bwyffels

I need help deciding on if I should mill the heads for an ls2 build. One person is telling me if I mill to 61cc from 65cc that the ptv will be ~.068 and I will need valve reliefs. Another shop is telling me ptv will be fine and they definietely recommend milling. Can anyone help me make a more informed choice? Would you mill the heads or possibly just run a thinner gasket? (I am going to be using either TFS as Cast 220, but most likely the 225's): Also, I had this cam specd when I was planning on initially using the stock heads so shouldnt there be more ptv with trickflow heads? Thanks for any help.

Cam details
230/238 .600”/.615” 112LSA +2 advance (with 1.7 ratio rockers)
Comp EPS/LXL lobes 54-000-11 3 bolt cam core
13118R/13161R HR112LSA +2 advance (110 installed intake centerline)

Cam Valve Events 0.006 0.050 0.200
Intake Duration – ID 279 230 151 13118R EPS lobe .600"
Exhaust Duration – ED 290 238 159 13161R LXL lobe .615"
Lobe Center Angle – LSA 112 112 112
Intake Centerline – ICL 110 110 110

Intake Valve opens – IVO 29.5 5 -34.5 BTDC (- indicates ATDC)
Intake Valve closes – IVC 69.5 45 5.5 ABDC
Exhaust Valve Opens – EVO 79 53 13.5 BBDC
Exhaust Valve Closes – EVC 31 5 -34.5 ATDC (- indicates BTDC)
Exhaust Centerline – ECL 114 114 114
Overlap 60.5 10 -69 degrees

NVR_SPDS

iTrader: (39)

The safest bet would be to measure before you mill, and see where your at. then decide from there.. Atleast, thats what i would do.