Thread: Small block race motor odd problem

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I am going to run the hell out of this motor and see what happens. When my idiot light comes on ( which is has been only 2 different times ) i will continue to exit the track. I manage to trick my wife into thinking I need that forged crank and H beam rods. but if i start throwing them out the side of the block she might stop believing me. this motor has a race balance on it and at 7500 rpm's you cant even tell your running it hard. aside from the wife complaining of cost, i would hate to gernade it. It runs awsome. Has anyone else had success, or experience with the 4/7 swap cams? so far i love it.

yes some of my customers run 4-7 swap. i hope to get one for my car soon. looking at that ls1 race cam firing order you have to use the lsm core for this cam big $$

I am a little rusty, and newly signed up here. But my new GTO has got me back to the "good ole days" of chevy 350's.

Can you find any problem with the shaft length? It may be slipping out of position (off the gears from the cam). When you open the distributor cap and push on it with a screwdriver and get oil, it sounds like the shaft is simply not engaged somehow during initial startup and first hard run. Viscosity of the cold oil may be forcing the pump shaft up. As the oil heats and thins, the pump doesn't work as hard and the shaft stays down.

I haven't looked in my motor yet, so I don't know if I'm even making sense. Sorry this is coming from 20 years ago experience on my '78 four bold main crate motor. I had the same problem, but the shaft actually disconnected from the pump head. Froze my engine because I didn't believe a brand new motor was reading zero oil pressure.

ok, an update on this. i change the oil every race on this motor. After i posted this i hit something on the track that put a dent in my oil pan. I pulled the pan and hammer and dollied it back to strait. In the mean time there was a chunk of metal on my magnetic drain plug. about 1/8" x 1/8". I decided to tear into the motor and find out what it came from. It did not come from anything inside my motor. My thoughts are that it was lodged in there from a previous blow up? Not Knowing the history on the block. The oil pressure problem has been gone for 9 races now. I have been jetting this baby down and leaning it out. So far the temp is 200 after a race ( perfect ) and this thing just flat screams. 7700 RPM's all day long. and it packs the left front tire off the ground all the way down the straitways.

EXACTLY!!! thats what i tell all these bird brained kids who tell me to put "subs" and "dubs" in/on my car. what a bunch of jackoffs. man my generation is ass-backwards OK enough soapboxing ill get down!

Originally Posted by pat mccarthy

my engine is my radio