Ok so i bought a lm7 from the junkyard a year ago. the lifters in it look diffrent than the ones i have seen. Is this a stock lifter that gm used or are they aftermarket? they have 5g1 stamped on them and the only ones i can find that look like that are from howard cams or comp.

 

 

the motor was out of an avalanche and it was drive by cable. im not sure the year i may have an old bearing i can look at and see.

 

main and rod bearings say 8-01 on them.

 

is there any way to tell if the cam is aftermarket at home?

 

Does it have a non-stock sounding idle?

 

To be honest ive never heard it run. the block is at the machine shop getting cam bearings. the lifters have been sitting in a tuberware bowl full of atf for a year. i am rebuilding a lq4 for a 2500hd i just bought and just happened to.look at the lifters tonight.

 

See if someone nearby has a CamDoctor. Or send the cam to someone who does. It will tell you everything about it.

 

it cant be to special, im pretty sure it has the stock springs

 

Not saying you're wrong, but single beehive springs are available in lifts up to .625. So....

 

you know i think you might be right. these springs do look a little diffrent than the ones on my 317 heads

 

ok so the springs out of the.5.3 are on the right. they have a yellow stripe, they are a little shorter. left are lq4, they have a green/blue stripe.