Hey I have a 1970 Chevelle LS6 with a 4 speed that was given to me by my father. Its completely stock except for it has headers that he installed on it about 30 years ago. The car has 40,000 miles on it and runs great. I wanted to give it alittle more speed without ruining the car. What would you recommend? Exhaust? New headers? Specific cam? New manifold? Other parts im not thinking of? I would prefer to do a cam that wont require me to change the carb. Just looking for something street friendly. Would like the car to run low 12s high 11s on slicks if possible for what im looking at. I am quite familar with EFI chevys but dont know much about carbed chevys. Any help you guys could offer would greatly be appreciated. Also I plan on keep the stock parts no point on ruining a almost stock car for good.

I know you asked about modding this car, but I wouldn't. If its a real LS6, its just too valuable as is. JMO smile.gif

I kinda agree about leaving an LS-6 alone,
but a modern camshaft wouldn't show,
and would probably make the biggest performance gain.

Whatever you do, SAVE any original parts you remove. That said and if you're bent on tweaking it, a peformance distributor recurve with Pertronix 1181 trigger in the stock dist and MSD 6 AL box hidden behind the battery will give you all the firepower you need and provide a rev limiter (very important with a manual trans and solid lifter engine). Then a Flowmaster American Thunder 2 1/2" exhaust system with Dynomax Hemi Super Turbo mufflers added to your headers will give a free flowing yet relatively quiet exhaust. A little tuning on the stock Holley carb might help too. If you still need more after that, a modern solid lifter cam design would help too. The UD 272/272, 112 LSA idles like the stock LS-6 cam but gives noticably more power over the entire rpm range. Be sure to save the orig cam and label the lifters so they can go back in the exact same location if desired.

I just talked to my dad and he said way back in 72 he converted the car over the hydralic lifters but he doenst remember exactly why. Is there a kit I can by to convert it back to solid roller?

All you would need is a flat tappet cam and a set of solid lifters, plus gaskets etc. The cam isnt a solid roller, just an old school solid lifter cam!