|Dodge V-10 / Viper|
recently ported an iron V-10 head. In stock form it flowed
203.3 cfm. When we finished it flowed 224.4 which is a
theoretical increase of 54 H.P. During that same time
we had a Viper head in the shop that had been ported by
a local competitor to the tune of around $1,000.00. Understandably,
the customer did not want to sink more money into that
head so we left it alone. We did, however, test the head
and it flowed a disappointing 212.6 cfm. The moral of
the story is: be careful who you let port your heads.
Whether you choose us or another shop, make sure you pick
a shop that has experience with Vipers as well as with
a flow bench. Shop around. Compare our prices with that
of our competitors. We pride ourselves in providing the
highest standards at the most competitive rates.
LABOR PRICE SCHEDULE
If you've visited any of the other pages on this site
you may have noticed that we normally offer 3 different stages
of porting options. We have removed the stage I and
II options for the Viper head because it really takes the stage
III level of porting to get this head where it needs to be.
We realize that if you've gone to the trouble of removing the
heads from your Viper for performance enhancements, you are
most likely looking for all you can get and you won't be happy
with anything less.
We're currently seeing around 280 cfm on our ported
Gen II heads where they were around 225 in stock form.
That's a theoretical increase of 140 H.P!
Stock Valve Job
** Competition Valve Job
Replace valve guides
Machine seats for larger valves
Volume chamber & mill for specific compression ratio
Surface exhaust manifolds
Port / Port match intake manifold
* Stage III does not include cost of valves
** Competition valve
job is any deviation from stock ie: larger springs, longer
Competition port job - full competition port and
polish complete with larger valves installed *and
chambers reshaped to accommodate the larger valves. The
stage III port job will increase your head's efficiency by
approximately 55 cfm @ 28" which calculates to a gain of around
140 H.P. on a V-10
Stage III Package:
Package includes stage III port job, stainless
Manley 2.02 and 1.6 valves, Comp Cams 930 dual springs, Manley
titanium retainers, new 10 degree locks, surfaced and ready
to bolt on with a guarantee of at least 280 cfm on the gen
II heads. Your heads or exchange.
Here's a Viper cumbustion chamber
in stock form, notice how
close the chamber wall is to the edge of the valve.
If the larger
valves are installed and this chamber left unmodified,
will actually flow less air than with the stock size
Usually valve unshrouding can be done
quickly and easily
in a valve guide and seat machine using radiused carbide
cutters, but because of the shape, location, and design
chamber, all this work must be done by hand.
In Loving Memory
Peter A. Agalzoff
October 02, 1951 - July 05, 2003