perf-list-digest Tuesday, October 27 1998 Volume 01 : Number 129



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Ford Truck Enthusiasts - Performance
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In this issue:

FTE Perf - Toughy
FTE Perf - Toughy

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Date: Mon, 26 Oct 1998 18:49:34 EST
From: JUMPINFORD aol.com
Subject: FTE Perf - Toughy

This is for all you Smarties :-)

About 10 years ago my dads 429 was rebuilt, and the machine shop decked the
block for more compression. He also ground the intake manifold to match.
Well, a few years later, we replaces the manifold and have a vacuum leak ever
since. My question is if anyone knows a way to tell how much to machine the
new manifold so it all fits tight again. Any help is appreciated.

Darrell Duggan
74 F-350 "Tweety"
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Date: Mon, 26 Oct 1998 18:23:42 -0800
From: George
Subject: FTE Perf - Toughy

What's the deck height now, after the machine shop decked it 'for more
compression'? Why they decked a 429 is strange. The early 429 10.297 deck
blocks and 75.8cc heads were so plentiful ten years ago they were being
sold for scrap. Most people were trying to reduce compression. Maybe he has
a lot of Avgas and it's powering a truly awesome machine. Maybe the machine
shop had a new piece of equipment and...Sorry, that's just curious me
mumbling out loud.

A common vacuum leak in the 385 series when the intake manifold is replaced
is at the front and/or back corners of the manifold. Many intake manifold
gasket sets contain two cork or rubber gaskets for those areas, in addition
to the two intake port gaskets. Those end pieces are easy to mis-align when
setting the manifold on the heads. Instead of using those end pieces, I use
a liberal bead of silicon sealer to eliminate those possibilities.

I'd try that before I went to the trouble and expense of blueprinting the
manifold to the heads. If that doesn't solve it or you want to blueprint
it, please post the deck height and type of manifold.

George Miller

This is for all you Smarties :-)

About 10 years ago my dads 429 was rebuilt, and the machine shop decked the
block for more compression. He also ground the intake manifold to match.
Well, a few years later, we replaces the manifold and have a vacuum leak
ever
since. My question is if anyone knows a way to tell how much to machine
the
new manifold so it all fits tight again. Any help is appreciated.

Darrell Duggan
74 F-350 "Tweety"




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End of perf-list-digest V1 #129
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