David Vizard compares stock LS3 head to AFR LS3 Enforcer
#1
David Vizard compares stock LS3 head to AFR LS3 Enforcer
I'm not sure the best place to post this, move if desired. David compares CD, port energy et al between OEM LS3 head and AFR as-cast LS3 Enforcer 238cc head. He claims AFR has a CNC version of this head as well, I presume he's referring to the older 260cc Mongoose and maybe he'll do the same for it in the future. Does David's historical knowledge easily transfer to LS long blocks? Are there new ideas from say Darren Morgan, Tony Mamo, etc. that supersedes David's knowledge?
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G Atsma (03-18-2024)
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G Atsma (06-24-2024)
#4
TECH Veteran
I still HAVE NOT seen a AFTERMARKET LS3 worth the extra cash over stocks. Flow numbers are cool but we cant bench race those.
My cookbook thread showed multiple LS3 heads with different cams, intakes etc. They all run the same identical number at the drag strip. If i remember right one of the fastest LS3 headed cars in the thread had a some UNTOUCHED LS3 heads and a factory GM LS3 intake.
My cookbook thread showed multiple LS3 heads with different cams, intakes etc. They all run the same identical number at the drag strip. If i remember right one of the fastest LS3 headed cars in the thread had a some UNTOUCHED LS3 heads and a factory GM LS3 intake.
#5
TECH Senior Member
I still HAVE NOT seen a AFTERMARKET LS3 worth the extra cash over stocks. Flow numbers are cool but we cant bench race those.
My cookbook thread showed multiple LS3 heads with different cams, intakes etc. They all run the same identical number at the drag strip. If i remember right one of the fastest LS3 headed cars in the thread had a some UNTOUCHED LS3 heads and a factory GM LS3 intake.
My cookbook thread showed multiple LS3 heads with different cams, intakes etc. They all run the same identical number at the drag strip. If i remember right one of the fastest LS3 headed cars in the thread had a some UNTOUCHED LS3 heads and a factory GM LS3 intake.
It's a darn good head! And the LS3 intake is a great match for them. As I've said, adjust your preferred power level with a cam and/or a turbo or supercharger.
#6
I don’t know about the LS3 line of Enforcer heads but the others for Ford & GM are the same Chinese heads that every other Chinese head vendor sells. Except the Enforcers have AFR valvetrain & hardware. If memory serves they’re the same casting as ProComp in some applications. I believe I read that one of the offerings in the Enforcer lineup is a Chinese stock 243 head knock off.
Last edited by Y2K_Frenzy; 06-25-2024 at 08:17 PM.
#7
TECH Fanatic
I don’t know about the LS3 line of Enforcer heads but the others for Ford & GM are the same Chinese heads that every other Chinese head vendor sells. Except the Enforcers have AFR valvetrain & hardware. If memory serves they’re the same casting as ProComp in some applications. I believe I read that one of the offerings in the Enforcer lineup is a Chinese stock 243 head knock off.
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Y2K_Frenzy (06-26-2024)
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#8
I just looked at the ad and AFR says they flow up to twenty more CFM than OEM. So it’s more or less an OEM head copy with smaller valves I guess. I think I can sneeze more than twenty CFM.
#9
TECH Fanatic
This was before the port work, so I'm interested in seeing how it does with the minor cleanup. One thing to mention is that I had spoken with Mast about their small port LS3 heads for my 404, and they said that they have seen turbulence with their small port heads above 6500 RPM on 400+ cubic inch engines. So, I don't know if that is coming into play here. In the video, they are pointing at the camshaft's LSA, but I don't think an LSA is going to cause a plateau in the curve like they saw.
Last edited by MuhThugga; 06-26-2024 at 01:28 PM.
#10
TECH Senior Member
i actually wonder how much the stock LS3 improves with just a good multi-angle valve job and bowl blend. Those 2 things usually gain more than hogging the ports out.
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LilJayV10 (08-03-2024)
#12
It is a smaller valve, a 20cc smaller port, and a 12 degree valve angle. The interesting thing is that they put the head on a 416 stroker and had an issue with it falling on its face in the upper RPMs, but until that point, it was beating out the stock LS3 head.
https://www.youtube.com/watch?v=TJS8PNPWnDA
This was before the port work, so I'm interested in seeing how it does with the minor cleanup. One thing to mention is that I had spoken with Mast about their small port LS3 heads for my 404, and they said that they have seen turbulence with their small port heads above 6000 RPM on 400+ cubic inch engines. So, I don't know if that is coming into play here. In the video, they are pointing at the camshaft's LSA, but I don't think an LSA is going to cause a plateau in the curve like they saw.
https://www.youtube.com/watch?v=TJS8PNPWnDA
This was before the port work, so I'm interested in seeing how it does with the minor cleanup. One thing to mention is that I had spoken with Mast about their small port LS3 heads for my 404, and they said that they have seen turbulence with their small port heads above 6000 RPM on 400+ cubic inch engines. So, I don't know if that is coming into play here. In the video, they are pointing at the camshaft's LSA, but I don't think an LSA is going to cause a plateau in the curve like they saw.
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G Atsma (06-26-2024)
#13
TECH Fanatic
To me, it seems like there is an issue with the valvetrain. Off the bat, the valve springs that come with those heads are rated to .600" lift, but the cam had something like .630" lift. Maybe I missed it, but I don't recall the video mentioning that they changed valve springs.
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G Atsma (06-26-2024)
#14
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G Atsma (06-26-2024)