Bornwild

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

Bornwild

Pics

Bornwild

The last cam pic!

cv67

yes thats for the fuel pump eccentric.

Bornwild

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.

cv67

Sure they used electric fuel pumps

Bornwild

O.K. Thanks for you help! Happy hollidays John.

MrWillys

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.

GREGGPENN

How can they increase duration? An LT1 cam is something like 203/207 while a hotcam is longer with more lift. 218/228

MrWillys

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.

DanielRicany

Better off just buying the cam. I imagine they aren't too expensive.

NuckinFutz93

I don't know about GENI &II engines, but on GenIII&IV, you have to run longer pushrods to achieve the lift.

DanielRicany

Quick question, not trying to hijack this thread but what gen is the L98?

bassackwards

I believe this just corrects the geometry on the rockers. The cam and the rocker ratio control the lift.

MrWillys

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.

DanielRicany

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.