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Just took a pair of performer rpm heads to my machiist , guide were oversized by .003 , decks measure 80 on profilometer , and .005 runout on several seats. Don't even ask me about my 440 source stroker crank for our 383 block ; the mains were .0005 under factory specs for a stock crank giving us .005 clearance. At thiis time .001 undersize is not availble to tighten it up. I get this answer " We grind them that way so people don't end up with a tight clearance" so just throw the numbers out the window and do whatever you like. It always the customers problem not the supplier.

boat anchor

This is the 3rd time I have watched this clip. I just got some CHI 4Vs and go Clevland. That is all Ozzy had for years. Build 'em so they don't blow up, and Bob's your Uncle! The engines with 2v opens but these, these are newish!

about 50 cfm off of DV basic port job lol

Imagine if Edelbrock made an SBC/BBC 4500 intake based on the Performer RPM but with longer runners. Max torque at 3500-5500 for a boat. No hood to worry about!

even the partial dimpling was excessive. try : only dimple the middle 1/5 th of the length. you gain in the mid valve lift, and not loose on the full lift.

Hi ! Eric...Just a question have you ever flowed a dual quad tunnel ram ? I would really like to know they say they are the king of N.A.E. intakes. Can you test one in an upcoming video please. Thank you ! Yes subscribed too.

It was 8 or 9 years ago I was looking for heads and I found some and bought them from summit racing it said from dyno numbers I read I never built engine or went to dyno but numbers I read the summit heads are supposed to have 30 more hp than a 365 hp double hump head. I bought both cylinder heads brand new for 700 that's about what getting g a pair worked would cost. They come with 2.02 1.6 valves. That's not bad deal for engine with over 400 hp.

Great testing/video! Thank you.

You build heads and can't swap springs between the heads... Sounds like you just want free stuff 😂

Nice content and info? How much do these cost in June 2024?

Eric,why would you want the smallest csa at the pushrod pinch as opposed to the throat,just curious.?

it's "Ed L Brock" ......so many people say it wrong, so it really don't matter Eric .... LOLOL.........OnWard.......

You’re supposed to be paying extra for brand name heads like this so you can truly bolt them on and go. Tight guides, wavy mounting surface, and shrouded valves means Edelbrock quality has tanked. It seems like right after Vic passed away they went and DOUBLED most of their prices. Edelbrock heads are around $2000 and up and if I can get CNC AFR heads for similar money then it’s a no brainer. I haven’t read good things about Edelbrock’s budget head.

I thought that the Vortec head would be a fad thing considering all the better heads available nearly thirty years later. If only GM had come up with the Vortec design twenty five years earlier!

still have set of 461 461x were better had 67 camero 327 461 heads hyd stocker class cam 3500stall 513 gears ran 1215 in quater

So get some Promaxx 200.

I really like your stuff man. Very good trustworthy. but to make the big money you have to commercialize. I hope you dont. But then you cant tell the truth if they suck. Thats the worse thing about youtube influencers.

Hey Eric, thanx a lot for your hard work to create real content ! Love watching it since ever I guess altho I´m a Ford guy from Europe. But hey, could be worse. Some dude managed to set his RV on fire while it was parked right next to my freshly rebuild 98 Club Wagon. Don´t be discouraged by minor setbacks, life is good ! RIP dyno mule legend !

I think car craft did a 355 with these perf RPM AG, 250-260 550+ lift solid FT, lots of comp. They got 530hp out of it. Thanks for sharing Eric always enjoy the tech!🤘

I just had a question it just popped in my head what if you habe a head with terrible low lift flow and amazing high lift flow vs a head with amazing low lift flow but terrible high lift flows which one do you perfer if that is ever a case

I had a brand new set of these stolen out of my garage years ago and never recovered them. What can ya do? I hope they dropped a valve on whoever did it. 😅.

A "Eldebrock" intake? You lost me on that one.

Thanks for sharing Eric! Awesome content. You teach well

Do these flow as good as the 906 GM heads?

thats nice they have some potential

ran these heads forever! had them in 4 different rides and they came off a boat motor that had the edelbrock 383 motor

ran 6.48 @ 105 mph with these heads with vortec supervictor intake with comp hyd. roller on a 383 with 11 to 1 compression @ 2975 race weight. put motor in buddies camaro and went 6.20s

Years ago I purchased a couple of Edelbrock heads and one of the heads had a differant spring compaired to all of the other. It was a thinner spring and if I didn't catch it, it would have destroyed my engine. Won't buy Edelbrock, I stick with TrickFlow....

I would love to see you do a back to back dyno test and flow numbers betweeb back cut and non back cut intake valves, Your theory is sound but it would be great to see what it actually changes.

Superb

The vein is vortec like captains bars head like 96 Tahoe swirl good gas milage head 96 suburban Got the flamed tumble vortec like 906

I reading about my protopline heads and had terrible low lift flows which I remember you told me that our first call when I was trying to get a set at the time and now I did but when I saw the low lift number that was really low and since you said chamber on that head and I knew back cut doesn't help I went dam no wonder protoplines could of maybe had that problem by the way there still sitting in my garage just had no money yet

Oh dang now I see why 2 reasons what's caused really bad low lift flows but my question is what let's say you had a cutter that doesn't bring out the chamber wall and you had the port the chamber out to unshroud the valve how far is it supposed to be pushed out without taking away to much

I’ve got a set done by Reed cams they were big into nascar

Say it with me: Ed-Uhl-Brock. Not El-duhh-Brock.

I started watching this thinking meh. But I learned some things instead. Thanks Eric.

Ive watched a few of your video's in the past and always found your content to be extremely informative, well presented and very professional. Ive built sprint car motors for the past 40 years and enjoy seeing what others are doing in an effort to push the envelope. I find it to be an excellent way to broaden my own knowledge base and see things from a different perspectives. This particular video got my sub. Keep up the great work

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It would have been nice if all vortec and later heads were dual pattern. GM had to have known that folks would want to use them with early manifolds. Let alone edelbrock.

Good video Eric. I always like how you talk about and are an advocate for good valve jobs and back cut on the intake valves. I have been an advocate for the same things for many years. It certainly works. Have a great day. 👍

As i sit at my bench and compare my cast iron heads Eric wont port... Its not so much that he won't, as is he dont" quote.

I cant wait till Elderbrock makes a head for Cummings diesel engine.

The faster you can raise the valve, generally the more power you make.

i have a set on a 355 that i had built back in the early 80s the motor still together and in my 51 pickup

i had one of them back in the 80s but i only had one

Im building mine with 615 lift solid roller

Yea why i ant an apple person i use a umidigi bison unlocked 180 .00 phone water ptoof and it ass ddr4 memory 5 thous camera all that mess works fine huge battery h20 mobile wireless att 20 a month or 60 a year on no data plane ulited text n calling phone fer bizznezz good fer old people to only place i know you can buy service by the year

I'm currently building a SBC 408 with a set of 292 turbo heads 300 CFM port and Polish

What about Kaufman heads for Pontiac?