need help with budget heads

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Jan 26, 2013 | 02:25 PM

buddhaz06

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need help with budget heads

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?

Feb 3, 2013 | 12:55 PM

buddhaz06

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Can anyone chime in?

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

Feb 3, 2013 | 01:40 PM

garygnu

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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.

Feb 3, 2013 | 01:41 PM

mvrotc

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

Feb 3, 2013 | 01:42 PM

mvrotc

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

Feb 3, 2013 | 01:43 PM

Tainted

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

Feb 3, 2013 | 03:04 PM

buddhaz06

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Quote:

Originally Posted by mvrotc

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

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.