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Hey, engine builders, I need some guidance. 120-130 1966

uid 18886's pic
posted by  sdewolfe on  Thu Sep 20 10:27 CST 2007
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last visit: Mon Jan 31 05:56 CST 2011
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To shorten a long story, I need to prepare my "spare" head to replace the one rebuilt 27K miles ago. (Hardened seats, as I requested, were not installed.)

HP is not the goal, low end torque and MPG is what I'm after. Since improved VE is always a good idea anyway I thought I would get some suggestions from you guys.

The setup is completely standard; HS6 carbs, B18 standard bore & stroke, C grind cam, single downpipe exhaust, M40 transmission, and Dana 27 4.10 rear end. This configuration produces 26-28MPG.

Professional head porting is not in the budget for this repair. Bigger and better things are planned for the distant future. Right now I just need to get the spare head ready to swap out when there is no more adjustment available on the current head. Should I do anything to the runners or bowls? I think port velocity is more important than outright flow so I am loathe to do much here.

What is the depth from the piston top to the top of the first ring on the B18 piston? I need this information to calculate SCR. I can measure the other variables.
What SCR should I shoot for?
What quench clearance should I set?
Should I spring for the double down manifold and the associated exhaust? If so, what needles for the carbs?
--
Mr. Shannon DeWolfe -- (I've taken to using Mr. because my name tends to mislead folks on the WWW. I am a 51 year old fat man ;-) -- KD5QBL






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