There is a slight ticking when the car is under load. More noticeable in lower RPMs (especially when tq converter is locked up) If I put in neutral and rev there is no ticking, throughout all RPMs. What do you guys think the problem could be?

Car is a a 94 formula. Only big mods are LE2 heads, CC306 with Comp "R" lifters... I'm pretty sure the lifters are before the bad batch though.

 

sure its not spark Knock??

 

When it comes to "ticking" I start looking for exhaust leaks. A loose manifold or header bolt can cause a tick. Also, a tick that is much more noticable under load.

 

Thats what my buddy said he thought it was too (exhaust leak). I think i'll end up replacing the header gaskets and do a tune up to see what happens. Thanks both of you for the input!