243's vs. 317's
#1
243's vs. 317's
Aren't these heads very similar with different size combustion chambers? I don't see too many guys using the 317's, but I assume that the large combustion chambers are the reason. I have WCCH StageII 317's sitting on the shelf for my LQ9, which will be getting milled between .030-.040 when the time comes.
Here's a look at WCCH's StageII 317's flow data vs. their StageII 243 flow data:
http://www.proheads.com/WCCH%206.0L.html
http://www.proheads.com/WCCH%20LS6.html
The flow numbers are very close with the 317's actually flowing more until the lift gets up around .600, then the LS6's have a definite edge...
Here's a look at WCCH's StageII 317's flow data vs. their StageII 243 flow data:
http://www.proheads.com/WCCH%206.0L.html
http://www.proheads.com/WCCH%20LS6.html
The flow numbers are very close with the 317's actually flowing more until the lift gets up around .600, then the LS6's have a definite edge...
#7
TECH Senior Member
iTrader: (8)
Join Date: Sep 2004
Location: Houston, Texas
Posts: 6,411
Likes: 0
Received 0 Likes
on
0 Posts
I have wondered the same, ive like to get a nice set of 317s from a sponsor and run them without milling them, i bet it will surprise a lot of people, the only work i did on my 317s was milled .030, and i only gained .1 in the quarter and that was with the truck being 100lbs lighter. So what actually made my time drop? Milling the heads to bump up CR or the 100lbs? Im willing to bet it was the weight
Trending Topics
#9
TECH Addict
iTrader: (10)
Join Date: Nov 2005
Location: Tupelo Ms
Posts: 2,114
Likes: 0
Received 0 Likes
on
0 Posts
I read somewhere (can't remember where or if its right) but that the combustion chamber was alittle different design than the 317s.. Supposedly a stock 317 with the same size combustion chamber as a 243 would come up about 20ft lb shorter on torque .. I can't remember where I read this info
#10
I read somewhere (can't remember where or if its right) but that the combustion chamber was alittle different design than the 317s.. Supposedly a stock 317 with the same size combustion chamber as a 243 would come up about 20ft lb shorter on torque .. I can't remember where I read this info
Last edited by budhayes3; 03-01-2011 at 08:47 PM. Reason: misspelling