BIG DIAMOND RACEWAY
2010 SPORTSMAN ENGINE RULES
1/29/09
PREFACE:
In an effort to both control costs, and keep competition fair BD Raceway, LLC has adapted the sportman
rules to
accommodate combinations as the engines from other tracks at Big Diamond Raceway. In 2009, these engines may
go thru a vigorous inspection during the season. An outside tech group may be brought into randomly check
engines
and may require the heads to be pulled to check for engine spec. infractions.
GENERAL ENGINE RULES
1. All engines must maintain stock bore and stroke combinations
Engine Maximum Overbore C.I. Engines may not pump over specified cubic inch.
Chev 350 C.I. 4.00” bore x 3.480” stroke + .070 = 363 C.I.
Chry. 360 C.I. 4.00” bore x 3.578” stroke + .020 = 364 C I.
Chry. 340 C.I. 4.04” bore x 3.313” stroke + .060 = 350 C.I.
Ford 351 C.I. 4.00” bore x 3.500” stroke + .060 = 363 C.I.
2. Normally aspirated engines only are permitted. NO reverse rotation engines.
3. BLOCKS – This class is reserved for North American passenger car V-8 engines with iron blocks.
OEM production engine blocks under 360 cubic inches but no less than 340 cubic inches. Aftermarket
iron blocks, such
as; Dart Iron Eagle or ‘Little M’, Merlin, Bow-Tie etc., copies are permitted but must be
equivalent to its
stock counterpart. OEM deck height and cam location are required on all blocks. No
aluminum blocks!
4. HEADS -
• Chevrolet, Ford, or Chrysler cast iron factory production heads only. Chevy Bow-Tie, Chevy
Vortec; 180 cc / 200 cc Dart Iron Eagle Heads (180c.c. recommended); Ford Performance
cylinder head N352, N351; Chrysler
W-2 performance head are all permitted.
• All heads must maintain the stock valve guide angle. Valve head sizes are optional provided
they
maintain stock OEM positioning in valve guides. Valve guides liners are allowed. Any angle valve
job will be
permitted as long as it is done on a machine that cuts concentric to the valve center.
• All heads must remain UNPORTED. All cylinder heads shall be required to pass a ball test
and
meet stock port size requirements. A go/no-go gauge will be used to determine the height of the
intake port. A
go/no-go gauge will be used to determine the height and width of the exhaust port.
A go/no-go intake runner ball will
be used to determine the dimension of the intake runner. An
exhaust valve seat ball consisting of a .531” diameter
ball bearing welded to a ¼” flexible shaft
will be used with the valve fully opened, the ball will be placed against
the valve stem and moved
in a full circle (360 degrees) around the valve stem. If the ball drops down through the valve
seat
in any position around the full circle of the valve stem, it will be deemed illegal. An intake valve
seat ball
using the same procedure as described for the exhaust side will be used, except the ball
size will be .787.
• All cylinder heads must remain in factory condition with no modifications. No modifications
means
no sand blasting, bead blasting, acid dipping, porting, port matching, gasket matching, polishing,
welding,
or epoxy. No relieving or unshrouding of the valves in the combustion chamber. No hand
grinding, sanding, blending, or
de-burring. Inspection will be conducted with the head on the
engine, but the method of checking may require the removal
of the intake and exhaust manifolds.
Heads will be removed only to surrender to BD Raceway officials for appeal or protest
and to
visually inspect for any modifications.
• The modification of the valve spring pockets to accept larges valve springs for higher
RPM
operation is permitted.
• Screw in rocker studs and guide plates are permitted.
• Angle milling or straight milling of the cylinder heads to increase compression ratio
is permitted.
The angle milling procedure may include re-machining intake surfaces, opening pushrod holes
and straightening
and chamfering head bolt holes.
• No titanium engine parts of any kind except for valve keepers/retainers and locks.
• Any Carbon Fiber parts are illegal.
The method of teching heads will hold true for a hot or cold engine.
5. CRANKSHAFT – Any stock appearing cast iron or forged steel crankshaft is permitted. Lightening
or
balancing holes through rod journals are permitted. No knife edging, narrowing or cutting down the
diameter of
the crank counterweights. No machine work to be done to crank counterweights or journals
with the exception of normal
balancing and resurfacing procedures. Only stock type engine bearings
allowed.
6. RODS – Any factory production or aftermarket cast iron or forged solid steel connecting
rod. No
aluminum, titanium, polished or billet. 6” maximum rod length except for Chrysler which may be 6.125”.
No machine work may be done to connecting rods except for shot peening, and normal balancing and
resizing procedures.
NO titanium or aluminum!
7. PISTONS – Any brand, three ring flat top aluminum pistons only. No coating of any kind
are allowed. 0
deck height. No part of piston can extend above the block.
