Thanks David, loving the content. Absolute quality

I have struggled to comprehend port energy as it seems to combine many different types of measurements which are hard to comprehend in my simple mind how they relate to each other. Your explanation was very helpful to wrapping my head around it. Thank you.

@NotSure723

4 ай бұрын

Velocity x mass.

I look forward to pt. 2. Every time I eyeball one of these LS3 heads I am immediately impressed by the obvious potential to make HP. The thought that a slightly smaller intake valve and port might actually give good flow numbers and velocity doesn't surprise me though. The stock ones are quite big! Unmentioned is the combustion chamber. These designs are very efficient and as a result don't require much timing in my experience. The stock heads are pretty impressive. These AFR's raise the bar for those who are running enough camshaft to take advantage of the improvements. Good work!

The bullet analogy is a wonderful visual of the air energy.

D V ... thanks a mint for all of your tutorials ... i have all of your publications and those on BB Chevy engines ... much respect for you Sir .

You're needed in today's car world because you add color to a nice picture.

Many Thanks David!

Thanks DV. Valuable information as always. Everyone that is an HP engine builder should have the IOP program.

Thanks

Thank you for all the knowledge you share

My son has a C3 Corvette with an L46 350ci/350HP engine, Thus being based on the famous LT-1 engine I was amazed at it's ferocious power delivery spinning the tyres through all 4 speeds with 3.36 rear gears, I was more amazed when I found the famous "Double Hump" heads had been replaced with 72cc chambered 1.9/1.5 inch valved 441 cylinder heads which I presume was to lower the compression to stop detonation on the crappy pump gas we get, on investigation I learn't that these heads actually flowed as well as the bigger valved "Double Hump" heads, I myself cannot confirm this and am only repeating what I have learn't from the forums, On disassembly of the engine the bottom end was stock with the forged rotating assy still in very good condition, So to me the small valved 441 heads have not hurt the power delivery at all.

Thank you! Look forward to the eval of the Mongoose head.

good show - looking for Part 2

Great info ... I appreciate all you do

Anxiously awaiting Part 2. Another youtuber did a flow tested these only, and they look promising. I like the fact that the intake valve is moved closer the middle, to help unshroud the cylinder wall side. Can't wait on a cam choice. I've been waiting to see your application, since it will be instantly legendary.

Thanks David!

Those heads would be money well spent. 😊 there are many good 5 lift cams that would be great for the streat.

While I get and agree with your statement that lift being key to exploiting these heads, to achieve velocity / energy, for the delta of stock vs AFR valve sizes and CSA, I’m thinking a excellent illustration would be a back - back dyno test, using rocker ratios as the variable. I’d suspect that getting the valve lift into the .700” range would be were they would shine. I’d also like to see more specifics on the valve job. I’m tending to think the departure angle along with reduced shrouding of the chamber architecture are a large part of the performance of these heads, and refinement of the valve job would realize sizable improvements, further still. Another thing not yet discussed is applicable bore sizes and engine displacements for these.

@DavidVizard

4 ай бұрын

to answer your questions. Watch part 2.

@Drunken_Hamster

3 ай бұрын

@@DavidVizard Where is part 2?

Also I answered a question back last yr an won a hat. I sent a message that I could not figure out how to retrieve that hat. I sure would like to wear a summer hat of yours.

David, on your IOP program, what numbers do you enter into the 'swirl' column, if you don't have any swirl data available?

@DavidVizard

4 ай бұрын

I will be dealing with swirl in part 2.

Thanks DV! v/r wh

Hi the other is i've never seen videos on gearbox and final drive ends it eould be fitting for rear end can mzke huge diffirences

Not bad for an off shelf head. i would like to see the 380 cfm head. That would make a good Super Gas head.

Super !😊

In my ignorance the exhaustion of the exhaust valve opening higher which means on time open extended. Means more spent fuel out an the less of time on the intake is all that is needed to provide maximum air fuel ratio any longer the mix would begin to exhaust

@DavidVizard

4 ай бұрын

??????

What size cam would you recommend an compression to enhance the head to max performance an throttle body size.

On a direct injected engine, does flow only matter since there's no fuel to maintain atomization and suspension?

Interesting.....

Hi david what eould be the difference in hp using a 4 cam 350sbc motor to a 8 valve

My wife wants to know what do you do woith your old moldings?

@andysteele4056

4 ай бұрын

There it is. I knew someone would go there. lol.

Part 2???

Have you ever used trick flow twisted wedge heads?

👍👍👍

@Mr. Vizard: The 125,-$ program comes in Metric too?

@DavidVizard

3 ай бұрын

yes

👍💪

Hi David, whats your opinion on using hard chromed stem stainless valves in iron guides?

@bcbloc02

3 ай бұрын

I can’t speak for David but most big diesel stuff runs chromed valves in cast iron guides and they last great.

This might be a dumb question, but can anyone tell me what head this is. I see two LS3 heads on the AFR website. They have the Mongoose (ported) and the Enforcer (as cast). Nothing listed as the "Super".

@servediocylinderheads

4 ай бұрын

New AFR Enforcer LS3 2.08" valve 240cc.

@DavidVizard

4 ай бұрын

Sorry for the confusion but 'super' was intended as my description of this Enforcer head.

@Drunken_Hamster

3 ай бұрын

The one discussed in the video is the Enforcer (as cast).

Will IOP include cylinder head test data for these and possibly other LS heads?

@DavidVizard

4 ай бұрын

yes!

@evcass69

4 ай бұрын

​@DavidVizard I installed the 14-day trial, and I only see 16 sets of head data, and the most recent LS is Vortec from 2020. How do I obtain more test data to evaluate? All I want is large sets of accurate LS test data to use in EAPro even if I need to pay for extra features.

Dv,how good is the valve job and is it within.001 in the consintricity?

@hotrodray6802

4 ай бұрын

Uneven heat expansion changes everything.

@davidreed6070

4 ай бұрын

@@hotrodray6802 hopefully they stay round. If they are not concentric from the start they are not going to get concentric with heat, what do you think?

Did you just drop/bang the machined durface on a linoleum floor? Ever hear of working on a bench made of non-marring material?

@DavidVizard

4 ай бұрын

Since this head will meet the band saw I don't think it matters!

@trailerparkcryptoking5213

3 ай бұрын

We found the social media narcissist!

FIRST

@hotrodray6802

4 ай бұрын

Tough work, but somebody has to do it 👍👍😆😆

🔔😎🇺🇲 Packed to survive a nuclear war.👍👍