lets compare a few 210 cc sbc heads

[grumpyvette]

http://www.edelbrock.com/automotive_new ... ads_400X60

http://www.chevyhiperformance.com/tech/ ... index.html

http://garage.grumpysperformance.com/index.php?threads/port-speeds-and-area.333/
cost $1170
lift--flow

.200-136cfm
.300-191
.400-265
.500-272
.600-275
http://www.airflowresearch.com/index.php?cPath=24_33
cost $1599
lift--flow

.200-139cfm
.300-199
.400-249
.500-289
.600-295
http://www.brodix.com/heads/ik.html
cost, $2000
lift--flow

.200-148cfm
.300-217
.400-260
.500-278
.600-284
http://www.profilerperformance.com/sbc-heads-176.html
cost $1000 a pair
lift--flow

.200-129cfm
.300-186
.400-227
.500-271
.600-285

http://www.camshaftinnovations.com/SBF212.htm CANFIELD

Canfield SBF 212cc 20* Head 317 cfm at .700 lift

212 cc Intake runners
2.055 (optional 2.08) Intake and 1.60 Exhaust Valves
Complete CNC in house by CANFIELD
54cc, 58cc, or 65cc CNC profiled combustion chamber standard
An aftermarket piston should be used. If you are using a stock piston, then most applications will require notching of the piston
Camshaft Innovations offers a stud rocker valve train
Valve to piston clearance is another must check dimension
Exhaust ports are raised .400” higher than stock, this will raise the headers approximately .200” on the car. Basically this does affect header selection
Cast from the finest A356 Virgin Billet
Machined on the latest precision, computer controlled machining centers
Can use stock valve covers with modifications
Autolite 3924’s are Camshaft Innovations' choice for spark plugs
Hardened guide plates are included
Assembled to Camshaft Innovations specifications

http://www.skipwhiteperformance.com/det ... =A64210583
THESE CERTAINLY ARE CHEAPER BUT YOU GET WHAT YOU PAY FOR

Call for pricing. All good parts. Springs to match. No ridiculous spring upgrade needed to run any HR, SFT, HFT.

$150.00 Upgrade to mechanical roller

$175.00 Upgrade to titanium retainer

$100.00 Upgrade to 2.08 intake valve

$155.00 Canfield Stud girdle with locks

http://www.j-performance.com/index.php? ... view&id=48

any of these heads will be a huge improvement over stock castings if your building a high performance 383-406 sbc designed to maximize the engines potential, just keep in mind the cars gearing should match the engines power band and with those heads your looking at the 3600rpm-7000rpm band on most 383-406 sbc combs. but shop carefully as there a noticeable difference in cost vs what you get, remember all these heads will require a cam with at least a .600 lift and a 250 dur at .050 lift,at least a 10.5:1 cpr and matching intake manifolds and headers to maximize their flow rates

 

[bob]

one thing Ive seen posted is than when you compare flow rates you'll want to calculate the total flow and not rely on just the peak flow number, because the valves are only at that max lift for a far shorter time than at the lower lift points so those lower lift points constantly have a greater over all effect on the true port flow vs the peak lift flow rate that happens only once and for a shorter time.
as most of us know, increasing the flow of fuel and air mix into the engine tends to increase the power potential of that engine.
I went back and cut & pasted these related bits of info from related threads

 

[grumpyvette]

good point! lets average the flow rates and see what we get from each set of flow figures

you do that by multiplying all the low lift figures by 2 and adding the peak flow rate once and averaging the result and divided by the sample lift points (5 in this case)

example, if we had a head that flowed like this, sample below we would get a comparison number of 376, for that hypothetical sample head, now this means nothing except as a way to compare the other heads against a similar value
lift--flow

.200-130cfm x2=376
.300-170 x2
.400-250 x2
.500-270 x2
.600-280 x1




lift--flow

edelbrock =400.6
.200-136cfm
.300-191
.400-265
.500-272
.600-275

AFR
lift--flow =405.4

.200-139cfm
.300-199
.400-249
.500-289
.600-295


brodix
lift--flow=418

.200-148cfm
.300-217
.400-260
.500-278
.600-284


profiler
lift--flow=382.6

.200-129cfm
.300-186
.400-227
.500-271
.600-285

now this just tends to point out the advantage of low and mid lift flow over just looking at the peak flow rate numbers, and its just one way to compare head flow


related threads

viewtopic.php?f=52&t=322

viewtopic.php?f=52&t=333&p=1870&hilit=+port+stall+cross#p1870

viewtopic.php?f=52&t=322&p=722&hilit=+port+stall+cross#p722