When i first fired my motor it ran pretty good..the valves werent adjusted but i could tell it had good compresison...Id give it a quick little stab on the gas and id hear this massive "spark ping" ...now it wasnt a clap from the rockers,this ping would only happen underload...i drove it around the court i live on to verify this and it pinged like a MF'er...i looked up info and the spark table for the LT1 and LT4 motors to see when all the spark is in by...STOCK these motors run 33 degrees total with 8 degress base and its all in by 2,800....the MSD distributor comes with the slow springs (total is all in by like 4,200) and the 21 degree advade stopper installed....i changed the springs to the Light silver one and a light blue one...(2 light silvers are faster then 2 blues) so this way it would all be in by 2,800 or so..i installed the distributor in EXACLTY te same spot as when i took it out...motor fired right up and i reved it like i did before and the POS still did it..although it didnt sound the same...it sounds more like a mechanical grinding noise...I really beleive i have the timing advande adjusted very close to what the motor needs are far as how much and when its all in, i have not taken it above 4 grand yet so i havent changed the advande stop bushing of 21 degrees...anyway, then i lashed the valves, got the 1/4 turn in and it still made the noise, although wasnt as bad and the motor rumbled a lot more as i went down the bank..
i read up some more and it turns out the the LT1 motors like 1 full turn after lash, some even more..I went out and lashed them one full turn and the motor really got a mean rumble to it..it didnt choke out or start shooting it all out the pipes or anything, it sounded really healthy...once i got them all done i reved like before and it still made the noise but it was alot quiter then before i started with the valves...
when i was doing them only the number 1 intake and 4 intake pushrods were shooting oil out of them, then rest were like a dribble..this was at idle..could one of my lifters or 2 of my lifters be collasped?...

Thanks guys

Rob

 

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