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Old 01-10-2012, 10:30 PM
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restricted circle track motor

I've got me a 89 vette block bored .30 over with a nodular crank 3.48 stroke there restricting the motors to 2 barrels and 9:1 compression. I have a set of stock vortec heads im gonna take to the shop just dont know which way to go to run 7000 rpm every week with 400hp. Heres the rules and let me know what you guys think.

.5 mile track
5.83 rear gear with direct drive glide




1) All block, cylinder head, exhaust manifold, and intake manifold casting numbers shall be verified/validated and traced to stock factory part numbers/casting numbers except as noted.
2) All block casting numbers shall be verified/validated and traced to stock factory part numbers/casting numbers and/or OEM replacement casting numbers. No aftermarket blocks. Must be OEM Cast Iron Blocks. GM approved block numbers are: 3892657, 3914660, 3914678, 3932388, 3932386, 3956618, 3970000, 3970006, 3970010, 3970014, 10066033, 10066034, 10066036, 10243880, 10066098, 10105123. 14010207, 14010209, 14010287, 14016376, 14016379, 10054727, 14088528, 14088548, 14088552, 14093638, 14101148. FORD and CHRYSLER - Any OEM production block. No GM Bowtie, Ford SVO or Chrysler W components allowed. Engine casting numbers cannot be altered.
3) No porting or polishing any engine component. No titanium engine parts.
4) No Aluminum, Titanium, or Carbon-Fiber components allowed.
5) Atmospheric conditions and equipment limitations suggest a .3 tolerance in compression limit. Therefore, compression measurements greater than .3 over compression rule means disqualification.
6) Screw in studs are allowed, push rod guide plates are optional, no stud girdles.
7) No fuel injection, turbo combustion's, and diesels.
8) Maximum cubic inch is 363 for GM, 364 for Ford, 370 for Chrysler.
9) Cannot alter lifter bores.
10) Oil splash plates under the valve covers are allowed.
11) Stock rods or aftermarket rods are approved. OEM or OEM replacement steel rods only GM 5.7 or 6-inch rod allowed. Cap screw allowed.
12) OEM or OEM replacement steel crankshaft only - cannot be lightened. No aero wing, bullnose, knife edge, undercut or drilling of second or third rod throws.
13) Steel oil pans only. Racing oil pans allowed. A 1-inch inspection hole with screw-in type plug required in middle of oil pan above the baffling assembly for inspection of rod and crankshaft throw.
14) Steel roller tip rocker arms allowed.
15) Camshaft limited to hydraulic or flat tappet (solid). No mushroom or roller lifters allowed. No roller cams allowed. CANNOT ALTER LIFTER BORES.
16) Aftermarket pulleys are allowed.
17) Stock mechanical water pumps with fans required.
18) OEM firing order cannot be changed. (GM: 1-8-4-3-6-5-7-2).
2012 Lakeside Speedway Factory Stock Rules
Page 3 Factory Stock
19) Engine must be located no further back than where the #1 spark plug is even with the front ball joint. Aftermarket engine mounts allowed, including mid-plate.
20) Engines must be within same corporate line as body. (G.M. to G.M., Ford to Ford, Chrysler to Chrysler).
21) Radiator must remain in stock location with overflow vented to the ground between the frame rails. Aftermarket radiators allowed.
22) Wet sump oiling system only. Accumulator allowed; cannot be located between seat and door bars.
23) Flat top or dished pistons only, no gas-ported pistons
24) May use oil restrictors.
25) Oil pump must mount in stock position.
26) Stock stroke for block.
27) INTAKE: Unaltered, approved OEM cast iron low rise, two- or four-barrel. Only unaltered (no porting or polishing) aftermarket aluminum intakes allowed are: Weiand GM #7547-1; Ford #7515, #8023 or #7516; Chrysler #7545; Edelbrock GM #2701, #2101, #7104, and Vortec only - #2116; Ford #7121 or #2121, #7181, #7183; Chrysler #2915 or #2176. Cooling lines allowed on aluminum intakes.
28) 9.1. to 1 Compression Engines: HEADS: Steel only. Must be unaltered approved OEM.
aa. Those who use VORTEC heads (casting numbers 12558062/10239906 only) must use the Edelbrock 2116 SBC VORTEC Performer Intake.
bb. Those not using VORTEC heads will be required to use OEM heads with casting numbers verified/validated and traced to stock factory part/casting numbers and may use the Edlebrock 2101 or 7104 Performer RPM Q-Jet Intake Manifold or other stock factory automotive intake manifold that can be verified/validated and traced to a stock factory part/casting number.
cc. Those who use the Magnum heads (casting/part number 53006671/53005723 only) may use the MOPAR Performance Aluminum Intake (part number 5007381) or other stock factory automotive intake manifold that can be verified/validated and traced to a factory stock part/casting number. Those not using the Magnum head will be required to use OEM heads with part/casting numbers verified/validated and traced to stock factory part/casting numbers."
29) Additional Engine Option: HEADS: Steel only. Must be unaltered approved OEM
aa. No compression rule.
bb. Minimum 70 cc combustion chamber. Only GM OEM approved head numbers are: 14079267, 3986336, 3986339, 3986339X, 3986388, 3932441, 376445, 3928454, 3932454, 3876487, 3973487, 3973487X, 3973493, 3951598, 468642, 330862, 333882, 3998920, 3998991, 3998993, 3998997, 3970126. Ford - any OEM production head with inline valves. No canted valves and no SVO heads. Chrysler - any OEM production head with inline valves. No canted valves and no W-2 heads. May use Engine Quest (EQ) Stock Replacement (SR) cylinder head, part number CH350I, head must remain as produced, seat angles and valve sizes can not be changed: three angle valve job only (absolutely no casting removal in valve pocket of EQ head, for any reason). Maximum size valves on these GM heads are 2.02 inch intake and 1.60 inch
2012 Lakeside Speedway Factory Stock Rules
Page 4 Factory Stock
exhaust. On Ford and Chrysler maximum 2.04-inch intake valves and 1.70 exhaust valves. GM - 1.250 inch maximum O.D. valve springs.
3. CARBURETOR.

