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Re: 5.3 or 6.0 in my 1970?
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Originally Posted by boostat4500
Yes I switched the gears after the tires. The motor was just lugging too much with the 4.10's. Now I'm about 2400rpm at 70mph and the motor is hardley working, it's great.
As far as a cam, you can go as big as you want. "Good street manners" is a relative term. My truck now has a .551"/.551" 210/218 114lsa cam and it drives great. Little bit of a lope, but not much. Some people think it's too lopey. I'd actually like to go a little bigger. My last Trans am had a .595/.605, 234/240 114lsa cam and it was perfectley streetable too, in my opinion. It's all a matter of opinion. Your limiting factors are going to be valve springs ( stock are only good to about .500 lift ), and needing a higher stall converter if you go real big on the cam.
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Do you have 1 ton running gear? If I go over 70 mpg my mileage REALLY falls off, between 70-75 I only get a little over 11mpg.
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1972 K/5 4x4, Radixed LS1 6.0, 428HP/445TQ, Lingenfelter GT2-3 cam, WCCH 90mm J-Tube, LS2 90mm TB, Stainless Works Headers, NV4500, 4.56 gears, Detroit Lockers, 14 bolt FF, Dana 60, 4 wheel disk Hydro Brakes, dual electric fans, Autometer guages, 4" lift, Zero Rates, Weld Evo Velocity XT8 wheels, 35x12.5x17 Super Swamper SSR's.....
http://s72.photobucket.com/albums/i1...tos/?start=all
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