Tazewell Speedway Late Model Division Rules
Same as Lucas Oil Series
365 CID Max Weight 2275 lbs
OEM Cast Steel
Block or Aftermarket cast Steel Block
Max Bore 4.070 (.003 Tolerance)
Steel Crank Only Balancing ok 3.500 Max Stroke
Flat top only, no radius Deck Pistons, Zero Deck Min.
Steel Rods Only. No Titanium or Aluminum
Wet or Dry
No Vacuum Pumps
Must be cast aluminum. Porting
allowed no two piece manifolds
Auxiliary Cooling Lines OK
Steel Only Heads Must be 23 Deg. Style No raised runners
Angle Milling allowed,
minimum valve angle is 22 deg.
Angle plugs are allowed, in stock location
Steel valves only, hollow stem allowed, no titanium
11/32 stem valves, undercut
Max. valve 2.02 int. 1.600 exh.
Max CC on int runner is 205 cc
No minimum or combustion chamber volume
No porting, or polishing is allowed,
no shot peening allowed
Valve spring pockets may be machined
valve job is permitted with no hand blending
Stud mounted rockers with stud
girdle or jesel rockers are allowed
Flat tappet style
Flat tappet style only
.842 max diam.
No mushroom lifters,
or radius, or ceramic, or roller are allowed
One 4 barrell
4150 style, No dominators
Gas or E-85
365 CID Max Weight 2350 lbs
OEM cast steel block, or aftermarket cast steel block
Max bore 4.070 (.003
Steel Crank only Balancing OK 3.500 Max stroke
Steel rods only, no titanium or aluminum
Wet or dry No vacuum pumps
Must be cast aluminum. Porting allowed no two piece manifolds
Auxiliary cooling lines ok
Steel only Heads must be 23 deg style No raised runners
Angle milling allowed,
minimum valve angle is 21 deg
Angle Plugs are allowed, in stock location
11/32 stem valves, undercut allowed
Steel or titanium valves allowed
valve size 2.0555 int. 1.600 Exh
Porting or polishing is allowed
spring pockets may be machined
Racing style valve job is permitted
mounted rockers with stud girdle or jesel rockers are allowed
Roller or flat tappet is allowed
Roller lifters are
.842 max diam.
One 4 barrell, 4150 style,
Gas or E-85
365 CID Max Weight Raised runner heads: 2475 lbs. non-raised runner
heads 2400 lbs.
23 deg style heads No 14 deg. Heads allowed.
minimum valve angle 21 degrees
One 4 barrell 4150 style no dominators
Both rear tires must punch 56 before qualifying and feature race.
CT525 GM Performance Weight 2275 lbs.
No tire rule
must have original chevrolet performance GM seals
602 or 604 GM crate engines
604 GM. 12 in spoiler no weight min.
602 GM. 12 in. spoiler with 12x32 left side spoiler no weight min.
engines must remain stock
Crate engines will be tech as per NESMITH specs
One four barrell, 4150 style
Gas or E-85
Any carb spacer
Tires may be checked for chemical soaking
Engine set back
will be 6 inches from center of top ball joint to the most forward spark plug
Gas or E-85 fuel allowed. The specific gravity may not exceed .750
fee for fuel check is $50.00
Weight for engine combination your claiming must
be posted on right side "A" pillar. Failure to post correct weight will
result in disqualification. If no weight is posted, you will have only 1 lap to
No traction control device of any kind
Electronic ignition boxes
may be bought for $300.00
Visual protest fee is $75.00 Track retains $25.00
Rod protest fee is $100.00 Track retains $50.00
Engine Protest fee for Engine
A B C is $400.00 Track retains $100.00
Engine protest fee for engine D is
$100.00 Check bolts and box
Working raceceivers are mandatory
rod verification. Oil pan will be removed or inspection plugs can be installed
in oil pan
limit on tear down must be done in timely manner. Track officials will monitor
If the official declares that has not been done in a timely manner,
the official reserves the right to declare disqualification.
track reserves the right to amend, delete or change rules in the interest of competition.
Late Model 2016 Purse