8. CAMSHAFT – No roller cams, roller gear driven cams, roller, mushroom lifters or lash caps
are
allowed. Camshaft may be of any brand. Only hydraulic or mechanical/solid flat tappet type camshafts
permitted.
Camshaft and lifters must be solid steel or cast iron construction only. Camshaft must be
located in factory position
in block. Stock type and size cam bearings only. Lifters and lifter bores are to
remain stock in diameter and are to remain
in stock location within block. Sleeving of the lifter bores to
compensate for wear is permitted. Stock type timing chain
and gears only. No gear drives, belt drives or
devices with external camshaft timing provisions are allowed. Roller rocker
arms of any ration are
permitted.
9. INTAKE MANIFOLD – 1. Must be a stock passenger car, cast iron 2 barrel intake manifold
only. No
porting, polishing, welding, gasket matching or acid dipping is allowed.
2. Any Edelbrock aluminum four barrel as cast box stock, spec manifold may be used. No
work of
any kind may be done on these manifiolds.
3. The manufacturer is Brodix part #HV1011 for Chevy, Edelbrock part number 2915 for
Chrysler
340 heads, Edelbrock part number 2920 for the Chrysler W-2 head, and Edelbrock
part number 2981 for the Ford 351 Windsor.
Any make carb spacer – adapter will be allowed providing it does not measure more than
a maximum of
1” thick with gasket.
10. CARBURETOR – Any American stock OEM 2 barrel carburetor up to 1 11/16” throttle bore
with no
adapter plate is legal on cast iron manifolds. The Holley carburetor, part #4412 is the only acceptable
carburetor
and must run a maximum spacer adapter of 11/16” including gaskets. No modifications of any
kind will be allowed
to these carburetors except removal of choke plate and shaft. Do not remove choke
horn! Box Stock ONLY! The jets may be
changed as needed. Mechanical throttle linkage only. Double
return springs required. Conventional round type air cleaners
only. Air cleaners that provide ventilation
through the top cover are permitted. No air induction plastic carburetor inserts
or other devices to direct
air into intake. No air diffusers are allowed. - Holes drilled in the throttle plates for proper
idling.
11. FUEL PUMP: Only 1 stock type mechanical fuel pump located in stock location on engine is
permitted.
No electric or cam driven fuel pumps allowed.
12. OIL SYSTEM - No dry sump system is allowed. Oil must be in steel pan only. Oil pan must have
3/4”
inspection hole for connecting rod verification on left side of pan. No external oil pumps or Accu-sumps
allowed.
Oil coolers will be permitted providing they are mounted under the left wing or under the hood
only.
13. WATER PUMPS - May be cast iron or aluminum only. Radiator fan must be steel only. No electric
cooling fans or pumps.
14. FUEL - GASOLINE ONLY. No nitrous or any other additives are permitted. The base fuel used
for
testing will be track fuel.
15. Ignition – Only stock type battery ignition systems permitted. Use of aftermarket stock
type distributor
is permitted. No external or internal ignition boxes or ignition amplifier permitted. On H.E.I ignition,
coils
must remain in distributor in stock OEM. No crank trigger ignition systems No traction control devices of
any
kind. The use of aftermarket Add-on rev-limiter to protect engine from over-revving is permitted
16. VIBRATION DAMPENERS - May use any SFI approved harmonic balancer.
17. Weight – Chevy/Ford/Chysler Stock = 2450 lbs.
180cc/200cc Dart Heads = 2450 lbs
Vortec Heads = 2450 lbs
Any other combination may have substantial weight added per tech and mgmt.
PENALTIES from DISQUALIFICATION:
Big Diamond Raceway is a fair racing facility. We will have minor and major infractions, decided
at the
discrepancy of head tech official and approved by track management.
MINOR INFRACTIONS:
An infraction not intentionally intended to cheat the track or other competitors. Examples are
weight
infractions, carburetor gauge infractions, etc…
• Will lose all money won for the evening.
• Will lose all points for the evening, but will receive average money won handicap points
(therefore you will not benefit from disqualification).
MAJOR INFRACTIONS:
An infraction intentionally intended to cheat the track or other competitors, knowingly
giving
yourself an unfair advantage. Examples are traction control, tire softners or hardners, illegal
engine modifications
(driver/owner are responsible for engine, know what you are getting from
your builder), etc…
• Will lose all money won for the evening.
• Will lose all award points for the year.
• Will lose all average money handicap points, and will be given feature win handicap money
for the night. The following week you will begin as a newcomer with handicapping money
from the disqualification.
• Fine may be imposed.
• Part may be confiscated (if you do not give up part suspension may occur).
Please do not put us in a position to make a major infraction decision, it is an
embarrassment
to you and the track.
