Small Block Head Flow Chart

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TurboGLH

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I'll add any flow numbers contributed by a member, but I don't want to take info from someone else's website if they haven't given permission. But no reason that people can't link like they have been, and use the info to compare to what we've compiled here.

h ttps://docs.google.com/spreadsheets/d/15SOi3ZNKQOGbLAcOgtiM_w6snBml-d5M0rKCrNZREpA/edit?usp=sharing

(remove space and copy/paste to view in it's own window
 
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edelbrock CNC heads by Modern Cylinder Heads...in pdf file
 

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RHS/Indy LAX head, 1.92/1.62 valves, @28”, 4.00” bore, no tube on ex, ootb:

Lift——in/ex
.100— 66/55
.200—118/104
.300—172/145
.400—217/167
.500—246/174
.600—253/176
 
IMM-prepped RHS heads from their website: http://www.immengines.com/indyimmironheads.html

upload_2019-12-3_9-54-45.png
 
Here is some numbers from some EQ heads that I bought through my local machine shop in Winnipeg. The owner let me come in on a Saturday and do some clean up on the bowls first and then do a bit of porting under his guidance. The valves are long stem LS Chevy 2.02/1.60 that they had on the shelf.
Basically the heads are similar to IMM EQs. I would like to buy a set of bare aluminum heads in the future and try a more in depth porting job.

3C55E72B-4612-45A7-8F41-93BDEB0ACA6C.jpeg
 
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Here are the flow numbers for my Stage II ported Edelbrocks, ported by Ryan Johnson at ShadyDell.

LIFT--IN/EX
.100"--63.0/NA
.200"--137.9/98.2
.300"--191.6/141.9
.400"--243.8/171.9
.450"--262.2/181.5
.500"--281.3/188.4
.550"--289.8/193.8
.600"--292.9/196.6
.650"--292.9/199.9
.700"--292.9/202.1
 
Bone stock 308 casting, no pipe on exh.
.100......54........45
.150......80........70
.200.....117.......87
.250.....150......108
.300.....164......126
.350.....183......139
.400.....195......150
.450.....205......159
.500.....207......162
 
CNC IndyBrocks out of box 2.055 1.6 valves, Indy's exh #s are without a pipe, mine are with a pipe
column 1 Indy's advertised #s
column 2 actual out of box #s
column 3 fixed valve job and better Ferrea valves
----------1----------------2--------------------3
.100 72/66..............59/49 ................ 65/49
.200 132/113 ......... 123/108 ............ 150/113
.300 197/145.......... 180/150 .............204/155
.400 248/170 ......... 229/178............. 248/184
.500 277/183 ......... 261/194 ............ 280/206
.600 302/191.......... 284/208 .............292/215
.700 306/197...........284/215............. 287/222
 
Stock RHS/Indy LAX head 1.94 intake/1.60 exhaust no tube......

.100 57/52
.200 124/105
.300 184/143
.400 230/163
.500 255/167
.600 257/167

Ported RHS/Indy LAX head 1.94 intake/1.625 exhaust w/1-3/4" tube......

.100 NA/NA
.200 144/131
.300 191/173
.400 234/201
.500 264/222
.600 280/236
.700 283/238
462 HP on a big bore 292ci/273

Ported RHS/Indy LAX head (8 cylinder avg.) 2.055 intake/1.625 exhaust w/1-3/4" tube......

.100 NA/NA
.200 145/124
.300 206/176
.400 253/214
.450 275/226
.500 290/236
.550 301/242
.600 303/248
.650 297/253
With these heads a 360/424 single 4-bbl stroker made 474 LB-FT @ 3,000 rpm, 574 LB-FT @ 5,100 rpm and 629 HP @ 6,400 rpm. Solid roller 258/260 @ .050, .660/.668 w/1.6 rockers, 110 LSA, 107 ICL and 91 octane pump gas from the Stinker Station.
 
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SM CNC - Flowed by @PRH

Lift—- in/ex
.100— 64/49
.200—126/95
.300—166/132
.400—206/163
.500—242/179
.600—271/187
.700—284/190
 
Screws numbers aren’t really very viewable on my phone, so I tightened up the columns:

CNC IndyBrocks out of box 2.055 1.6 valves, Indy's exh #s are without a pipe, mine are with a pipe

column 1 Indy's advertised #s
column 2 actual out of box #s
column 3 fixed valve job and better Ferrea valves

Lift——1——————2——————3
.100 72/66.........59/49 ..........65/49
.200 132/113....123/108.......150/113
.300 197/145....180/150.......204/155
.400 248/170....229/178.......248/184
.500 277/183....261/194.......280/206
.600 302/191....284/208.......292/215
.700 306/197....284/215.......287/222
 
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SM CNC flowed by @PRH

Valve job, back cut valve and a blend.

Lift——int
.100— 67
.200—132
.300—191
.400—232
.500—262
.600—275
.700—281
 
Iron #974
11/32 nailhead w/undercut stem 1.94/1.60 valves blended in, minor guide trimming.
--------Int--------exh
.100..64.............
.200..128.....103
.300..191.....146
.400..229.....169
.500..241.5..180
.550..241.....192
.600..240......199
 
894 x head.
11/32 2.02/1.60 under cut stem valves
Ported. @28" 4" bore
----------int-----exh---
.100..68........
.200..131...110
.300..191...137
.400..238...152
.500..262...188
.550..266...190
.600..271...191
 
eddy head...2.055 intake 1.60 exhaust...

100 72/55
.200 148/108
.300 204/149
.400 247/181
.500 278/202
.550 285/207
.600 292/210
.650 290/211
 
SM 2.055 intake 1.60 exhaust

.100 74/56
.200 150/109
.300 205/150
.400 245/180
.500 272/200
.550 281/205
.600 290/209
.650 289/211
 
580C9FE4-9CC4-4F08-AAE2-9FC4B0C7188A.jpeg
I wonder? Seems I’ve seen these blowing 340cfm
I haven’t blown any holes yet, so not there.
 
SM 2.055 intake 1.60 exhaust

.100 74/56
.200 150/109
.300 205/150
.400 245/180
.500 272/200
.550 281/205
.600 290/209
.650 289/211

Did you do any chamber work to go along with those larger valves?
 
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