MOTOR
MANIACS
"THIS IS A
ENGINE
BUILDERS REFERENCE GUIDE.
FAMOUS
QUOTE........................
"HORSEPOWER IS A QUESTION OF MONEY,
HOW
MUCH DO YOU WANT TO SPEND?"
BORE&STROKE SPECS
(chevy)
454= 4.250 x 4.00 327= 4.000 x 3.25
427= 4.250 x 3.76 307= 3.875 x 3.25
396= 4.125 x 3.76 305= 3.736 x 3.48
350= 4.000 x 3.48 283= 3.875 x 3.00
___________________________________________________
FIRING ORDER
V-8............ 1 8 4 3 6 5 7
2
V-6............ 1 6 5 4 3
2
Inline-6..... 1 5 3
6 2 4 ___________________________________________________
TORQUE SPECS
small block
big block
Cylinder Head Bolts
65-ft.lbs
80-ft.lbs
Main Bearing Cap
80-ft.lbs
110-ft.lbs
Rod Bearing Cap
45-ft.lbs
50-ft.lbs
Intake Manifold Bolts
30-ft.lbs
30-ft.lbs
Exhaust Manifold Bolts
30-ft.lbs
30-ft.lbs
Harmonic Balancer Bolt
65-ft.lbs
85-ft.lbs
Oil Pump Bolt
65-ft.lbs
65-ft.lbs
Camshaft Bolts
20-ft.lbs
20-ft.lbs
NOTE: These torque specs are with
clean lightly oiled threads.The reason torque specs are important is because
overtorquing causes stripped threads and under torquing causes loose bolts.Aluminum
and stainless parts require different specs.
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CRANKSHAFT&BLOCK
small block
big block
crank end-play
.003-.007
.006-.010
max block taper limit
.001
.001
max. journal out of round
.001
.001
main bearing oil clearance
.0015-.003
.002-.003
rod bearing oil clearance
.0015-.0025
.0015-.003
rod end-play
.008-.015
.015-.025
NOTE: These figures are for
mostly
stock type rebuilds.On a high performance application stay on the high
end of these specs,but dont go overboard as this causes excess oil splash
in the crankcase, and drops the oil pressure.
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PISTONS&RINGS
SMALL BLOCK
BIG BLOCK
Piston to bore clearance
.0007-.0017
.003-.004
service limit
.0027
.005
piston ring end-gap top
.010-.020
.010-.020
second ring
.010-.025
.010-.025
oil-control
.015-.055
.015-.055
NOTE: These specs are for
standard cast pistons. Forged racing pistons require
more clearance to allow for expansion.
-----------------------------------------------------------------------------------------------------
Compression test - 125lbs.
minimum per cylinder. (varies by application) No more than 10% variation
between cylinders.
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Oil Pressure (hot)
idle 15lbs. minimum, then 10 lbs. per 1000rpm minimum beyond that up to
a max of about 60lbs.
NOTE: The oil pressure is always
higher when it is cold,check oil pressure hot. WARNING: Never race a cold
engine.
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Ideal Water Temp -
small block 180-190
big block 190-200.
NOTE: Running an engine too cold
reduces engine efficiency,running too hot (over 210) can cause serious
engine damage.
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LINKS
small
block casting numbers big
block casting numbers
nascar
nhra