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#1 |
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[QUOTE=X-TECH MAN;195663] That would eliminate just about every NHRA car that wanted to cross over and the car counts are low enough already.
I think that you'll find that NHRA doesn't want Stockers "crossing over" to SS!
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Billy Nees 1188 STK, SS I'm not spending 100K to win 2K |
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#2 |
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[QUOTE=Billy Nees;195742]I meant if the NHRA stockers wanted to run IHRA stock....... If IHRA changed the valve spring rule to a max seat and open pressure for stock IHRA would loose ALL of the NHRA stockers wishing to race with them unless they ran S/S because of the NEW valve spring pressure rule. .
Last edited by X-TECH MAN; 07-02-2010 at 01:56 PM. |
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#3 |
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I am with you guys on this one. The current valve spring rule was the most expensive hit NHRA has done to Stock Eliminator racers. I agree with you, Terry, that if they would set a max of say 135-140lbs on the seat and 350 or so at .500" compression the cost of an engine would decrease, the reliability and down-time would increase and the smart guys would have another avenue to snooker people with.
If someone would start a referendum, maybe we could exert some pressure on them. Lots of people would benefit. |
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#4 | |
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#5 | |
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They already have Super Chevy races Do you want to make them all that way?
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Art Leong 2095 SS |
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The 69,70, 71 Street Hemi had single springs with a damper at 150 lbs on the seat and 320 open pressure specs. I have my old NHRA/IHRA engine spec book right in front of me as I type this. The 68 Street Hemi had 131 lbs on the seat and 280 open. The 66-67 Street Hemis had dual springs with the rating of 114 lbs outer and 53 lbs for the inner spring on the seat with 189 lbs outer seat pressure and 96 lbs for the inner open pressures (add them together) with solid lifters.The 68 and 69s had solid lifters also while the 70, 71s had hyd. lifters. The 68-71 had single springs with a damper. This was good for 7000 RPM operation. The street Hemis with an OEM oiling sytems and pans dont take to kindly to 8200+ RPM shift points for very long. I would think most all of the brand of engine combos would be OK with 150 lbs seat pressure and about 320 to 350 lbs open pressures unless they are running a cam with square lobes on it. By the way the 1969 440 six pack had a 150/320 lb pressure spec also.
Last edited by X-TECH MAN; 07-02-2010 at 03:46 PM. |
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#7 | |
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I know it was critical. We would set up a motor with stock valve springs put it together and reve it in to 7500 a couple of times. Then pull the heads and change the valves and springs. It was legal to put notches in the piston as long as the motor did it not the machine shop. PS we shifted at 7200 when we were trying to go fast. The only time the motor would go any higher was in the water (once in a while)
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Art Leong 2095 SS Last edited by art leong; 07-02-2010 at 03:45 PM. |
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#8 |
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Just to remind some of you guys the 1969 396/375 and the 427/425 used a single valve spring with damper that had 106 lbs on the seat and 327 lbs open before the 1985 rule change. The max wedge was less than the street Hemi and the Chevy. The 428 CJs really sucked at 97 lbs seat pressure and 298 lbs open. I think 150/350 lbs would handle just about any current stocker running today and the expensive flat tappet lifters would no longer be needed. A new rear gear might be required for those who delite in slinging the snot out of their combos.....lol.
Last edited by X-TECH MAN; 07-02-2010 at 05:53 PM. |
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