F6 + FB + GTL at Buttonwillow Raceway Park

In GTL Engines - MAZDA, Spec Lines, 12A, change as follows effective 3/1/2021:
Fuel Induction: "27 29mm SIR"
Weight: "1950 2000"
Notes: "May use a 28mm SIR plus 175lbs."

In GTL Engines - HONDA, change Split B18 as follows:
GT Engines - HONDA
Engine Type Bore x
Stroke
(mm)
Disp.
(CC)
Head Type Valves / Cyl. Fuel Induction Weight (lbs) Notes
DOHC 81.0 X
87.2
1797 Alum,
Crossflow
4 22.5mm SIR 2050
DOHC 81.0 x 89.0 1834 Alum,
Crossflow
4 22.5mm SIR 2065

In GTL Spec Lines, Sentra (B13), add to Notes as follows:
"May have hood bulge (Max. of 1.5”H x 10.0” L x 6.0 W)"

In GT Cars - BMW, add the following:
GT Cars - BMW
Model Years Body Style Drive-
line
Wheel-
base (in)

In GCR, Section 9.1.2.G.16., change as follows:
"0-80541-1 0-80541-2"
In GCR, Section 9.1.2.G., Appendix Z 5.a. change as follows:
"0-80541-1 0-80541-2"
In GCR, TA2 Appendix B.3.4, change as follows:
"#6010 6014X"

In GT3 Engines - VOLKSWAGEN, classify Fun Cup Beetle EVO3 as follows:
GT3 Engines - VOLKSWAGON

A specification table follows in the original; it is not shown here.

In GT Cars - Ginetta G40 as follows:
GTL Cars - GINETTA
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Ginetta G40 2002-
Present
2-Door Coupe RWD 88.6” Must comply with all GTL rules except as
noted on spec line. May use FIA roll cage.
Must have complete build specs in
possession at all race events.
In GT Engines - Ginetta/Ford Zetec as follows:
GTL Engines - GINETTA
Engine Family Bore x Stroke
(mm)
Disp.
(CC)
Head Type Valves /
Cyl.
Fuel Induction Weight (lbs) Notes
Ginetta/Ford
Zetec
80.6mm X 88.0mm 1796cc Crossflow 4 22.5 SIR 2050
+ 51 lbs for
IRS.
+ 26lbs. for
sequential.

In GT, GCR Section 9.1.2.F.7.a.6:
"Glass and/or plastic headlights, front parking lights, front signal lights, lenses, and bulbs shall be removed. Headlight openings
shall be covered with a wire mesh screen or panel having the same contour as the original lens, mounted so that the headlight
bezel/rim remains in place, maintaining the standard appearance of the Production automobile. Side marker light assemblies
shall be removed and the resulting openings covered with a plate whose dimensions do not exceed those of the original parts;
side marker lights that are an integral part of the taillight assembly cannot be removed. Other lighting parts and operating
mechanisms may be removed. In the case of pop-up headlights, the entire assembly may be removed and the opening covered
with a screen or plate (as above, without the headlight bezel/rim requirement) which provides a stock appearance. It is not
permitted to relocate the standard headlight, parking light, signal light, etc., openings. Traditional GT cars only. Not allowed with
any "Spec Car, GT2-ST, or any other added non Traditional GT car. Taillights shall be in the original location and shall may be the
original style/type of taillight for the make, model, and year of car. A rear body panel having the same contour as the original
lens area and in the original location, may be fitted with a tail-light graphic of the original style/type frame/lens adhered to it. If
side marker lights are an integral part of the tail-light assembly they must be represented by the panel graphic. These
panel/graphics shall have a functioning red LED lamp assembly fitted through them on both sides of the car to serve as brake
lights. A 15-watt or equivalent rain light may be included with-in this LED assembly or may be a separately mounted single or
dual LED assembly."

In GTL Spec Lines, Engines - TOYOTA, add as follows:

A specification table follows in the original; it is not shown here.

In Gt Light Engines Spec Lines, 1500 Limited Prep (Engine & Chassis), change weight as follows:
"2000 → 1835"

In GCR Appendix L-TA2 rules, Addendum A, change A.2. as follows:
"The throttle body must be either a GM 90mm, electronic, part #1257 → 0790, or Edelbrock 90mm, mechanical, part 33869 or
#3870."
In GTA, GCR Section 9.1.2.G.3., change as follows:
"The throttle body must be either a GM 90mm, electronic, part #1257 → 0790, or Edelbrock 90mm, mechanical, part 33869 or
#3870."

In GT Cars - GT Light Spec Lines, add Ford Festiva as follows:
GT Cars – GT Lite
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Ford Festiva 1988-1993 3 Dr.
Hatchback
FWD 90.2
In GT Lite Engines, Spec Lines, add Mazda B3 as follows:
GT Lite Engines -

A specification table follows in the original; it is not shown here.

In GT2 Spec Lines, Engines - Toyota, add the following Spec Line:
Engines - TOYOTA
Engine
Family
Engine Type Bore x

A specification table follows in the original; it is not shown here.

