Anyone know how far AFR 195 LT4 heads can be milled?
05-18-2010, 07:50 PM
#1
Anyone know how far AFR 195 LT4 heads can be milled? Looking at a set of AFR 195 LT4 heads, and am building an E85 stock shortblock engine, so I need the most compression that I can get. Anyone know how far these heads can be safely milled down?
05-18-2010, 10:25 PM
#3
The most you are recommended to flat mill an SBC head is around .050, a bit over ~8ccs.
Angle milling can go farther, but is also more expensive and needs the intake to be done as well to match up.
Shouldn't have to say it, but be sure to measure pushrod length and check PTV carefully with heavily milled heads and big duration cams. Its not so much the lift that causes issues, but hanging the valves open for longer.
BTW, the spec sheet on AFRs show the maximum mill amount, and how much material equals 1 cc on each of their heads.
Angle milling can go farther, but is also more expensive and needs the intake to be done as well to match up.
Shouldn't have to say it, but be sure to measure pushrod length and check PTV carefully with heavily milled heads and big duration cams. Its not so much the lift that causes issues, but hanging the valves open for longer.
BTW, the spec sheet on AFRs show the maximum mill amount, and how much material equals 1 cc on each of their heads.
05-19-2010, 07:16 AM
#6
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