I have searched and I see something like a 12.5(3) at 109.xx as being stock bolt on record with stock rockers.
Can anyone confirm or deny this?

Thanks.

 

It is common for NHRA Stock Eliminator LT1 powered F-bodies to run mid-ten second ETs with stock rocker arms. They also have stock-size valves, 355 cubic inches, stock compression, stock-lift camshafts, and stock throttle bodies.

 

I was unclear, sorry about that.

 

How do they go mid-tens? I assume outrageously radical cams and weight reductions. I would like to know exactly what they do though.

 

Weight, alot of compression, alot of duration, and I can not believe they are on stock rockers, maybe stock ratio rockers but I dont know for sure. and suspension helps alot too, and they do this with an aftermarket ECM to spin it way past 7k.

 

The basics of Stock Eliminator are:
1. Maximum of .070 over bore (most of the blocks I prepare are between +.040 and +.060)
2. Stock cam lift (.460 maximum intake lift and .449 maximum exhaust lift with any duration or overlap permitted)
3. 3-angle valve job with no porting or grinding of ports allowed. (Intake and exhaust runners are checked for volume at 175 cc on intake and 68 cc on exhaust)
4. Stock compression (combustion chambers poured for minimum allowable cc at 51.9)
5. Stock deck height (.062 minimum allowable)
6. Spec rod/piston (flat top with four reliefs)
7. Stock, unmodified intake and stock throttle body
8. Stock shipping weight plus 170 pounds of driver weight. No gutting of the car allowed
9. Any torque converter
10. Any gear ratio in transmission or differential
11. 3-speed automatic or 4-speed manual shift transmission
12. 9 inch wide slicks
13. Aftermarket ECM with full programming capability allowed
14. Open headers allowed
15. Torque arm suspension required

The obvious advantages are the cam duration, the gearing, and the torque converter. The not-so-obvious items include careful attention to weight distribution, optimum tuning, ring seal, friction reduction in the rotating assembly.

At 3530# on the track, under good conditions, good C/FIA cars run 10.80s. At 3195# on the track, under good conditions, good B/FIA cars can dip into the 10.50s without much trouble. There are several dozen cars in the country that perform at this level.

 

Oops, forgot to mention (since it has been referenced), we are required to use stock rocker arms of the rail tip variety with no guide plates. Poly locks are permitted. Essentially, the compression is achieved with stock combustion chamber cc's, and stock deck height. Weight reduction is tied to factory shipping weights. The excellent torque arm suspension, and the torque converter are important factors. The stock heads and camshafts seem to run out of power between 7,000 and 7,500 rpm so the car is geared accordingly.

 

Those numbers make me feel like a whimp.

It wasn't clear to me if it was stated that they cannot exceed 10.5 : 1 compression. Is this so?

Also, are alot of these guys running bigger stroke than stock?

 

They shouldn't. There is a big difference. We are not modifying the motor at all. Only rocker arms are allowed in the bolton class. No machining or reworking of the motor is allowed.

I'm not sure what the record time is for a 6-sp but as far as I know I have the best "untouched LT1" time for an f-body. See sig. But I did do some weight reduction.

 

I really don't think that anyone who is driving their car on a daily basis should worry about comparing their cars to Stockers. The original question asked was, "How fast can an LT1 be expected to run using stock rockers." Stockers demonstrate that the rocker arm is not the weak link the the ET chain.

NHRA Stock Eliminator racers are indeed a different breed. The cars we run would not do well in a daily driver configuration. They would likely have great difficulty passing an emissions test. The gearing and torque converters are extreme when compared to the internal components of the engine. Short blocks and heads could be described as "painstakingly blueprinted." The numbers that we hang our collective hats upon are related to cam lift, bore/stroke, car weight, and compression. Those are carefully monitored. Exceeding legal limits in any category (as submitted by the OEM when the cars were new) is grounds for immediate disqualification. Most normal people regard Stockers as aberrations while, on the other hand, we have no basis to evaluate times turned with cars that aren't stock in terms of cubic inches, big heads, big throttle bodies, nitrous, blowers, etc. It's really apples and oranges unless someone asks a specific question such as, "...how fast can a car go with stock rocker arms."

c

 

I should build me a stocker and drive it to sonic for the locals to check out!
At this point I would have to add weight among other things, HA!