LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

305 or 503 which should i do?

Old Jul 6, 2005 | 05:11 PM
  #16  
meangrn94ta's Avatar
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Re: 305 or 503 which should i do?

ok thanks
Old Jul 7, 2005 | 03:30 PM
  #17  
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From: Bedford, TX
Re: 305 or 503 which should i do?

will my car run with a stock tune until i get a tune or not with these cams?
Old Jul 7, 2005 | 10:18 PM
  #18  
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Re: 305 or 503 which should i do?

Mine ran after the hotcam, which is not a ton smaller than these cams.....loped like a bastard on a cold start, but it ran fine, and actually got really good gas mileage.
Old Jul 7, 2005 | 10:35 PM
  #19  
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Re: 305 or 503 which should i do?

Like How Good Of Gas Milage? How Much Lope Did You Get After It Warmed Up? Also How Is Your Low End As Compared To Stock?
Old Jul 7, 2005 | 10:41 PM
  #20  
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Re: 305 or 503 which should i do?

I got good mileage on the highway, bad in city (idle is set too high though). VERY ROUGH idle b4 getting warmed up in winter, not too bad in the summer. It's tollerable, if that's what you are asking.
Old Jul 7, 2005 | 10:49 PM
  #21  
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Re: 305 or 503 which should i do?

How Is Your Low End Power Compared To Stock. I Mean Like Off Idle And Out Of The Hole From A Stop? Can You Still Hear The Lope When It Warms Up?
Old Jul 7, 2005 | 11:28 PM
  #22  
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Re: 305 or 503 which should i do?

The low end power is about the same I guess, it moves the powerband up, but it's still pretty strong down low. The great part is that the engine now pulls really hard all the way to 6500 rpm.

I doesn't lope much at all anymore, because I got the PCM tuned, but when I had the stock pcm in, it would lope very nicely at the cold start, but had a nice wicked sound still when it warmed up. You could definately tell it had been cammed.

Edit: my gas mileage is about 25-26 still on the highway, it didn't really change at all that I could tell.
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