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boostat4500 · 08-14-2008, 03:30 PM

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.

08-14-2008, 03:30 PM	#37
boostat4500 Registered User Join Date: Aug 2006 Location: Reno, NV Posts: 346	Re: 5.3 or 6.0 in my 1970? 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. __________________ 1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc.