then the larger head will make more power.

Look at DOHC heads, where a 30 cubic inch cylinder will have a 240 cfm port on top of it. If the port is suffficient, no need to crutch it with huge duration cams.

I can't imagine that (however, I'm also no "NHRA rule expert")... but it would be fun to paint a set orange and throw them on to see what happens, anyway! 👍

If you go to a Stock/Superstock NHRA race, nearly everyone is 60+ and has been doing it for decades. Very hard fraternity to break into... and that majority likes to keep it that way, unless it's someone who isn't a true threat. lol As per the heads, unless their current stock is nearly worn out, they aren't going to want to bring in something like that, as it means a very long and expensive development curve. NHRA sometimes does this anyway, especially if people are having problems finding cores, but I'm assuming 186, etc heads are still fairly common in these circles.

They'd allow these in FAST probably

​@@n2omike Actually, we're not a hard bunch to join. Most of us are glad to see new participants, and willing to offer help and guidance. We'd very much like to see new participants in the classes. It isn't the racers who decide what is and is not legal, that's the NHRA tech department. NHRA is hesitant to allow replacement cylinder heads, and you would likely have a hard time getting these accepted. If they were accepted, there'd likely be a 10HP penalty of the HP factor of the combination they'd be accepted on. As an example, the Edelbrock Performer RPM rectangle port head is accepted on my 69 L-72 427/425. However, the head carries with it a 10HP penalty, changing the factor to 435HP. In A/S, where the weight break is 8.0 lbs per HP, that's an 80# weight penalty.

​@@billymanilli What would happen is a minimum one year suspension, and possibly a $1,000 fine.

they have 200cc? never seen them must be brand new ive only ever seen the 175s

@@KingJT80they were just available this weekend it’s been a few years wait for the CNC DHC 200 to finally be available

sportsmanII's arent all that great out of the box, but with some basic work, theyll blow the 461 away.

I have done video on sportsman 2

Correct but I ran tapered seat plugs on them for years when I was younger. It never messed up the threads.

By the way those 187 heads are hens teeth!

@@cliffwright9842he use to have prices on his website, but they may have been removed with the way pricing changes with the economy so fast anymore.

Port them

@WeingartnerRacing Gotcha...was just wondering if you noticed anything in particular that was what probably made them be a little behind the stock ones on the exhaust. This was a fun video for me. Thanks

Big dogs does too, I believe they are in NY someplace.

Been thinking about purchasing a set and trying them on my 300 hp. 355 sbc.

Nope

it’s DZ Performance

@@jimmy_olds Thank You

@@derrelcarter9401 you’re welcome! I just started watching his channel, he’s good 👍🏼

The valve may hit the deck. Small bore. I said may.

I just showed a set. They are 186 heads.

The Speedway double hump is a Flotec 180cc casting head

Whatever someone will pay.

Unless you got blocked it’s there.

@@WeingartnerRacing it's a KZfaq problem on the search problem. Googled it and came right up

It doesn’t hurt them

@@WeingartnerRacing I was told that painting aluminum heads blocks heat escape.

They are better than many aftermarket heads.

nostalgia mainly. Just like Ford guys trying to hunt down GT40 & GT40P heads. TFS had an article out when the heads first came into development about the demand for a “double hump” aftermarket replacement. So probably for the period correct nostalgia guys.