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Old 11-29-2013, 01:21 PM   #1
Bornwild
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Default Lt1 cam reground to LT4 hot cam

Hi Everyone, Happy Hollidays. I have a cam that was sent to Delta camshaft to be ground to a LT4 Hot Cam? It is stamped GMPT BC 15-242 pn the inside of cam between lobes. The 17th lobe is ground down to hardly anything. I believe that this is the fuel lobe? Any info would be helpfully. Thanks John
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Old 11-29-2013, 01:22 PM   #2
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Default Cam pics

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Old 11-29-2013, 01:24 PM   #3
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Default Last cam pic

The last cam pic!
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Old 11-29-2013, 01:35 PM   #4
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yes thats for the fuel pump eccentric.
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Old 11-29-2013, 01:53 PM   #5
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Default Fuel pump lobe

So with that being said! Is this going to work with the LT4 SBC corvette engine? I think that the cam was out of a Z28 1995-96 or maybe a Impala? Thanks John.
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Old 11-29-2013, 01:58 PM   #6
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Sure they used electric fuel pumps
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Old 11-29-2013, 06:16 PM   #7
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Default Cam

O.K. Thanks for you help! Happy hollidays John.
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Old 11-29-2013, 07:48 PM   #8
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I would only like to say one thing here. I'm under the impression they can redo duration and lift, but cannot change the lobe seperation angle? Therefore, it is not the exact grinf of the hotcam, because they have a different lsa.
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Old 12-01-2013, 04:11 PM   #9
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Quote:
Originally Posted by MrWillys View Post
I would only like to say one thing here. I'm under the impression they can redo duration and lift, but cannot change the lobe seperation angle? Therefore, it is not the exact grinf of the hotcam, because they have a different lsa.
How can they increase duration? An LT1 cam is something like 203/207 while a hotcam is longer with more lift. 218/228
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Old 12-01-2013, 04:30 PM   #10
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Originally Posted by GREGGPENN View Post
How can they increase duration? An LT1 cam is something like 203/207 while a hotcam is longer with more lift. 218/228
I believe they do it by reshaping the lobe making it slightly smaller, but it's just a guess. Therefore, the valve lash makes up for it.
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Old 12-01-2013, 08:47 PM   #11
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Better off just buying the cam. I imagine they aren't too expensive.
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Old 12-01-2013, 08:52 PM   #12
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I don't know about GENI &II engines, but on GenIII&IV, you have to run longer pushrods to achieve the lift.
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Old 12-01-2013, 09:06 PM   #13
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I don't know about GENI &II engines, but on GenIII&IV, you have to run longer pushrods to achieve the lift.
Quick question, not trying to hijack this thread but what gen is the L98?
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Old 12-01-2013, 09:08 PM   #14
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I don't know about GENI &II engines, but on GenIII&IV, you have to run longer pushrods to achieve the lift.
I believe this just corrects the geometry on the rockers. The cam and the rocker ratio control the lift.
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Old 12-01-2013, 09:32 PM   #15
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Originally Posted by DanielRicany View Post
Quick question, not trying to hijack this thread but what gen is the L98?
Daniel, gen 1 is 1955 through about 2003, or 2008 in boats. gen 2 is 91 through 97 LT1 (gen 2 was a gentle massage and many parts still interchange), and the Gen 3, 4 is 1997 and newer, and is Waaay different. Therefore, the L98 is Gen 1.
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Old 12-01-2013, 09:41 PM   #16
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Okay cool thanks. I was hoping my pushrods could have been part of the reason that I am not getting full power out of my cam but I guess it's just my stupid iron heads. Haha.
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Old 12-01-2013, 09:41 PM
 
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