In GTL Spec Lines, Engines - Toyota, add to Notes as follows:
3K: "May use 4Y block only"
4K: "May use 4Y block only"
5K: "May use 4Y block only"

In GT Spec Lines, GT1 Cars - Fields Cardinal, classify Fields Cardinal V8 as follows:
GT1 Cars – Fields Cardinal
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Fields Cardinal V8 2023 2 Dr. RWD 92.0 Roll Cage MUST be modified to comply with
GCR Section 9.4.
In GT Spec Lines, GT1Engines - classify Ford V8 as follows:
GT1 Engines - Ford
Engine
Family
Engine Type Bore x

A specification table follows in the original; it is not shown here.

In GTL Spec Lines, GTL Engines - NISSAN, Engine Family A14, change weight as follows:
"1850 1800"

from the current (or before) Table of Contents (TOC), to what is shown in the after TOC.
GTL spec lines will now be contiguous with GT2 and 3 spec lines.
GTA category and spec lines will be moved and renumbered behind GTL. GTA Section will not change but page numbers will, (as
shown in Red italics).
9.1.2.F. GT-2, 3, LITE Category Specifications 314
GT2 Cars 327
GT2/ST 341
GT3 Cars 348
GTL Cars 364
GTA Cars 377
P2 Engine Table B.1
2010 and older
Stock Kawasaki
38.5mm
minimum width 52 inches. AMAC-AM5:
minimum width 54 inches.
P2 Engine Table B.1
2008 and older
Stock Engine Suzuki,
Yamaha,
Honda, BMW
38.5mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 38.5mm
Modified Engine
950 lbs.
1005cc max
P2 Engine Table B.1 37mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 39mm
Stock Engine
1050 lbs.

In GCR, GTL Cars, create new sub chart as follows:
In GTL change weights for unrestricted engines under 1399cc as follows:
Alfa Romeo 1130cc 1605 1565
1290cc 1605 1565
1357cc 1605 1565
AMC/Renault 1289cc 1660 1619
Triumph Spitfire 1147cc 1530 1492
mini 1275cc 1570 1531
1380cc 1650 1609
Sprite/Midget 1275cc 1680 1638
1380cc 1760 1716
1399cc 1780 1738
mini w/X-Flow Head 1275cc 1700 1675
Sprite/Midget w/X-Flow Head 1275cc 1810 1765
Triumph Spitfire 1296cc 1680 1638
Fiat 1116cc 1365 1331
1290cc 1595 1555
Fiat w/1500 block 1290cc 1620 1579
Ford 1198cc 1550 1511
1297cc 1550 1511
Honda 1170cc 1590 1550
1237cc 1675 1633
Mazda 1272cc 1680 1638
1296cc 1645 1604
Nissan 1171cc 1550 1511
1237cc 1645 1604
1310cc 1685 1643
A12 W/a14 block 1237cc 1665 1623
1288cc 1720 1677
Nissan 1368cc 1760 1716
Subaru 1189cc 1545 1506
1267cc 1675 1633
Toyota 1166cc 1610 1570
1290cc 1645 1604
Volkswagen
Siamesed Intake Port 1285cc 1520 1482
Dual Intake Port 1285cc 1615 1575

In GTL Honda Cars, classify Honda Fit as follows:
GTL HONDA Cars -
Model Years Body Style Drive-line Wheel-base (in) Notes
FIT 2009-13 2 Dr. FWD 99.0 Alternate wheel bases
94.0”
97.0”

In GT3 Engines - Mazda Spec Lines, add to Notes as follows:
12A Street Port: "Contact National Office for specific details of various allowable port configurations. May machine and use 13B
housing to O.E. 12A spec’s."
12A Bridge Port: "Optional choke size 42mm @2010lbs. May machine and use 13B housing to O.E. 12A spec’s."
12A Peripheral Port @ 2150lbs: "May machine and use 13B housing to O.E. 12A spec’s."
12A Peripheral Port @ 2300lbs: "Disenfranchised GT2* May machine and use 13B housing to O.E. 12A spec’s."

In GTL Cars - TOYOTA Spec Lines, classify DR86 as follows:
GTL Cars - TOYOTA
Model Years Body Style Drive-line Wheel-base (in) Notes
DR86 2021-2024 2 DR RWD 101.3

In GTL Cars - BMC thru Rover Group Spec Lines, BMW Mini, change Years as follows:
"2002-2013"

In GCR Section 9.1.2.G (GTA Category Specifications), change as follows:
“9.1.2.G.III.I
The single-plane rear spoiler must be mounted at an angel angle from 50 to 75 degrees (perpendicular to the ground
being 90 degrees) and may not extend beyond the rear bumper when viewed from directly above the rear
bumper. Spoilers must be a minimum of .063 aluminum or Lexan and may vary in overall height to match the contours
of the bodywork. The rear spoiler dimensions shall not exceed 59.0 inches wide by 5.0 inches in height, (measured on
the material surface) , or 295.0 square inches total surface area. Braces to prevent spoiler deflection are allowed, but
may serve no other purpose.”

In GCR, Section 9.1.2.F.7.5.E. change as follows:
“Direct Injection is not permitted only if it came OE and must be installed using only OE high pressure pump(s), hard and
soft hoses and injectors.”

In GT2/3 modify Spec Line notes as follows:
GT2:
Nissan: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
GT3:
Mazda: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
Mitsubishi 4G93: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E. ”
Nissan QR25DE/DD 1988cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
Nissan QE25DE/DD 2489cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”