Exhaust questions
 

I have a 540 inch bbc thats mild,nice heads, 8.8 to 1 comp, 570 lift hyd roller and a single 1050 holley. Right now I am running an eddie marine EMI thunder exhaust. I have heard these are not very good but am I going to get a noticeable gain by changing them. If so which ones do you think would be the best?

Re: Exhaust questions
 

I have a simliar enigne. I built a n.a. 540, makes 680 hp. All good parts, AFR heads, 9.25 compression, .600 lift 238* cam, etc. etc.. Anyway, I originally had Gil WetOffshore exhaust on my 454 Magnum. I put that exhaust on this 540. I ended up with a bad reversion problem. The end result was switching to full dry CMI headers. Problem was solved but gained no noticable speed. Maybe 50 rpm, nothing major.

Re: Exhaust questions
 

You may want to look into Lightning headers, I put a set on my 25 checkmate back in 90 454 with a roots supercharger made a huge performance gain, but becareful you should check the plugs!! will most likly have to go up a jet size or two!!!!!! I have run them on every motor since then, got them on my cat now with 738 HP NA motors.

Re: Exhaust questions
 

Are you located in havasu?? just asking because we have a place in havasu and boat there a few times a year. we live in Michigan (for now) it sure is nice out there!!

Re: Exhaust questions
 

CMI IS THE BEST IVE SEEN , I do have a couple of set that are used if interested email me or give me a call

Re: Exhaust questions
 

YUP......... go CMI