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Texas Pro Stock Rules
GENERAL RULES: This class is designed for tube chassis doorslammers of any make, model 1950 or newer. No open wheel, open cockpit, or roadsters allowed. All cars must have working doors. All engine combinations will be limited to a maximum of 585 cubic inches and must be normally aspirated with carburetion or throttle body type fuel injection. No electronic fuel management systems allowed. NO turbochargers or superchargers of any type. NO NITROUS OXIDE is allowed. NO TRACTION CONTROL DEVICES PERMITTED. Any tire size is allowed.
1. Engine Combinations:
Big Block Chevrolet - Base engine combination is limited to 585 cubic inches. Any cast OEM or aftermarket single plane intake manifold for one carburetor or single throttle body injection, and any OEM style Mark IV design cast iron or aluminum cylinder head configuration is allowed. NO Big Chief, Big Duke,Olds, Pontiac or "Pro Stock" style spread port cylinder heads. The MINIMUM valve angle allowed is 22*. No welding is permitted on the exterior of the head; ie, with the valve cover in place no welds should be visible. Stock valve cover mounting surface and height must be retained for the casting used; ie, Dart, Brodix, Chevy. Welding under the valve cover area for repairs or re-inforcement only is permitted as well as welding in the "China Wall" area to reduce the gap created by angle milling the head. Epoxy, cnc, and head porting/polishing is allowed except for the following provision: welding or epoxying on the external portion of the cylinder head runner is permitted for repairs only, not to exceed two runners per head. Specifically, no welding allowed for the purpose of raising the intake port. Aftermarket engine blocks are allowed in either aluminum or cast iron, 4.840 bore spacing only. Tall deck cylinder blocks are allowed, 10.200 maximum, however they will be subject to P & G to verify the maximum cubic inch displacement of 585 . *** The minimum weight for this combination is 2450# with driver.
***Updates Effective 9-1-2007***
1) Only head castings/part numbers that were available for sale to the general public prior to September 1, 2007 will be legal for TPSA competition.
2) 55mm maximum camshaft barrel/diameter
3) Any sheetmetal used on an intake manifold will carry the 50# weight adjustment
Big Block Ford - All Ford entries are subject to P & G due to block design and are limited to 585 cubic inches. Any cast OEM or aftermarket single plane intake manifold for one carburetor or single throttle body injection is allowed. Cylinder heads will be limited to the use of A-429 or A-460 heads only . C-460, E-460 or any other pro stock-style cylinder heads are prohibited. *** The minimum weight for this combination is 2450# with driver.
Big Block Chrysler - All Chrysler entries are subject to P & G due to block design and are limited to 585 cubic inches. Any cast OEM or aftermarket single plane intake manifold for one carburetor or single throttle body injection is allowed. Cylinder heads allowed are the following; any cast Hemi head with water flow, the original Chrysler B-1 cylinder head, or Indy Cylinder head part #'s 57213 and 60013 . All pro stock-style cylinder head castings are prohibited. *** The minimum weight for this combination is 2450# with driver.
*** Big Block Weight Adjustments *** - The base minimum weight for all big block engine combinations with driver is 2450# . ~ Any type tunnel ram intake (cast or sheetmetal) with one carburetor adds 50# to the base weight. ~ Two carburetors, limited to a maximum of two, 4-barrel American automotive production carbs, regardless of intake type (cast or sheetmetal), adds 100# to the base weight. No "splits", "inline" multi barrel carbs, slide valves or motorcycle style carbs permitted. *Big Block participants can request a P & G and if the displacement is verified to be 565 to 541 cubic inches, they can subtract 50#, between 540 and 501 cubic inches subtract an additional 50# and if 500 cubic inches or less subtract another 50#.
Small Blocks - All Types (Chevy, Ford, Chrysler)- The basic small block engine has no cubic inch limit. Cylinder heads will be limited to inline valve design and original OEM valve angle. (example... Chevy 23 degree) Any normally aspirated induction combination allowed. Multiple carbs./throttle bodies, and tunnel ram intakes (cast or sheet metal) are allowed in this combination with no weight penalties. No splayed or canted valve head configurations allowed. This combination will weigh 2000# with driver.
