[DeTomaso] High Ported Iron Closed Chamber 4V head flow results

[Charles Engles]

Dear Dan,


              You wrote:  "....and shear vanes screwed into the intake port
floors."

              For the amateur engine builder, what are shear vanes?

                             Very curious,  Chuck Engles






-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Daniel C
Jones
Sent: Sunday, February 09, 2014 4:24 PM
To: POCA list
Subject: [DeTomaso] High Ported Iron Closed Chamber 4V head flow results

A while back, Dave McLain flowed a set of old iron closed chamber 4V heads
with the 1970's Pro Stock style high port exhaust plate and shear vanes
screwed into the intake port floors.  I thought I'd share the results.
Flowed on a Super Flow bench.  Tested at 10" and converted to 28".  2.19"
intake valve and 1.71" exhaust. Completely stock combustion chambers.

 Lift   Intake Exhaust
 Inch   CFM    CFM
 0.025   15.9   10.2
 0.050   33.2   28.5
 0.100   65.6   60.0
 0.150  100.6   89.0
 0.200  137.8  109.8
 0.250  167.6  124.1
 0.300  195.8  141.4
 0.350  224.0  155.4
 0.400  245.6  166.8
 0.450  261.4  176.7
 0.500  278.8  185.3
 0.550  289.7  194.7
 0.600  300.9  204.2
 0.650  312.1  215.2
 0.700  322.0  225.8
 0.750  325.7  234.4
 0.800  307.8  239.7

Not too bad for 1970's small block cylinder heads.

Dan Jones

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