[DeTomaso] Valve train

[Tony DiGiovanna]

Confirm that you do not have the moroso oil restrictor kit installed in the
bottom end of the block.  Its not supposed to be compatible with hydraulic
lifters, flat or roller.  Opinions vary.  Also, confirm the lifters aren't
rising high enough in their bores to lose oil pressure in the lifter supply
circuit.

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of JDeRyke at aol.com
Sent: Monday, March 21, 2011 12:04 AM
To: gaino at earthlink.net; detomaso at realbig.com
Subject: Re: [DeTomaso] Valve train

In a message dated 3/20/11 5:44:13 PM, gaino at earthlink.net writes:
snip.....
> Then a push rod came out from under a rocker, or off a lifter.  No 
> damage, I put it back...  what gives... ? not enough spring pressure?  I
have a 
> 6000 rpm limit,, never hit it.. Ideas. should I be able to hear the valve 
> train workin?
> 
When setting valve lash or hydraulic lifter preload, its possible to hang a 
pushrod tip on the top outer edge of a lifter, and adjust everything there. 
Then under load, it pops off- sometimes out, sometimes into its socket 
where it rattles around from too much clearance. I personally adjust both
solid 
and hydraulic lifters old-school- with the engine running at idle. Its 
painful and messy to do this way, but you get to see and touch the valves & 
pushrods while they're working, and a hung pushrod will be immediately
obvious 
from it's different rocker angle in operation. You got lucky if nothing was 
damaged. Go buy yourself a lottery ticket.... 
Whether the valvetrain is noisy or not depends a bit on the cam & its type. 
My fast-bleed hydraulic flat-tappet lifters are as noisy as some solids at 
idle. 
Your problem may also have been a broken or missing inner valve spring or 
damper (if you're using such). The inners & flat dampers are difficult to
see 
fully assembled, especially if you're running a stud girdle (desirable on 
351-Cs). Use the paper-clip checking method on that particular spring set to

detect a defective spring by poking it and looking for any motion. A normal 
human will not be able to move anything by hand in a spring-set unless its 
busted. I'd disassemble that spring-set clear down to the head if you have 
further trouble with that valve. All this can be done with difficulty & the 
right tools with the engine in the car. Good luck- J Deryke
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