hi
can you give me alot more details like
what the car was like before head work
who done the work
who fitted the head
is the timing set right
was fueling adjusted

before we go any further its like this
when you fit a new cam and lifters you have to bed them in on startup you rev the engine and hold it at at least 2.5k revs for 20 mins
you must not let it sit at idle on the first start up , has this been done
the more info you can give me and everybody else will help us to help you
mark2