I-88 Speedway Modified Engine Rules

Changes were made to the fuel section of the Big Block-Big Small Block (0ver 358 Ci) Engine and the 358 Modified Engine on 01/14/2011.

The Modified engine rules for I-88 Speedway are listed on this page. Use the links below to view rules for General l Rules, Sportsman engines, and all classes. Each page of rules includes a PDF Document that you can download, save or print. Or, you can just print the web page.

[General Rules] [Modified Engine Rules] [Sportsman Engine Rules] [Modified and Sportsman Rules] [Street Stock Rules] [Four Cylinder FWD Rules] [IMCA Website Rules Page]

Forms: [2011 Driver Sponsor Sheet] [I-88 Speedway License]

MODIFIED ENGINE

[BIG BLOCK-BIG SMALL BLOCK (OVER 358 CI) ENGINE SPECIFICATIONS] [Engine] [Carburetor] [Intake Manifold] [Cylinder Heads] [Camshaft] [Pistons / Rods / Crankshaft] [Ignition] [Lubrication] [Fuel]

[358 MODIFIED ENGINE SPECIFICATIONS] [Engine] [Blocks] [Cylinder Heads] [Crankshaft] [Rods] [Pistons] [Vibrations Dampeners] [Camshaft] [Intake Manifold] [Carburetor] [Ignition] [Lubrication System] [Fuel]

[Printable PDF Document of Modified Engine Rules] [Download Adobe Acrobat]

BIG BLOCK-BIG SMALL BLOCK (0VER 358 CI) ENGINE SPECIFICATIONS

(I-88 Speedway allows various engine combinations. This is a guideline for the more popular).

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Engine:

1. Only stock OEM American long block (in length) manufactured V-8 engines (GM, Ford, or Chrysler) are permitted.
2. Aftermarket Dart and Merlin cast iron blocks are permitted.
3. No aluminum blocks are permitted.
4. Only normally aspirated engines are permitted.
5. Maximum displacement of 467 cu. in. 396 cu. in will be the minimum displacement permitted! A 10 cubic inch max. limit will be allowed for wear.
6. No reverse rotation engines.

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Carburetor:

1. Engine limited to one four barrel carburetor from an established American carburetor manufacturer. A manufacturer, is defined as a builder that produces a minimum of 600 units per year.
2. Carburetor not to exceed 4 venturies, 650 or 750 maximum on small blocks over 361 ci and must pass no go gauge.
3. No fuel injection, no nitrous oxide injection, no turbo chargers, or superchargers are permitted.
4. Holley hp carbs allowed.
5. No fuel or air may enter by any means other than stock operation of the carburetor.
6. No in-line venturi carburetors.

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Intake Manifold:

1. Optional as to design or manufacturer, but the manifold must allow for the mounting of only one 4 barrel carburetor.
2. Must be cast iron or cast aluminum only.
3. Porting is permitted.

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Cylinder Heads:

1. Optional as to design or manufacturer but must be made of cast aluminum or cast iron only.
2. Any form of porting is permitted.
3. Valve sizes are optional.
4. Titanium valves and retainers are permitted.
5. No hollow stem valves or liquid cooled valves are permitted.
6. Only 2 valves per cylinder are permitted.
7. Only one spark plug per cylinder.

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Camshaft:

1. Optional as to design or manufacturer but camshaft must be in block in stock location.
2. Chain or belt drives are permitted.
3. No overhead cams are permitted.

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Pistons / Rods / Crankshaft:

1. Only aluminum pistons, with no coatings of any kind are permitted.
2. Any steel or cast iron crankshaft is permitted.
3. Any design, length, or make of steel rods are permitted.
4. No titanium crankshafts or rods are permitted.

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Ignition:

1. Any kind of ignition is permitted, as long as it is mechanically driven in the stock position.
2. No crank trigger ignition systems are permitted.
3. Only one ignition coil and one ignition box (amplifier) are permitted on the car.
4. Only one spark plug per cylinder is permitted.
5. Traction control devices are not permitted. Traction control devises that use the brakes are also illegal.
6. Ignition boxes must remain as manufactured with no internal or external alterations. NOTE: Ignition boxes may be swapped or confiscated by Speedway at any time.
7. Wiring must remain as designed by box manufacturer.

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Lubrication System:

1. Conventional or dry sump may be used.
2. An internal or external pump is permitted.
3. Oil coolers are optional.
4. Only one oil tank and one oil cooler are permitted! Oil pan must be made from steel or aluminum only.
5. Air pumps / vacuum pumps that suck air from the oil pan are not permitted. Oil pan must have a 1" plug on the left side to allow for verification of steel crankshaft and rods.
6. Oil pans will be pulled down only when protested or in the absence of the 1" plug.
7. The oil tank and the oil cooler may be mounted outside the frame rails.
8. Oil tank maximum capacity not to exceed 12 US quarts.
9. Tank and cooler must be fully enclosed by the body and must be securely mounted. See cooler location in minimum specification rules. Excessive bracing used for mounting these items to obtain more left side weight is subject to the discretion of the track inspector.

