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stelth2002 · 11-03-2003, 06:40 PM

I would definatly put an HEI in there. I think that might give you 2 mpg max. more. It sounds like you have her tuned pretty good. Make sure your advance is working right. From my experience most of the non 292 trucks had 4.10 gears. Which would explain why you think your floating valves at 60. I've got a 3.73 posi in mine and it works good. Ive had her over a 100 easy and im pretty sure you could turn 75 if you had to. However you will not get milage goin that fast.
I would aviod messin with gears, unless you can swap rears, and id just put an HEI in it and use it.

11-03-2003, 06:40 PM	#6
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	mileage I would definatly put an HEI in there. I think that might give you 2 mpg max. more. It sounds like you have her tuned pretty good. Make sure your advance is working right. From my experience most of the non 292 trucks had 4.10 gears. Which would explain why you think your floating valves at 60. I've got a 3.73 posi in mine and it works good. Ive had her over a 100 easy and im pretty sure you could turn 75 if you had to. However you will not get milage goin that fast. I would aviod messin with gears, unless you can swap rears, and id just put an HEI in it and use it. __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!