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is it really worth it
https://www.slantsix.org/forum/viewtopic.php?t=34272		 Page 2 of 2
Author:  theslantingsix [ Sun Mar 15, 2009 9:54 am ]
Post subject: 
ok i understand the 20% more flow now and that makes it seem worth it

and not to pry in to yalls business but how much did it cost you at the machine shop for the work and every thing
Author:  stonethk [ Sun Mar 15, 2009 11:12 am ]
Post subject: 
Here is some discussion on price:

http://www.slantsix.org/forum/viewtopic ... ht=#221379
Author:  SlantSixDan [ Sun Mar 15, 2009 12:23 pm ]
Post subject:  Head milling
Quote:
Mill of .100 from the head while you are in there
Rock, all the advice in your post was excellent except ↑ that ↑ . There is no "one size fits all" head milling prescription that's guaranteed to work well without making problems — remember, there's a great deal of variability in combustion chamber volume both across and within slant-6 heads, and cutting without having bothered to measure runs the risk of disappointment with the result. Best to measure (CC) the combustion chambers so he knows what he's starting with, and then decide how much to mill the head (or, often a better choice, the block).
Author:  rock [ Sun Mar 15, 2009 12:43 pm ]
Post subject:  Why do I always end up saying 'Dan, I agree with you!"
Dan,

Point well taken. I surely agree...I had mine cc'd bbefore adn after, and when posting had it in mind he was the guy who reported his chambers' size. this week. I was thinking of those 76 cc chambers and seeing mine at 44. To be sure one ought to know where one is at start and know where one wants to end up.

Another point though..a 20 percent increase in valve surface area won't yield a linear 20 percent increase in flow. I thibnk a flow bench test is always proper after major head work, if for no other reason than saying darn, I wish I had done a flow test when I had the head off.

Last, 'zilla's post where he said "... included 12 guides, oversize valves, porting and flowing, springs, retainers, locks, and a cleanup mill to make it flat"....that is my planninglist. Anytime I have had that work done (not often!) it is $600 to $800 and worth every dime to me. Just do one yourself one time and spend 30 hours porting...what is your time worth? $20? There goes $600 for deadly dull work, and only a few shekels left for the fun machine part with a CNC setup cost. Knowledgeable head work costs. My guys have been doing slant six heads since the 60's and can tell great racing stories.

rock
'64d100
Author:  SlantSixDan [ Sun Mar 15, 2009 1:07 pm ]
Post subject:  Overcooked brussels sprouts are yucky
Quote:
Dan,

Point well taken. I surely agree...I had mine cc'd bbefore adn after, and when posting had it in mind he was the guy who reported his chambers' size.
Oh, okeh, I must've missed that.
Quote:
To be sure one ought to know where one is at start and know where one wants to end up.
Well, on the other hand, if ya don't care where ya are, ya can't really get lost! :twisted:
Quote:
Another point though..a 20 percent increase in valve surface area won't yield a linear 20 percent increase in flow
Agreed.
Quote:
Knowledgeable head work costs.
Yup, work requiring any kind of special knowledge, skill, and/or experience costs…and that's as it should be.
Quote:
My guys have been doing slant six heads since the 60's and can tell great racing stories.
I'll bet!
Author:  Aggressive Ted [ Mon Mar 16, 2009 11:52 am ]
Post subject: 
Joshie225,
Quote:
I can add that bigger valves and a ported head along with a 4bbl and 2 1/4" exhaust made my otherwise stock '67 Valiant over 2 seconds quicker in the 1/4 mile. Same stock '67 short block, cam, etc. 3.21 gears and a column shifted 3-speed. Previous best was 19.23, current best is 16.86. The car is much more fun to drive and still gets good mileage.
What four barrel were you using and how was it jetted? A Holley 390 or 600 or ?
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