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Hot
Rod Blog Engine
As is typical for an Alpha
Male Engineer, I'm starting with the powerplant. Being a long-time
Pantera enthusiast and Ford
man, and having decided my hot rod theme will be "High Tech Road
Racer", I chose to build a 351 Cleveland. I could've gone to one
of the newer, higher tech motors, but frankly, they're a lot more money,
its harder to get parts and information about them, and this a hot rod,
so it owes something to roots and history.
The Cleveland should have
been the alpha dog Ford small block, and for a short while, it reigned
supreme. The canted valve heads almost flowed too much for street use,
and were devasting in the hands of racers. Today's 5 liter Fords owe a
great debt to the Cleveland. Their heads are largely based on Cleveland
technology.
To fit the High Tech Road
Racer theme, my engine needs a number of attributes:
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Road Racer Feel: Rev, rev, rev. Ferraris rev. NASCAR motors rev. Fortunately,
Clevelands rev too, and a lot easier than most Detroit mills. I'll target
a 7,000 rpm shift point with as broad a powerband as possible below 7
grand. It should sound glorious at those rpm's, as well as making a lot
of horsepower. I'm thinking 500 HP is a good goal! Holding up to those
kind of revs means a serious bottom end and valvetrain. We'll need a roller
cam, and we'll have to rely on fuel injection to tame it a bit for the
street.
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Road Racer Look: Road
Racer motors generally have two distinguishing features: velocity stack
injection intakes and curvaceous snake pit exhaust pipes. We gotta capture
both on this here mill. Road Racers also can't look too production. Things
get fabricated for them. Check out the sheet metal valve covers to capture
that aspect. Racers have to be able to work on their motors fast. Oil
fills and radiator fills have to be knurly caps that are machined and
grip well so there is no fumbling.
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High Tech: Billet cosmetics. Cool fasteners like the Wiggins clamps. Fuel
injected. Cold air intake system. 12 point stainless fasteners everywhere.
Keep it clean--no clutter. Smooth all the rough edges and glossy paint
the block parts. We prefer custom bent hard lines to flex lines because
they look high tech and clean it up. You digging this yet?
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The bottom end is
the foundation of any high-horsepower motor, particularly one that
is supposed to rev as well. If it won't hang together, the rest
of the package just doesn't matter. In my case, I was lucky to find
a smoking deal on eBay consisting of the following pieces:
Block: A 351
SVO Yates-style shortblock just like what they use for NASCAR and
other racing classes. Ford Motorsport part number M6010-R351, This
is a siamese-bore block, so there the water passages do not run
between the cylinders, which makes the block a lot stronger. It's
also a block that could be bored out to as much as 4.125".
It's got 4 bolts on all 5 main bearings, again, making it strong.
The bore is 4.087 (bored relative to stock), and the deck is 9.2
inches. This thing has bene professionally prepared, including magnafluxing
(checked for cracks), decked, line hone checked, pressure tested,
bored and honed with deck plates, sonic tested for cylinder wall
thickness, and so on. This block uses the stock 2.748" Cleveland
main bearing journal size. In addition, the block is set up for
dry sump oiling (another road racer feature) and doesn't even have
a place to mount a stock internal pump. The block was prepared by
R.D.I. Blocks like this sell for almost $4000 new with the machining,
but I did a lot better on eBay, getting it for a little more than
half this much together with crank, rods, pistons, and timing set.
Ya gotta luv that eBay!
Crank: A Sonny
Bryant (great racing name) billet ultralight crankshaft. It has
a 3.4" stroke, gundrilled mains (for lightness), 2.000 rod
journals (to reduce friction when it spins = more HP), and weighs
in at only 45 pounds. This crank has been magnafluxed and will take
standard sized bearings. Did I mention its internally balanced?
This expensive procedure leads to a much smoother running engine--essentially
for high rpms and high horsepower durability.
Pistons: J&E
forged racing pistons, designed for Yates heads. These pistons have
been lateral gas ported and have a very small 0.060 dish and a 0.927"
pin. I'll be using a set of Precision Product wrist pins.
Rods: The rods
are Carrillo H-beam rods, absolutely the best rods around for racing
applications. They're 6.2" long and 0.940" wide, and are
equipped with Carr (super strong) 3/8" rod bolts. Rod weight
is about 635 grams and the set is matched. I've seen guys pay $2000
for a set of these babies, and I paid just a bit more than this
for the whole shortblock package.
Dampner: I
bought a Romac unit designed for internally balanced racing engines.
The so-called "blue label".
Bearings: I'll
be using Clevite 77 "P-Series" bearings, which are designed
for high performance engines.
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Heads |
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Valvetrain
Valves: Got
a set of Titanium intakes and exhausts.
Cam: Check
my Cam Design Thoughts. It'll
be a roller, but I want as much grunt as possible below 5000 rpm
so it jumps of the line quickly, but I also want to make sure it
doesn't just give up on me as you wind it up.
Lifters: Comp
Cams roller lifters.
Rockers: Comp
Cams roller rockers.
Springs: Comp
Cams.
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| Induction |
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Road racers have individual
injector stacks. It's a rule. So I need to do the same for my hot
rod. Check here to monitor
progress on my Kinsler-based EFI fuel injection system.

Whoa! Here's something I haven't seen in hot
rod land. Makes me wonder...
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Exhaust
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I want something really
funky for the exhaust. I can't just do a set of block huggers, even
though that would be much easier and cheaper. I crave something
high tech and in your face for the out-duction, just as I want something
really groving for the in-duction. I've always admired the curving
pipes on custom chopper bikes, and wanted to create the equivalent
of those graceful curves in a hot rod. The road
racers I'm used to all have those curvaceous snake pit exhaust
set ups. So let's string some of these concepts together, and do
a little out-of-the-box thinking with photos. Think about the curves,
those lovely voluptuous curves of polished tubing...

What is the car equivalent of these pipes?

Road racer pipes!

Formula 1 pipes!

Nice custom stainless NASCAR Tri-Y headers...

That's the spirit laddies! But almost too
outrageous here...

This one is nearly perfect...
I still
don't quite have the concept fully mapped out, but I'm on the scent.
I'm guessing I'll have to fabricate to get the pipes I want. That
means buying the flange that mates to the head, and a bunch of raw
stainless steel tubing, and then busting out the Tig welder to put
it all together.
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Ignition
I thought about a
coil-per-cylinder crank-triggered system. They're certainly high
tech, but having messed with one in my Pantera days (an Electromotive
unit), I found it to be a lot of trouble to fabricate, painful to
repair when it broke, and not particularly higher performance. I
also briefly considered a magneto, but that's too old-school. Gotta
go with the tried and true MSD billet distributor. That's the ticket!
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Cosmetics |
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Wiggins Clamps!

Fabricated sheet metal valve covers...
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Engine Assembly
Once I had accumulated
enough parts, it eventually became time to start assembling the
engine. I can work the heads and shortblock independently for quite
a while, so I will be skipping back and forth between the two. Prior
to beginning the assembly, I created a checklist by basically going
through every article I could find on the Cleveland, together with
a couple of good books on engine assembly and blueprinting. I basically
took everything anyone suggested and merged it into a master checklist.
I'll be following that list to try to make sure everything is done
right, in the correct order, with nothing left out.
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