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Old 01-11-2012, 07:13 PM
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Im not sure if you left a part of the rules out, but under engine option it says no compression rule?
>>>>>>28) 9.1. to 1 Compression Engines: HEADS: Steel only. Must be unaltered approved OEM.
aa. Those who use VORTEC heads (casting numbers 12558062/10239906 only) must use the Edelbrock 2116 SBC VORTEC Performer Intake.
bb. Those not using VORTEC heads will be required to use OEM heads.....
29) Additional Engine Option: HEADS: Steel only. Must be unaltered approved OEM
aa. No compression rule.
bb. Minimum 70 cc combustion chamber.<<<<<<

I see flat top or dish only pistons, but with a vortec (64cc's) you would need a substantial dish in the piston to get to 9 to 1, I build circle track stuff up here and we are 9.3 9.4 to 1 with 70cc heads and flat tops.

I would suggest getting some info from a local, race winning, engine builder and see where he says you should go.

I would imagine based on the engine options, there are weight breaks in play here. GO FOR THE LOWEST WEIGHT, dont worry about horsepower.
You aint drag racing, get the thing to be featherweight and turn, youll make up for the motor, especially coming out.
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Old 01-11-2012, 08:55 PM
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I hardly no where to start with this I so excited. I have a lot to say but no time tonight. So I'll hit a few highlights.

6) Screw in studs are allowed, push rod guide plates are optional, no stud girdles.
- 7/16th screw in studs
- Stepped guide plates

10) Oil splash plates under the valve covers are allowed.
- Yes since you're limited to roller tip rockers that means the good old ball and socket fulcrum. At 7000 RPM these run really, really hot, you want to spend for the best components and use not lots (as in no restrictors) but put the stuff where it's needed which is on the fulcrum and the spring for lube of the fulcrum and cooling of it and the spring.

14) Steel roller tip rocker arms allowed.
- Best you can afford.

24) May use oil restrictors.
-No


11) Stock rods or aftermarket rods are approved. OEM or OEM replacement steel rods only ? GM 5.7 or 6-inch rod allowed. Cap screw allowed.
- 6 inch with a floating pin, more on this later.

12) OEM or OEM replacement steel crankshaft only - cannot be lightened. No aero wing, bullnose, knife edge, undercut or drilling of second or third rod throws.
- Question here; do they mean forged OEM when they say "steel" or is this cast nodular? Forged if you can with 1/8 radius journals, surface hardened journals. Don't use a forging that's been undersized, steel is good stuff but dies not present a good wearing surface without it being hardened. Cast while not as strong has a better wearing surface.

Anyway I'm having fun here but gotta run.

Bogie
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Old 02-19-2012, 05:35 PM
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Ok, take what you have...block and heads and keep them.

You're 9:1 isnt gonna kill you, but gonna make it tough.

Get your heads reworked really good, good guides, screw in studs, guideplates and get a set of isky tool room springs. Get some good valves, ferra lightweights.

Get either a JR motorsports PRC-108 or PRC-106 cam...106 prolly since you're a little down on compression. set it at 2-4 degrees advance.

Dual roller timing set, with a fluid dampner.

I personally would get a scat crank, they make forged cranks that are cheap(er) but crazy strong. Go with scat pro comp rods, the I beams. H beams are not needed with 9:1. Ive ran the pro comps in my 12:1 355 up to 7300+ rpm with no issues.

6 inch rod, floating pins. FORGED pistons, flat tops. Hypers need to be checked prolly once midway through a season and replaced every two seasons or sooner. Have a bad tendency of coming apart.

Good distributor, prolly start with the timing around 34, you could prolly run 36 with the vortecs.

Put that Edelbrock intake on it, builds more torque...pulls out of the corner harder.

Get a Keith Dorton or better carb...the carbs are where you can make up some power. I run a VDL 4412, paid almost 1300 bucks for it...and I'll never get rid of it...I could feel the increase in the power at the end of the straights.



Welll! That should get ya started in a good direction! It should run 7k rpm easy, make around 350-380 rwhp.
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