Pure Stock Drag Racing tips & tricks - Page 14

Rowdy Rat · #**131** 10-01-2003, 01:26 PM

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Would be cool to get an "early LT-1 cam" on a cam doctor see what's up.

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Rob & Sam,

Perhaps my first post on this subject was unclear, but this is exactly what I did. Like Sam, I was convinced that there was a difference between the original specification LT-1 camshafts and what Crane was providing to GM. In an effort to prove that theory, I had three cams checked on Jere Stahl's equipement... Cam #1 was an original cam removed from a 1970 LT-1 Corvette at 1,600 miles (I fully intended to use this cam in my own engine). Cam #2 was an original cam removed from a 1970 LT-1 Corvette at 67,000 miles (my own car). Cam #3 was a Crane supplied GM cam purchased a few months before it was discontinued.

After spot checking several intake and exhaust lobes, what I finally ended up proving was that all three were identical (there was some reduced lift on Cam #2, but I attribute this to it having 67,000 miles on it)... There was no difference between the original 1970 LT-1 camshafts and what GM was selling over the counter in 2000-2001.

I would fully expect an original 1971 LT-1 camshaft to be identical to the 1970 version. I would love to check a 1972 LT-1 camshaft though... Just to see if GM carried through the entire LT-1 production run with the same camshaft. My guess is that they did, but I'd still love to prove it just to satisfy my curiosity.

Regards,

Stan Falenski

**Salvatore** · #**132** 10-01-2003, 01:37 PM

Hey Stan, I think it would be a good idea to buy a crane spec for your car and sell me the used LT1 stick with 1,600 miles on it. [img]/ubbthreads/images/graemlins/smirk.gif[/img] [img]/ubbthreads/images/graemlins/biggthumpup.gif[/img] Thanks, Sam

**Salvatore** · #**133** 10-01-2003, 01:40 PM

Put it in, it is probably faster than the crane. [img]/ubbthreads/images/graemlins/

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COPO PETE · #**134** 10-01-2003, 05:22 PM

With all due respect fellas...... Rowdya Rat has done his homework. Stock specs are stock specs. I think the seat of your pants has a hole in it!
Peter [img]/ubbthreads/images/graemlins/grin.gif[/img]

**YENKO DEUCE REGISTRY** · #**135** 10-01-2003, 05:48 PM

I'm a young-timer, so I'm going with Stan's research and results. Crane it will be, and we'll take it to the track in the spring [img]/ubbthreads/images/graemlins/headbang.gif[/img]

**Salvatore** · #**136** 10-01-2003, 06:05 PM

Good going Marlin! That is the way to put it to rest! [img]/ubbthreads/images/graemlins/biggthumpup.gif[/img] [img]/ubbthreads/images/graemlins/

[/img] [img]/ubbthreads/images/graemlins/burnout.gif[/img] Sam

Allen · #**137** 10-01-2003, 06:09 PM

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Good going Marlin! Is Day-2 beginning to rub off on Ya? [img]/ubbthreads/images/graemlins/biggthumpup.gif[/img] Sam

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Marlin,
Does this mean that you're going to put those whitewall tires on the shelf too?

[img]/ubbthreads/images/graemlins/burnout.gif[/img]

**YENKO DEUCE REGISTRY** · #**138** 10-01-2003, 08:27 PM

Nope!! The whitewalls are staying on, so are the Yenko wheels.

I really don't care for the Atlas style wheels on the gobi beige, so my polyglas tires are off the mags and are going on my '69 SS Nova with steel wheels and dogcaps. I just got the rallye green paint matched today for those wheels, anxious to weld, grind and paint something [img]/ubbthreads/images/graemlins/grin.gif[/img]

Chevy454 · #**139** 10-01-2003, 09:06 PM

Call me slow, but...I still don't see how two identically spec'd cams will run differently? [img]/ubbthreads/images/graemlins/dunno.gif[/img] Does your engine guy have a dyno? That would prove/disprove a lot of this, and is calibrated and repeated, as opposed to the seat of your pants! [img]/ubbthreads/images/graemlins/grin.gif[/img] I've been on a LOT of passes where I would have swore I was on a low 12 second pass, only to get my time slip and have it say 13 something!

**Salvatore** · #**140** 10-01-2003, 10:07 PM

Rob, You are not slow. I am just telling you my experiences over the last 33 years. Lift, duration, lobe center are one thing, but ramp speed and how it is degreed is another thing.I am not sure all the spec cams are really to spec. I just feel that the early 302 cams and the LT1 cams are better than the aftermarket (spec) grinds of today. We don't have to agree on this. I am just telling you from my experiences. None of my motors were on the dyno. Maybe cams are like carbs, there are no 2 alike. Just ask Jerry MacNeish, or any Stock, Super Stock guy. I am not really unhappy with my crane cam, I just like the chevy's performance better. Sam [img]/ubbthreads/images/graemlins/dunno.gif[/img]