Re: briggs timing...firing before tdc??
Don't touch the eyebrows on that block. On some blocks the deck height is significantly taller than the valve seats and it's a good mod, but on that one if you do even a little bit of grinding you risk getting a loose valve seat.
Here's the high comp head it's shaved somewhere between .025 and .030", this head with 6* timing advanced and a port/polish job of smoothing the exhaust threads and corners and rounding the inside corner of the intake will make the engine quite a bit more powerful. I have a mag also but you'd need to figure a way to put the plug wire in cause I cut it off to use on my new motor. Head could use some wire brushing in the valve pockets and maybe a good sandblasting on the fins (a couple fins missing)
Last edited by Tony01; 01-05-2017 at 02:37 AM.