Late Models will follow the 2022 NASCAR Advance Auto Parts Weekly Series rulebook.

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Ford D347SR Crate Engine                                3100 lbs.                     1400 lbs.

General Motors “Upgrade”                               3100 lbs.                     1400 lbs.

General Motors “Harrington Enforcer”           3100 lbs.                     1400 lbs.

Dodge      (Built)                                                   3050 lbs.                     1375 lbs.

Ford (Built)                                                            3050 lbs.                     1375 lbs.     

General Motors (Built)                                         3050 lbs.                     1375 lbs.

 General Motors Crate Engine                            3050 lbs.                     1375 lbs.

 

Carburetors

When the open/built and General Motors upgrade engines are used the carburetors listed below are the only carburetors permitted. 

Holley 500 CFM-HP two (2) barrel, part # 80583-1

Holley 500 CFM Ultra HP two (2) barrel (aluminum body) Part # 4412HB

(Hard Core™ Gray)

Holley 500 CFM Ultra XP two (2) barrel (aluminum body) Part # 4412HBX

(Hard Core™ Gray)

Holley 500 CFM Ultra HP two (2) barrel (aluminum body) Part # 4412BK

(Tumble polished aluminum with Black™ Metering block & baseplate)

Holley 500 CFM Ultra XP two (2) barrel (aluminum body) Part # 4412BKX (Tumble polished aluminum with Black™ Metering block & baseplate) See B. and C. below for Holley carburetor rework guidelines.

When the Ford D347SR and General Motors (part #’s #88958604 or #19318604) crate engines are used the carburetors listed below are the only carburetors permitted. 

Holley 390 CFM four (4) barrel, Part # 80507-1

Holley 650 CFM four (4) barrel, Part # 80541-1

Holley 650 CFM four (4) barrel, Part # 80541-2 See D. below for Holley carburetor rework guidelines.

When the General Motors “Harrington Enforcer” is used the carburetors listed below are the only carburetors permitted. 

Holley 650 CFM four (4) barrel, Part # 80541-1

Holley 650 CFM four (4) barrel, Part # 80541-2 See D. below for Holley carburetor rework guidelines. through D. remains the same.

 

Carburetor Spacer / Gaskets

Only a one-piece, solid, aluminum carburetor spacer, a minimum 0.700 inch, maximum 0.750 inch in thickness, must be installed between intake manifold and carburetor on all open/built engines. The spacer must be centered on the intake manifold and have two (2) round holes with 1-11/16 inch diameter openings for the 500 CFM-HP carburetor located in the center that match the base of the Holes must be cut perpendicular with the base of the carburetor.  Taper, bevels, or any modifications will not be permitted.

A one-piece, solid, aluminum two (2) hole tapered (super sucker style) carburetor spacer, one (1) inch maximum thickness will be permitted on the General Motors “Upgrade” engine only. The spacer must be centered on the intake manifold.

A one-piece, two (2) hole non-metallic gasket, maximum 0.065 inch thickness that matches the exterior dimensions of the carburetor throttle base plate, must be installed between the carburetor and spacer. A one-piece non-metallic gasket maximum 0.065 inch thickness must be installed between the spacer and intake manifold. The gasket must not be larger than the top of the intake manifold.

A one-piece, solid, open aluminum carburetor spacer, one (1) inch in thickness, will be permitted between intake manifold and carburetor on the General Motors #88958604, #19318604 crate-type and the General Motors “Harrington Enforcer” The (1) inch spacer may be utilized on the Ford D347SR crate- type engines with the 390 carburetor.

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