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6.2 l9h cam swap = cam dowel pin broke

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Old 05-31-2020, 06:54 PM
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Default 6.2 l9h cam swap = cam dowel pin broke

I finished up my vvt cam swap and on the first crank or when I torqued the cam bolt down, the cam dowel pin broke either way and bent 8 exhaust pushrods and all 8 exhaust valves.

Specs are:
Custom Pat G Cam
Comp torrington rocker bearing upgrade
Comp Hi Tech 7.4" Pushrods
VVT limiter cam Gear
BTR Valve Springs and Retainers to match the .600 lift.

I am sad...motor is out and at the machine shop now. Looking for suggestions for "while your in there" upgrades. Silica filled Exhaust Valves - are those an thing or option? Stock style pistons that don't slap as much on initial warm up?
Old 06-01-2020, 11:20 PM
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Sodium Filled not Silica.

Pistons you could try new replacements otherwise you would have to have it bored to get a tight clearance.
Old 07-09-2020, 02:18 PM
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Since I had my problem at such a low rpm, All I bent was the pushrods. Replaced those and lapped the valves. Drilled out the cam pin, replaced it and reinstalled. All is good again. Working on the tune now.
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