RebelExtrm02

iTrader: (3)

One of my options for finishing my budget build is to stick with my current cam and mill down a pair of 243 heads with stock 2.00 and 1.55 valves to raise compression. My cam specs are as follows:

227/235 .614”/.621” 113LSA +2 advance (with 1.7 ratio rockers)
Comp LSL/LSL lobes 54-000-11 cam core
13017R/13019R HR113LSA +2 advance (111 installed intake centerline)

Cam Valve Events 0.006 0.050 0.200
Intake Duration - ID 277 227 151 13017R LSL lobe .614"
Exhaust Duration - ED 285 235 158 13019R LSL lobe .621"
Lobe Center Angle - LSA 113 113 113
Intake Centerline - ICL 111 111 111

Intake Valve opens - IVO 27.5 2.5 -35.5 BTDC (- indicates ATDC)
Intake Valve closes - IVC 69.5 44.5 6.5 ABDC
Exhaust Valve Opens - EVO 77.5 52.5 14 BBDC
Exhaust Valve Closes - EVC 27.5 2.5 -36 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 115 115 115
Overlap 55 5 -71.5 degrees

One suggestion was to mill the heads .015 to a 62cc chamber and use a .040 head gasket to get a SCR around 11.3 and DCR of 8.6 (tuning for pump 91). I'm actually leaning toward milling the heads more and using a stock head gasket due to cost and convenience (understandably at the expense of quench).

Either way, to stay on track, does anyone foresee any piston to valve issues using this setup without fly cutting the pistons. I'm going to measure before installing regardless but it would be nice to know if the odds are against me.

PREDATOR-Z

Once you mill you SHOULD measure. The way I've always done it is to measure with gaskets and heads unmilled, see PTV values and based on those results decide how much to mill and get it done.
No guesswork, just facts.

RebelExtrm02

iTrader: (3)

I can't believe that never occurred to me. Heh. I guess the obvious isn't always so obvious.