[DeTomaso] Mysterious ‘China-wall’ gap

[jderyke at aol.com]

Larry, some tuners open up the front 'china wall' on 351-Cs for better drainback of oil held in the tappet chamber. Stock drainbacks are small ('69 & a few '70 blocks had 2 extra drainback holes drilled in the rear but most did not). This also functions as extra lube cascading over the timing chain and maybe the distributor drive gears. The modified opening is sometimes carefully dressed out and sometimes just done with a punch & hammer. Most blocks don't seem to care either way.
My best guess without a photo- J DeRyke


-----Original Message-----

From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
Larry Finch via DeTomaso <detomaso at server.detomasolist.com>
Sent: Tuesday, May 29, 2018 10:23 AM
To: Email List Address For Posting
Subject: [DeTomaso] Mysterious `China-wall' gap

All,
I checked on the assembly of my 404 stroker Cleveland last week, and
there is an assembly issue that neither me, my builder or others I have
spoken with can explain.
The block is an iron four bolt version bored 10-over. The heads are
new, out of the box CHI 4V aluminum and the intake is a new, out of the
box blue thunder Pantera version.
Both the front and rear China-wall gaps, between the block and the
intake, are approximately 1/4 inch wide, perhaps even a little bit
more.
All the intake manifold bolts dropped into their respective threaded
holes slick as butter.

Assembly of the manifold used the cork gaskets and additional RTV to
completely close the gap.
No one seems to have an explanation as to why this gap is so large.
Has anyone ever come across something similar, or have any input that
might explain this?
As always, thanks,
Larry

Sent from me using a magic, handheld electronic gizmo.
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-------------- next part --------------
   Larry, some tuners open up the front 'china wall' on 351-Cs for better
   drainback of oil held in the tappet chamber. Stock drainbacks are small
   ('69 & a few '70 blocks had 2 extra drainback holes drilled in the rear
   but most did not). This also functions as extra lube cascading over the
   timing chain and maybe the distributor drive gears. The modified
   opening is sometimes carefully dressed out and sometimes just done with
   a punch & hammer. Most blocks don't seem to care either way.
   My best guess without a photo- J DeRyke
   -----Original Message-----
   From: DeTomaso <detomaso-[1]bounces at server.detomasolist.com> on behalf
   of
   Larry Finch via DeTomaso <[2]detomaso at server.detomasolist.com>
   Sent: Tuesday, May 29, 2018 10:23 AM
   To: Email List Address For Posting
   Subject: [DeTomaso] Mysterious `China-wall' gap
   All,
   I checked on the assembly of my 404 stroker Cleveland last week, and
   there is an assembly issue that neither me, my builder or others I have
   spoken with can explain.
   The block is an iron four bolt version bored 10-over. The heads are
   new, out of the box CHI 4V aluminum and the intake is a new, out of the
   box blue thunder Pantera version.
   Both the front and rear China-wall gaps, between the block and the
   intake, are approximately 1/4 inch wide, perhaps even a little bit
   more.
   All the intake manifold bolts dropped into their respective threaded
   holes slick as butter.
   Assembly of the manifold used the cork gaskets and additional RTV to
   completely close the gap.
   No one seems to have an explanation as to why this gap is so large.
   Has anyone ever come across something similar, or have any input that
   might explain this?
   As always, thanks,
   Larry
   Sent from me using a magic, handheld electronic gizmo.
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
   DeTomaso mailing list
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   message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
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   References
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References

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