My Vortec Flow Numbers

Syclone#2960

Syclone#2960

What ever it takes!!
28" Test Pres. 4" Bore adapter

Stock VORTEC unported head flowed:

1.94 valve
Intake
Lift CFM Temp
.400 212.7 70.7
.450 221.5 70.9
.500 209.2 71.4
.550 209.9 71.6
.600 209.0 71.6

1.5 valve
Exhaust
Lift CFM Temp
.400 136.9 96.4
.450 140.7 99.0
.500 143.5 101.2
.550 145.5 102.9
.600 146.9 104.6
--------------------------------------
Ported Race Stage head. :oops:
2.05 Valve
Intake
Highest out of the six ports.
Lift CFM Temp
.400 213.9 74.7
.450 230.8 75.0
.500 244.8 75.4
.550 251.4 75.6
.600 248.1 76.0

Lowest out of the six ports.
Intake
Lift CFM Temp
.400 213.0 84.1
.450 232.6 84.1
.500 242.2 84.2
.550 241.2 84.3
.600 230.2 84.4
-------------------------------------
Exhaust-
Highest out of the six ports.
1.60 Valves
Lift CFM Temp
.400 170.4 119.3
.450 177.3 122.0
.500 182.2 124.1
.550 185.6 125.7
.600 187.2 126.8

Lowest of the six ports.
Exhaust
Lift CFM Temp
.400 165.6 98.9
.450 170.3 103.2
.500 175.9 106.4
.550 180.0 108.6
.600 182.5 109.9

I have all the reading from .050-.600,but I don't think it is worth typing is it?

I figured at .500 lift an average of:
Intake 34.3 CFM improvement.
Exhaust 38.7 CFM improvement.

Take note that these are a diffrent set of heads and that bigger valves are used on the ported heads.The original numbers of the ported heads before they were ported are unknown.

I found this topic http://www.syty.net/phpBB2/viewtopic.php?t=25184&highlight=flow+numbers

BillC's vortec heads had a lower stock (before porting) number(205@.500) with a higher 52 CFM(257@.500) improvement on the intake.This was done with a mild port job.
The exhaust only improved by 9 CFM.



Well what do you guys think? :wink:
________
BIG DICK TUBES
 
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steve-o

steve-o

Member
good numbers. useful info. it would interest me to see what's going on below .400" lift. after all, that's where the valve spends most of it's time. there is much flow, and henceforth, power to be found at low lift too. just a thought.
 
9

93ty475

Donating Member
interesting....i don't think i've ever seen stock flow numbers...good info...

edit: i didn't catch at first that your stock flow numbers were "vortecs" as well....
 
ghettosled

ghettosled

SYTY SUPERSTORE
who's stage 3 porting is this? I would say the numbers are decent. thanks for taking the time to post your results!
 
Syclone#2960

Syclone#2960

What ever it takes!!
Mike I sent you the pics of the 20G for your friend.I'll send you the port pics in few days. :hang:
________
NX50
 
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