Those Hemi heads put down some good numbers stock. Plus, they have the benefit of the valve unshrouding itself every time it opens by moving away from the cylinder wall. I think down the line you will really see some big numbers. I would like to see what the SRT Hemi heads put out.

 

Does anyone have a picture of a new age Hemi chamber?

 

here are some ported head numbers from patriot. i dont know how well they work with lsX heads and so forth, but here ya go. look kinda pathetic to me.

http://sites.reachtheworld.tv/waterN...05244&DID=1225

 

I remember seeing some ported 4.6L DOHC flow sheets a while back that were in in the 350cfm range on a 3.55" bore, unsure about stock though...I will see if I can find them.

*Edit*-Here are intake flow numbers, bone stock 4V.
050 44.9
.100 84.9 8
.150 133.4
.200 172.4
.250 202.3
.300 225.1
.350 243.8
.400 258.1
.450 264.4
.500 267.6
.550 268.0
.600 267.3

Ryan

 

This is off of KRC Performance's website. The R/T heads are Mopars aftermarket heads for our Magnum V8's. I'm trying to dig up some production head numbers. The Eddy heads have 1.60 ex valves, the R/T's have 1.625.

Untouched castings both with 2.02 intake valves and 3 angle valve jobs.


Edelbrock heads Magnum R/T
In Ex In Ex
0.100" 65 59 64 49
0.200" 116 104 116 103
0.300" 168 136 172 141
0.400" 211 165 211 166
0.500" 232 176 233 178
0.600" 236 183 239 188

Ported castings both with 2.02 intake valves and 3 angle valve job
Edelbrock
Heads

Edelbrock Magnum R/T
In Ex In Ex
0.100" 68 79 67 62
0.200" 140 126 142 129
0.300" 199 162 204 159
0.400" 248 193 258 188
0.500" 269 207 283 204
0.600" 274 212 289 209

Here are some numbers for the 4.7 Dodge V8 heads.

Stock HO heads
228 cfm at 0.500 lift and 28".

KRC ported.
243+ cfm @ 0.500 lift and 28"
256+ cfm @ 0.550 lift and 28".

 

what was done to the heads?
I bet your heads make better power/tq exhaust side is very important and yours is better.

 

here are #'s from Shady Dell Speed Shop (mopar only).

FLOW #’s 2.02 intake valve R/T casting” Version 1.625 exhaust

LIFT-----AS-CAST--------PORTED
.100”----72.5/N/A--------74.1/N/A
.200”----131.1/117.3-----138.3/105.3
.300”----189.8/158.7-----200.1/151.8
.400”----231.2/175.9-----245.0/186.3
.450”----245.0/179.4-----265.7/193.2
.500”----255.3/181.1-----282.2/198.3
.550”----258.1/182.9-----296.7/202.0
.600”----254.6/184.9-----303.6/204.6
.650”----252.5/186.3-----301.9/207.4
.700”----246.7/186.3-----293.3/209.1

FLOW #’s 1.92" intake valve R/T casting” Version

LIFT-----ASCAST--------PORTED
---------IN/EX----------IN/EX
.200"--135.6/110.4---148.4/111.8
.300"--194.9/154.9---208.7/155.3
.400"--227.4/173.5---243.2/189.1
.450"--233.9/177.3---252.5/194.6
.500"--239.4/179.4---255.6/197.7
.550"--244.9/180.8---259.1/199.8
.600"--245.0/181.8---268.4/201.2
.650"--245.0/181.8---276.0/203.2
.700"--241.5/183.2---281.2/203.2

All #’s at 28” of Water
1.92”/1.625” MP 8MM Valves

The Chevy guys if they are making 342cfm on a stock 6.0L casting have us beat by a long shot, we ahve to step up to indy or a W5 head at least to get 340cfm's on an intake.

 

Here is more porting #'s with the Edelbrock 2.02/1.6 aluminum magnum heads. These are from www.shadydellspeedshop.com as well .

FLOW #’s
LIFT-------AS-CAST---------PORTED
.100”-------72.5/N/A-----------75.9/N/A
.200”----131.1/107.0--------146.6/107.0
.300”----182.9/151.8--------207.7/156.0
.400”----216.6/181.2--------252.9/200.1
.450”----227.7/182.9--------269.1/207.7
.500”----235.9/185.6--------276.0/217.4
.550”----238.7/185.6--------285.0/221.5
.600”----242.2/185.6--------295.7/225.0
.650”----243.2/185.6--------300.2/226.7
.700”----243.2/185.6--------298.4/228.8

All #’s at 28” of water
No flow tube on exhaust port
2.02”/1.60” Edelbrock Stainless Steel Valves With Proprietary Intake Valve Back Cut Angle.

 

Yeah it is almost not believable the differences between the differences in the 6.0/ls6 heads over the others when you look at some of the other engine comparisons between the 3!

 

me and friend got into this discussion last night at the local bar

I kept telling him thats what kills ford is they're heads dont flow in stock form and gm's heads flow alot better stock vs stock thats why the 5.3 will kick the 5.4 around all day long. He didnt believe me

so who has the flow specs on stock 5.4 and 4.6 heads not the svt heads your everday run of the mill