[DeTomaso] DAN JONES YOUR INPUT REQUESTED

[Daniel C Jones]

I'm tied up this evening but should be home tomorrow night.  Home
phone is 314-838-1298 (better connection than my cell).  Dan

On Tue, Jan 7, 2014 at 10:50 AM, clewis at dmn.net <clewis at dmn.net> wrote:
> Dan when are you available for a phone discussion?
>
> Last year middle of the season a beehive spring broke and dropped the valve.
>
> I am ready to rebuild but have a number of things I would like your input on.
>
> The springs were PAC Beehive 1220XX. Good for .650 lift. They had started to experience cascading failures. Broke one and replaced
> it and then a second different one failed and dropped the valve.
>
> The actual lift is .665, but a phone call with PAC when the engine was built said this should not be a problem. I spoke with them
> myself as did Jeff Lawrence. Clearly either this was wrong or somehow the engine was over revved.
>
> PAC has provided a full set of replacement springs, the same 1220XX.
>
> I am thinking if I don't change the cam I need to use 1255xx, good for .700 lift or 1295xx good for .750 lift.
>
> I suspect the damage to the bottom end is relatively minor. The valve dropped after the engine had stalled and I was trying to
> restart the engine (clutch was disenganged and there was no weight of a moving car against the drivetrain.
>
> Should I consider titanium intake valves to take weight out and stress out of the valve train?
>
> Will the reduction in weight enable the valve train to have better control?
>
> Will titanium valves with the proper coating be durable in a street application? (Isn't this what the new Corvette uses?)
>
> How would you approach this rebuild to address the obvious and maybe not so obvious issues?
>
> Best Regards, Chris Lewis
>
>
>
>
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