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HOT-ROD
12-16-2002, 06:16 PM
does that make it a 416 ?
12-16-2002, 07:07 PM
ask beerock, he's good at that stuff
Sparks425Ex
12-16-2002, 07:09 PM
.40 over=406
.80 over=416
.120 over= 426(I think) or maybe it is .100 over. Not sure on the last one.
DGR Designs
12-16-2002, 07:50 PM
yup what he said /|\
i |
RideRed04
12-16-2002, 07:55 PM
Originally posted by NACS425Ex
.40 over=406
.80 over=416
.120 over= 426(I think) or maybe it is .100 over. Not sure on the last one.

Wait, so I bore less to get a 426? Might wanna check your math. I thought .2 was a 406, .4 was a 416 .6 was a 426 and .8 was a 440. I'll have to do the math if no one posts.
RideRed04
12-16-2002, 08:08 PM
Ok, here are the real values

stock (85mm piston)=397cc
.04 over (86mm)=407cc
.08 over (87mm)=416cc
.12 over (88mm)=426cc
.16 over (89mm)=435cc
.2 over (90mm)=445cc
frogburner
12-16-2002, 08:15 PM
will OEM gaskets work with the 416 and 406 kits with 11:1 compression pistons??
RideRed04
12-16-2002, 08:17 PM
Most of the compression ratios are set up for the xr400, which has a thinner head gasket. They will work, the compression would just be lower.