Have a cammed ls6. Its 638/624, 237/240 on a 111lsa iirc. I was wondering if 243's would be okay for a cam only setup or if some worked 5.3 heads would be better. 5.3 with the smaller Chamber hurt ptv clearance at all?

 

Can anyone chime in?

I can afford 1-7/8 headers only or get 1-3/4 and get some stock 243's

 

you can sink the valves deeper into the valve seat with the 5.3 head to gain some PTV .you will need to measure for correct length push rods.

 

How do u have a cammed ls6 and not already have 243s lol that's what comes on an ls6

 

And Ps 243s outflow the 5.3s the bigger valves help out a ton

 

Id get the ls6 heads, you can mill according to ptv for maximum compression.

 

Long story short. Sold my stock ones when i put big heads on it. Sold the big heads to a buddy, now I'm hunting again. I can have 5.3 heads gone through(ported) for about $500+ parts. 243's are around 400 shipped plus springs. Then any additional porting and milling.

 

5.3 with ls1 valves help alot?

 

Since the 5.3 route is cheaper for you go with it. There wouldnt be a huge difference between them and the 243/799

 

Okay thanks for suggestion! 862? 706?

 

Cant help ya on those castings, check TSPs website and see what cores they use or TEA AI