[DeTomaso] Ebay 351 C Oil Addition line for Main #4 and #5

[Will Kooiman]

What about Michael Frazier's failure at BBORR this year?  His camshaft broke
between the last 2 journals.  Would the external line have made a
difference?  Probably not, but it's a thought.

I drilled my block to 3/8" (the passage from the sending unit to the cam)
and ran a -8 external oil line.  I was considering drilling the pipe threads
out to a larger size, but I left them alone.

My reasoning is that

a)  There is little harm to the external line.  It doesn't come close to the
headers.  I ran it down the middle of the intake.  It is a "soft" line -
braided a/n - so it can't crack.

b)  Adding a line downstream could increase pressure to #1 and #2.  The
external line should equalize pressure, which is what we want.

And yes, it probably isn't necessary, but it probably doesn't hurt either.

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of JDeRyke at aol.com
Sent: Sunday, August 02, 2009 12:12 AM
To: claywillmott at hotmail.com; detomaso at realbig.com
Subject: Re: [DeTomaso] Ebay 351 C Oil Addition line for Main #4 and #5

This idea, like mothballs in the gas tank, keeps coming back every few 
years. The idea came from drag racing 35 yrs ago, but the conditions were so

different that not many of their innovations are applicable to today's
reality. 
Since many 351-C rod failures seem to be in cylinders 1 & 2, it seems 
counter-productive to me to pull oil away. IMHO, detonation from high speed
fuel 
lean-out, or valve float are the real culprits, not lack of oil. If you do 
this, clamp the lines against the block at least every 8", keep them as far 
away from the headers as possible and make the external line at least
dash-4. 
Since the hole down thru the rear of the block is only 0.290" dia once you 
drop below the 1/4" pipe thread used for the oil gauge sender, the volume of

oil delivered won't be more than dash-4 can carry unless you bore the hole 
bigger clear down to #5 main. Some of the more successful drag guys used 
external stainless steel hard lines, not ss flex lines. I'd suggest sticking

with oil restrictors, a standard pump and a really good set of rods, valves 
and full roller rockers. Aluminum heads will help reliability, too.   Good 
luck- J Deryke


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