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Exhaust questions

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Old 09-10-2005, 01:00 AM
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Default 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?
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Old 09-10-2005, 08:02 AM
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Default 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.
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Old 09-10-2005, 08:26 AM
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Default Re: Exhaust questions

Quote:
Originally Posted by havasu fun
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?
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.
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Old 09-10-2005, 08:57 AM
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Default Re: Exhaust questions

Quote:
Originally Posted by havasu fun
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?
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!!
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Old 09-10-2005, 09:12 AM
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Default 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
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Old 09-10-2005, 12:35 PM
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Default Re: Exhaust questions

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