My heads are finally on UPS headed home to pappa... Here are the specs.

AFR LT4 castings ported and polished by Race Prep. www.race-prep.com

Intake Port Volume 213cc
Exhaust Port Volume 65cc

All testing done at 28"

Intake lift/cfm:

.050/39.6
.100/74.7
.150/106.8
.200/135.5
.250/166.5
.300/194.4
.350/220.4
.400/242.0
.450/259.7
.500/278.5
.550/298.1
.600/314.6
.650/335.5

Exhaust lift/cfm

.050/25.1
.100/52.2
.150/75.8
.200/104.2
.250/122.1
.300/147.8
.350/165.9
.400/181.0
.450/193.9
.500/201.1
.550/210.9
.600/219.0
.650/232.3

Heads were matched to the following cam specs...

.684/.673 lift, 261/268 duration at .05, and 112 lsa. That is a solid roller grind.


Not too shabby for heads with 213cc intake runners What I didn't mention was that these are 220 castings and that if I want to go bigger in the future there is still a whole lot of room to work with They're going on a street car so we kept it mild this time around

Later
Chuck

 

My god you'll be able to put out some awesome numbers with those. Those flow into ls territory.

 

Looks Great!

One step closer.

FINALY!

 

nice numbers-
but are't phil and lloyd getting those out of stock LT1 heads +-5cfm?

 

Those only beat a 220cc CNC AFR after .550 lift, even with that monster cam my bet is that you will make more power with the 220cc AFR's due to the better flow area.

That .650 number is impressive.

Bret

 

I doubt it. My set of heads ported by Lloyd flowed 287/201 @ .600 lift? They were stock 95 castings with 2.02/1.6 valves?

 

Get that thing together, Chuck! I want to see how it will run....

 

I do not remember Phil's #'s but my flow #'s are close until .400 lift. After that these heads steadily pull away and flow about 10 cfm better at .500 lift, 25 cfm better at .550 and 40 cfm better at .600 lift.

These heads flow MUCH better. Phil's heads may be closer above .500 lift and may even flow better than these below .400 lift. These heads are MUCH larger than you will ever get a stock casting (180-185cc versus 213cc) so on a Hot Cam motor with a stock bottom end the smaller head is better as far as acceleration. A big cubic inch, super high RPM, Lots of NOS or boost the larger runner volume actually helps ya.

The exhaust #'s are the same until .300. Then at .400 are 5 cfm better, at .500 are 15 cfm better and at .600 they are 25 cfm better.

With the size cam that is mentioned he could REALLY use the extra cfm of these heads.

Nice #'s.

NightTrain66

 

Yes, but like I said, these are a street head... they're all about velocity, not peak port flow numbers. If we were doing an all out race setup then yes, there is a whole lot more potential waiting to be unleashed in these heads.....

Later
Chuck

 

I think the chart you guys need to see is the Port Flow Analyzer chart.... There are spots in these heads that almost reach 500 fps. A few numbers didn't show up on the fax, so I'm going to try to get them today from Race Prep. Then I'll try to get them online so you all can check it out...

Later
Chuck

 

Here are the charts for you all to look at.. The velocity one is kinda hard to read though. I'll try to find out what the numbers are that aren't readable.

Velocity

Flow


Later
Chuck

 

my heads from Advanced Induction(phil)
flowed
Intake
.200/147
.300/208
.400/246
.500/268
.550/273
.600/275

so trey mine flow better up untill .500 lift


nice set of heads!

 

Very nice. Those numbers look sort of familiar...

194.1/152.3 @ 0.300"
257.5/188.2 @ 0.400"
298.5/212.7 @ 0.500"
316.7/226.9 @ 0.600"
332.2/230.4 @ 0.650"
333.0/232.5 @ 0.700"
334.4/234.5 @ 0.750"
336.6/237.2 @ 0.800"

 

Cool, they are pretty similar... What size are your intake runners? Mine are only 213 Now all I need is one of those nice shiney Hogans manifolds

Later
Chuck

 

Mine started out as raw 215cc castings, so I would assume that they were a bit smaller than 215cc to begin with. I'm not actually sure what they ended up at, to be perfectly honest. I don't know that Mark had them cc'd after porting.

I noticed that my 0.400-0.500" lift numbers are a little higher on both intake and exhaust.

0.400" lift - 242.0 vs. 257.5 intake
0.400" lift - 181.0 vs. 188.2 exhaust

0.500" lift - 278.5 vs. 298.5 intake
0.500" lift - 201.1 vs. 212.7 exhaust

The raised runners might have explained the intake flow difference, but I can't explain the exhaust as easily. In fact, my exhaust numbers are higher from 0.300"-0.600" lift. What size valves are you using? Mine are 2.100"/1.625".

Well, mine won't work with your heads, so you can't have it.

Excellent numbers, Chuck!