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Fuel:

1. Only racing fuel or pump gas is permitted.
2. No nitrous or any other additives are permitted.
3. All fuels are subject to random testing at each track.
4. No electric fuel pumps are permitted.

358 MODIFIED ENGINE SPECIFICATIONS

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Engine:

1. This class is reserved for North American passenger car V-8 engines with cast iron blocks and iron cylinder heads. An option for Brodix aluminum cylinder heads is available.
2. All engines must maintain stock bore and stroke combinations
• Engine Maximum Overbore C.I.
  • Chevy 350 C.I 4.00" bore x 3.480" stroke. +.070 = 363
  • Chry. 360 C.I 4.00" bore x 3.578" stroke. +.020 = 364
  • Chry. 340 C.I 4.04" bore x 3.313" stroke. +.060 = 350
  • Ford 351 C.I 4.00" bore x 3.500" stroke. +.060 = 363
3. Engines may not pump more than specified cubic inch.
4. Normally aspirated engines only are permitted. No reverse rotation engines.

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Blocks:

1. Stock OEM and cast iron performance blocks such as Chrysler (R) Block, Chevy Bow-Tie, Ford-SVO, and DART are permitted. NO Aluminum blocks.

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Cylinder Heads:

1. NO SB2 HEADS

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Crankshaft:

1. Any steel or cast iron crank is permitted providing it maintains stock stroke as manufactured for the engine block used.

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Rods:

1. OEM stock production or aftermarket solid steel rods are permitted
2. No titanium or aluminum! Maximum rod length will be 6".
3. Engines with longer than 6" rods must meet stock OEM specs.

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Pistons:

1. Any make 3 ring flat top aluminum pistons only.

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Vibration Dampeners:

1. May be any stock OEM or aftermarket steel or cast-iron only.
2. No fluid or friction dampeners permitted.
3. Must be one piece construction only.
4. No bolts or snap-ring assemblies.
5. Safety snap rings are permitted.
6. Rubber-lined is permitted.

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Camshaft:

1. Optional as to design or manufacturer but camshaft must be in block in stock location.
2. No gear or belt drives are permitted.
3. No overhead cams are permitted.
4. Roller and or shaft rockers are permitted.
5. Stud girdles are permitted.
6. Lifters must retain stock diameters, angles and positions. Re- bushing for wear is permitted.
7. No lash caps permitted

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Intake Manifold:

1. Any American production cast aluminum single plane manifold that allows for the mounting of one 4 bbl. carburetor.
2. Part and casting numbers must remain visible and may not be removed by grinding or other.
3. Manifold may be ported as seen fit, but no material may be added.

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Carburetor:

1. One 650 or 750 cfm carburetor. Holley HP series allowed.
2. The carburetor must maintain stock venturi and throttle bore dimensions.
3. The carburetor must remain stock in all respects including location.
4. Booster height must remain stock (no cutting or polishing).
5. No visible modifications without disassembly.
6. Go/no-go gauge measurements valid on hot or cold carburetor.
7. Carburetor maximum height measured from bottom of carburetor base to machined horizontal gasket surface of block will be 7" in both front and rear of block.
8. Carburetor modifications permitted are listed below. Any other modification not mentioned is not legal.
9. Holes drilled in the throttle plates for proper idling.
10. Drilling, tapping and plugging of unused vacuum ports.
    • Welding of throttle shaft to linkage arm.
    • Drilling of idle or high speed air correction jets.
    • Milling of center carburetor body metering block surface maximum of .015" on each side.
    • Removal of choke plate and shaft.
    • The jets may be changed as needed.

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Ignition:

1. Ignition boxes must be mounted under hood, not in cockpit. They must be easily removed for inspection! NOTE: Speedway Management reserves the right to exchange or confiscate ignition boxes at any time.
2. Traction control devices are not permitted. Traction control devises that use the brakes are also illegal. Violators will be suspended from competition for up to one year. Length of suspension to be determined by Speedway management.
3. Ignition boxes must remain as manufactured with no internal or external alterations. No crank trigger ignition systems permitted! Ignition must be mechanically driven in the stock position.
4. One ignition coil and one ignition box (amplifier) permitted on the car. Only one spark plug per cylinder is permitted.
5. Wiring must remain as designed by box manufacturer.

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Lubrication System:

1. Dry sump system permitted.
2. Oil may be in a steel pan only.
3. Oil pan must have 1" inspection hole for connecting rod verification on left side of pan. You will be asked to remove oil pan if no inspection hole is present!
4. No external oil pumps permitted. NO vacuum pumps!
5. No Accu-sumps are permitted.
6. Oil coolers are permitted.

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Fuel:

1. Only race fuel, pump gas or alcohol permitted.
2. No nitrous or any other additives are permitted.
3. All fuels subject to random testing at the track.
4. Fuel pumps must remain in and be driven as stock OEM equipment.
5. No electric pumps are permitted.

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Design by Regina Birdsall, Last Updated Saturday, 15-Jan-2011 05:06:13 CST