[427/C5R build update....]

I guess you're not worried about breaking it in.

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Breaking engines in is for people that don't set correct tolerances....

 

Top Fuel engines get a good break in, tear-down and assembled in 75 minutes

and a couple of throttle whips, then right on the track...

 

[427/C5R build update....]

Check that rocker are to retainer clearance since you couldnt do it on the engine stand..

nothing like some stray aluminum in the pan...

[427/C5R build update....]

Yea, good stuff costs... my 427 i had (back in the day) had Manley severe duty Stainless exhausts and Ti- Intakes and buzzed 8-8200 and never had a valve failure.. with aluminum rods and .085 in/valve clearance..

 

(oh, and GOOD valve springs)

[427/C5R build update....]

What would cause valve stems to mushroom?  A hammer?

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usually this only happens under valve float or when a rocker arm fails.

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OR, cheap valves, too much seat pressure...?

now its time for lash caps!!!

I dont know about these newer motors..

But the lash cap or bad a$$ manley valves fixed that problem on old SBC heads