***Update effective 9-1-2007***
1) The LSX series of SBC components will not be legal for TPSA competition
*** Small Block Weight Adjustments - The base minimum weight for all small block engines with driver is 2000#. Any other inline valve cylinder head (example 18 degree) adds 100#. When used with any cylinder heads other than the OEM valve angle , any type tunnel ram intake will add 75# , two carburetors in addition will add another 75# ...... EXAMPLE: 18 deg. heads, tunnel ram & 2 carbs = 2250#
All combinations - The use of Dry sump oil systems and Vacuum pumps are allowed . Aftermarket aluminum or cast iron engine blocks are allowed. The use of aluminum connecting rods is allowed.
2. Transmission - Powerglide (2 speed) based factory type automobile automatic transmission required. Aftermarket cases and/or tailhousings are allowed. Transbrakes are allowed. No three speed, clutch-type, Bruno, Lenco or any other aftermarket transmissions are allowed. No Lock-up convertors are allowed. Transmission technology changes rapidly and will be monitored.
3. Fuel - Any commercially available race gasoline or alcohol fuel is permitted. Alcohol fuel adds a 50# weight penalty. No performance additives of any kind are allowed.
4. Body - Full body required. Any make , model , 1950 or later. No open wheel, open cockpit or roadsters allowed. All cars must have operational doors . Full windows required. Maximum wheelbase allowed is 125". Carburetors must be covered by hood/scoop. Any fiberglass or carbon fiber body/panels allowed.
5. Electronics - " Our original concept was that this would be a driver/tuner class without the use of electronics". Traction Control Devices (TCD's) and devices that control the launch by sensing the starting lights are strictly prohibited! Delay Boxes, Data recorders, and electric/air shifters are allowed.
6. Power adders - Nitrous oxide is prohibited! Nitrous bottles must be removed and inlet lines to solenoids must be disconnected and capped. Fuel additives such as, but not limited to nitromethane and propylene oxide are prohibited . No superchargers, blowers or turbo chargers are allowed.
7. Championship Points - Points will be awarded to members in good standing as follows: 10 points for completing the TPSA tech, 11 points for a 1st round loss, 12 points for a 2nd round loss, 13 points for a 3rd round loss. Points are cumulative; ie, a 3rd round finish would = 46 points (10+11+12+13). The Runner-up receives 60 points, and the Winner receives 75 points, with a field of up to 16 cars. With a 17 to 32 car field, a 4th round loss would = 14 points, the Runner-up would receive 75 points and the winner 91 points. Cars must self start, stage under the vehicles own engine power, and receive the official starter's signal to go in order to receive points for the round. This rule also applies to single or "bye" runs.
*The tie breaker procedure, if needed, will be: 1) number of wins, 2) number of
r-u's, 3) head to head competition, 4) total rounds won, 5) number of races attended. If a tie should still exist, the competitors will split the awards.
These are the rules of the Texas Pro Stock Association and must be followed to participate in our class at race events... However, first and foremost each car and driver will be subject to an NHRA or IHRA (depending on the track of that day) technical safety inspection which will be performed by that race track's personnel. Texas Pro Stock Association has absolutely no control or influence over this inspection, and you may be disqualified from participation for non - compliance or infractions found during this inspection by the track officials! In the event that a decision regarding rules or procedures must be made that is not addressed by the TPSA rules, the sanctioning body rules of the host track; ie, NHRA or IHRA will be applied.
The Texas Pro Stock Association reserves the right to revise, modify, or make additions to the rules as stated in order to maintain a competitive field. Any revisions to these rules will be posted with a 30 day grace period before they become effective to allow time for adjustments to be made. Combinations will NOT be altered nor outlawed, however weight corrections will be adjusted as necessary to keep the field even. We will welcome any racer input throughout the year as to changes that you feel are in order. Our intention is to make all cars in competition as evenly matched as possible and make our organization a fun experience for all. Any questions regarding rules interpretation should be addressed to one of the committee members listed under the "Contact Us" button on the home page.
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