Easy "fix" for starter kick-back

67Dart273 said

I think you have other problems. No engine should kick back at only 10 initial

Check the balancer with a piston stop to be sure your marks are even accurate

There has been some posts on the www indicating timing light problems with MSD, if that's what you are using, so your timing might not be where you think it is.

Otherwise, not enough battery, something wrong with the flywheel, bad starter, etc

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I assembled the engine myself with a new Summit SFI damper barely 3 years ago and the timing marks were spot-on. I am using a multi-spark box but it's made by Mallory not MSD, I am aware of issues with those and the dial-back timing lights and mine is a regular one; I don't need a dial-back light as the damper has timing marks all the way up to 60* BTDC. I also know the parts you mentioned are all good I am using a mini-starter which cranks super fast; I do need a new battery but this was happening even when I had a full charge. It would kick back before the engine even had a chance to turn over once, literally almost instantly after I would turn the key to crank the engine.

I even Sea-Foam'd the engine (twice) to remove carbon which I thought was causing hot spots and preignition but that made no difference. Something I do notice now when I crank the engine hot with no spark it "sputters" a bit like the fuel-air mixture is igniting itself solely from compression and heat... My combo is a little "unusual" I have a 360 bored .060" over with KB flat-tops and factory iron Magnum heads (with factory 1.6:1 rockers), true static compression was verified during assembly at 10.42:1 and like I said the cam is very small for the cubes/compression this engine makes MONSTER torque on the bottom end and runs perfect aside from the starter kick-back I had before I did this ignition mod.