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Author Topic:   Yates/Cleveland
Fordwiser
Gearhead

Posts: 442
From: Metamora, Illinois
Registered: Dec 2000

posted 06-19-2002 07:45 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
Why is it that most everyone who sells Yates pistons insist they will fit Clevelands, is it that hard to get rid of used Nascar stuff they have to lie and say they fit when they don't or don't they know? Maybe it's because the valve covers fit! LOL!
Roger

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 06-20-2002 09:33 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
These heads have or had, not sure if they still do, the same compound valve angle as the cleveland heads.

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Mpcoluv
Gearhead

Posts: 1341
From: Charlotte NC usa
Registered: Apr 2001

posted 06-20-2002 09:57 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
The Yates heads DO NOT have the valves in the same place as a cleveland. The heads also have little to no side cant, and the valves are commonly 2.100 to 2.15 on the intake and 1.65 on the exhaust.
The SVO heads produced prior to the yates (A3, B351, C302, etc...) Have the stock cleveland valve location and side cant.
Dan Jones has all the scoop on the early heads.
If you notice that a clev. piston will have the intake valve notch that creates a notch on the outer perimeter of the piston. All the yates pistons I have seen do not have the intake valve notch right at the pistons edge like a cleveland.
If you have a mild cam, the yates pistons might work but I doubt it.

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MASTIFF
Gearhead

Posts: 101
From: maumee, Ohio 43537
Registered: May 2001

posted 06-20-2002 11:39 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
The Yates family of cylinder heads were originally introduced to contend
with restrictor plate rules. The valve angles were changed (to 7.5 and
8.0 degrees with no side cant) to reduce piston valve relief depths and
permit higher ring packaging. Also, the combustion chamber shape was
revised for very high compression levels. The resulting head requires a
custom aftermarket rockershaft system, different pistons, valves, and
pushrods. The ports were also made small to allow custom porting and
require extensive porting to produce the desired flow numbers.

When considering Yates heads, keep in mind the valve gear required to
finish the heads is very expensive. The custom Jessel rockershafts
and arms cost nearly as much as the bare heads. Out-the-door costs are
typically $4K+. The A3/B351/C302 heads are nicer in this regard since
they were designed to take standard, inexpensive, 4V parts.

Also, the small Yates combustion chambers (40 cc's) and are designed to
operate with custom pistons that are dished with a mirror image of the
combustion chamber. You can get Yates heads in a larger combustion
chamber size but the extra power they provide over the earlier
A3/B351/C302 heads is mainly in the chamber/piston design. Some racers
maintain the earlier SVO heads are still superior to the Yates (at least
the early versions) in non-restrictor plate applications.

Like the high port family, there are a variety of Yates heads (see
table below). The C3 and C3L will accept most Ford Motorsport Yates
intake manifolds and have the same raised exhaust port location.
The C3H Yates is has a higher intake port that requires a specific
intake manifold (available from FRPP and Edelbrock). Notes and variations
are listed below.

Yates SVO High Port Canted Valve Aluminum Cylinder Heads
--------------------------------------------------------

Part CC's Int Exh Int Exh Description
Number Port Port Vlv Vlv
Vol Vol Dia Dia
CC's CC's In In

M-6049-C3 40.0 210 119 2.1 1.6 high compression
M-6049-C3L 67.0 210 119 2.1 1.6 low compression
M-6049-C34 48.0 228 131 2.1 1.6 CNC ported and
Extrude-honed
M-6049-C34 48.0 221 131 2.1 1.6 same as C33 except
smaller intake port
M-6049-C35 67.0 210 119 2.1 1.6 Same as C3L but without
seats, guides, or
pushrod holes
M-6049-C3H 40.0 2.1 1.6 Allows for taller intake
intake port.

Yates Head Notes:
----------------

1. Require aftermarket shaft mounted rocker arm system
2. Staggered valves at 7.5 and 8.0 degree angles with no side cant
to reduce piston valve relief depths and permit higher ring package
3. Revised combustion chamber shape for higher compression
4. Phosporous bronze valve guides
5. Motorcraft AG-series spark plug
6. The C3H version is listed as a "High Port Yates" and has higher intake
ports requiring M-9424-W352 intake manifold and 5.45" long intake and
5.26" long exhaust valves. the intake manifold bolts perpendicular to
the cylinder head. Uses same rockershaft as C3L but requires longer
pushrods. Exhaust port is same as C3L.

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Daniel Jones
Gearhead

Posts: 898
From: St. Louis, MO
Registered: Aug 99

posted 06-21-2002 04:56 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
>The Yates family of cylinder heads were originally introduced to contend
>with restrictor plate rules. The valve angles were changed (to 7.5 and
>8.0 degrees with no side cant) to reduce piston valve relief depths and
>permit higher ring packaging.

Gee, when you post someone else's work, the least you could do
is credit me :-)

Dan Jones

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MASTIFF
Gearhead

Posts: 101
From: maumee, Ohio 43537
Registered: May 2001

posted 06-21-2002 10:37 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
Your Right, Sorry

All the Yates information I posted is thanks to Dan Jones' reasearch.
Some times it is just to easy to cut and paste.

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