i was searching the forum for information on this but, i bought a car with a block guard in it and i have heard of block and cylinder sepration also hot spots on the motor because of them. well my question is that is it worth my time to take it out or should i just leave it in. has anybody had any bad expirences in this area or any info would be helpful thanks in advance

 

i hear there permanent after you put them in
unless you get the block resleeved i guess