[DeTomaso] Building a Sleeper

Daniel C Jones daniel.c.jones2 at gmail.com
Thu Jan 5 16:46:33 EST 2017


> I really liked how it fit beneath the L engine screen cover

We've done it several ways, typically on 393C or 408C strokers though it
can be done on stock displacement engines if you want to spin them to a
higher RPM (gives up some manners for a street car).  One was using the
over-the-counter Holley carb pattern aluminum Ford dual plane intake on a
408C with closed chamber iron 4V heads with hydraulic roller camshaft.
Note the Ford intake had four good runners and 4 bad runners so spent some
time on the flow bench bringing the bad runners up to match the good.
Another way is with Scott Cook's aluminum dual plane which is a dead ringer
for a Ford Cleveland dual plane, right down to the Ford logo and casting
codes.  It works with Scott's own heads, Ford iron 4V heads, CHI 4V or Ford
Motorsport A3 heads.  On my 403C, we made 569 HP and 512 ft-lbs through the
mufflers with Scott's dual plane and a pair of unported A3 heads with a
street-friendly hydraulic roller cam.  It can also be done with the TFS-2V
heads and a Holley Street Dominator 2V (OEM for the smog legal Amerisport
Panteras).  The level carb pad version of the Blue Thunder will also work
with some minor porting.  The 408C we did for Mike Drew's made over 525+ HP
with a Blue Thunder and CHI 4V heads.  The Blue Thunder intake manifold is
just about the limit that will fit under an L engine screen with a drop
base air cleaner.  Mike McDougal's 393C with CHI 4V heads and ported flat
pad Blue Thunder (doesn't fit under his pre-L engine screen) put down well
over 400 RWHP through somewhat restrictive mufflers.  At these sort of
horsepower levels, the mufflers are very important.  You'll lose 50+ HP
through stock ANSA mufflers.

For reference, here are some A/B measurements I made.  The measurements
represent the drop from a straight edge laid across the carb pad to the
closest point where the end rail bends inward (each end).  Measurements are
in inches.

Ford aluminum 4V........................3 1/4.....4 3/8
Offenhauser 360 4V......................3 1/2.....4 1/2
Edelbrock F-351 & Performer 2V/4V.......3 1/2.....4 3/8
Weiand Xcelerator 2V....................4 3/16....5 1/8
Holley Strip Dominator..................4 5/16....5 3/8
Blue Thunder (canted pad version).......4 7/16....5 3/8
Scott Cook (canted pad version).........3 3/4.....5
Edelbrock Performer RPM Air Gap 2V......4 1/2.....5 5/8
Weiand tunnel Ram.......................9 1/16....9 3/8
A331 (raised floor Edelbrock Torker)....4 3/8.....5 5/16
A351....................................6 3/4.....6 3/4

Dan Jones
-------------- next part --------------
   > I really liked how it fit beneath the L engine screen cover
   We've done it several ways, typically on 393C or 408C strokers though
   it can be done on stock displacement engines if you want to spin them
   to a higher RPM (gives up some manners for a street car).A  One was
   using the over-the-counter Holley carb pattern aluminum Ford dual plane
   intake on a 408C with closed chamber iron 4V heads with hydraulic
   roller camshaft.A  Note the Ford intake had four good runners and 4 bad
   runners so spent some time on the flow bench bringing the bad runners
   up to match the good.A  Another way is with Scott Cook's aluminum dual
   plane which is a dead ringer for a Ford Cleveland dual plane, right
   down to the Ford logo and casting codes.A  It works with Scott's own
   heads, Ford iron 4V heads, CHI 4V or Ford Motorsport A3 heads.A  On my
   403C, we made 569 HP and 512 ft-lbs through the mufflers with Scott's
   dual plane and a pair of unported A3 heads with a street-friendly
   hydraulic roller cam.A  It can also be done with the TFS-2V heads and a
   Holley Street Dominator 2V (OEM for the smog legal Amerisport
   Panteras).A  The level carb pad version of the Blue Thunder will also
   work with some minor porting.A  The 408C we did for Mike Drew's made
   over 525+ HP with a Blue Thunder and CHI 4V heads.A  The Blue Thunder
   intake manifold is just about the limit that will fit under an L engine
   screen with a drop base air cleaner.A  Mike McDougal's 393C with CHI 4V
   heads and ported flat pad Blue Thunder (doesn't fit under his pre-L
   engine screen) put down well over 400 RWHP through somewhat restrictive
   mufflers.A  At these sort of horsepower levels, the mufflers are very
   important.A  You'll lose 50+ HP through stock ANSA mufflers.A
   For reference, here are some A/B measurements I made.A  The
   measurements represent the drop from a straight edge laid across the
   carb pad to the closest point where the end rail bends inward (each
   end).A  Measurements are in inches.
   Ford aluminum 4V........................3 1/4.....4 3/8
   Offenhauser 360 4V......................3 1/2.....4 1/2
   Edelbrock F-351 & Performer 2V/4V.......3 1/2.....4 3/8
   Weiand Xcelerator 2V....................4 3/16....5 1/8
   Holley Strip Dominator..................4 5/16....5 3/8
   Blue Thunder (canted pad version).......4 7/16....5 3/8
   Scott Cook (canted pad version).........3 3/4.....5
   Edelbrock Performer RPM Air Gap 2V......4 1/2.....5 5/8
   Weiand tunnel Ram.......................9 1/16....9 3/8
   A331 (raised floor Edelbrock Torker)....4 3/8.....5 5/16
   A351....................................6 3/4.....6 3/4
   Dan Jones


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