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Old 06-22-2010, 02:10 PM
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Originally Posted by ericnova72
First step, you need to get the initial timing up to around 15-20 initial. You are going to have to modify the distributors advance limit slot under the mechanical advance mechanism due to the fact that you need to keep the total below 40.

Common mod for those of use that do performance on a regular basis, but it sure does seem to throw people a curve ball when you tell them they will have to dissassemble the distributor and modify it, that there isn't some bolt-on solution.
could buy a digital distributor or buy one with an adjustable timing curve.

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Old 08-02-2010, 12:55 PM
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Originally Posted by 454C10
could buy a digital distributor or buy one with an adjustable timing curve.
e-curve ftw
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Old 08-02-2010, 06:17 PM
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Originally Posted by 2000jack
I believe it is 25 so that it has a total of 33, not a total of 40 with the old style heads. I bought the motor as a new rebuilt from Phoenix Engine. I have the cam specsIntake 442 @288 and the exhaust 465 @298. Also they gave me @.50 lift 214 int. and 224 exhaust. Standard flat top pistons. 8 inch Ford rear with 2.92 gears. Standard HEI distributor.
Not sure what intake you have, most likely won't be spread bore but edelbrock makes one for the vortec heads, if mileage is the driving thing here then get yourself a good Qjet carb, new intake and run on those mini primary's with a vacuum gage in the car, keep it above 10"hg at all times (let me know how that goes)...no fun but you may get your 10 mpg and then some Really though one of the most common points here is the ignition timing setup with a performance cam, do these HEI mods and raise that base timing and re-curve the mech, limit the vacuum advance as noted in 500+ threads on here, it works!
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Old 08-03-2010, 04:36 AM
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Well I not sure why. The first time refill I put in gas it was just under 10 mpg. I am on my 2nd time of putting in gas and it got about 12 mpg. What I did not mention originally mention is that the car sat all last year. Maybe it needed to be run. I may yet change the carb.
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Old 08-03-2010, 09:03 AM
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It is not unreasonable to expect 20 mpg on highway and 15 in town. Get a good vacumn guage and jet her down till it won,t go any lower and go small on the cam. If you are not racing this thing then the cam can be tiny and still pull good. Get an o/d transmission and gear the car for o/d cruising in the middle of your highest vacumn at 60 mph. 8 mpg is ridiculous.LOL
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Old 08-03-2010, 12:33 PM
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Hei has 20 degrees advance built into it. Try 16 degrees initial. That will give you 36 total. If it pings a bit, lessen the initial to 14 degrees. Run full manifold vacuum to the advance can on distributor.

Do you have a functioning choke? No hang ups anywhere?

Why are you guys calling that a big cam? 214 and 224 duration @ .050 lift. Thats around Comp Cams XE 262 which is NOT a big cam, can use stock stall converter with that cam.

I missed it or OP didn't say, what transmission?

More initial timing is going to solve this. By the way, how heavy is your foot?
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