[DeTomaso] Mysterious ‘China-wall’ gap
jderyke at aol.com
jderyke at aol.com
Tue May 29 16:19:31 EDT 2018
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.
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