i have a 98 blazer. 4.3 vortec the heads blew so i had the heads replaced by someone not a certified mechanic.. first mistake.. but there still is no compression.. it was reading 22 on the first cyclinder. and 25 on the next. not sure if the heads were put on wrong or what. what could cause this again.

 

Posting the same question across multiple forums is prohibited.

Anyone wishing to answer this question may do so here:

heads and compression