2 exhuast leak stories, neither w/happy endings:

(1) @ heads - when I put in my LT1 cam and new intake etc., I thought I'd change from paper (came w/headers) to copper exhaust gaskets so I wouldn't have the future leak problems I've read about with the paper gaskets. I also put in Stage 8 locking bolts. Leak city. I got the round port copper gaskets, but it looked to me like my heads (L03 stock) were more square than round, so I figured that's why. So I just put in Percy's aluminums today - still leaks... what's the deal??? the dang paper gaskets worked fine, now I'm screwed and out $80!

(2) @ collecter-to-header flange: these leaked almost from day one (I may have over-torqued them a bit initially). When I changed to copper on the header gaskets, I went copper on these, too. They still leak. The psgr side unbolted itself (yep, all three bolts). And no, I didn't forget to tighten them... I put it back together with new bolts, but guess what? The rattle I've been hearing recently wasn't just from the first-loose-then-unbolted (read "loud, like open headers") flange -- no, there's something inside the pipe, forward of the cat!! I suppose it's either a chunk of my Catco's honeycomb interior or that rocker arm nut I never found when I replaced my springs while my headers were off. I fear it's probably the nut. How bad is it to have a nut rattling around in there (besides the annoyance)? Will it slowly but surely demolish my cat's internals. I am not looking forward to taking off the stinkin header again...

Bedtime for me.

 

I was told we have circle ports, only the hi perfo motors have square, and I don't consider an L03 hi perf.

 

We have circle ports. Some heads are D ports, but if you have the stock 187 L03 heads, then use round port gaskets.

 

to fix your collector leaks,, go here .... headerhush.com

 

that link isnt working..... just type it in.