 Converting 1975 exhaust to pre 75 exhaust |
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| Geezer914 |
 May 6 2009, 02:03 PM
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#1
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Geezer914  Group: Members Posts: 1,417 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States 
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How much horse power will I gain by switching out the heat exchangers from a 1975 to the pre 75 dual exit heat exchangers and adding a Monza muffler?
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| SLITS |
May 6 2009, 02:06 PM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
3 - 5 maybe.
Horsepower is not the only consideration though. |
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| maf914 |
May 6 2009, 02:44 PM
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#3
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None
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I backdated the exhaust on my 76 from completely stock to 74 style SS heat exchangers and a Bursch quiet extractor muffler. I liked the result but I can't really say I felt a big increase in power. It may have just been the exhaust note but it felt as if the engine was a bit more lively above 3500 rpm.
I will say that many years ago I tried a Monza 4-tip muffler on my stock 76 heat exchangers. I found it to be too noisy for my taste. At first it was fun but after a couple of months I found I was driving to reduce the noise. I would coast into my driveway because I didn't want to annoy the neighbors. I know, what a wimp. (IMG:style_emoticons/default/laugh.gif) But in less than a year I had replaced the monza with the stock muffler system (had to buy a new secondary muffler which are now NLA I think) and thought good riddance. Several years later when I went to the Bursch quiet I was a little wary, but I found the sound to be reasonable. IMHO, if you go with a Monza just be prepared for some noise. |
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| Drums66 |
May 6 2009, 03:15 PM
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#4
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
I will say that many years ago I tried a Monza 4-tip muffler on my stock 76 heat exchangers. I found it to be too noisy for my taste. At first it was fun but after a couple of months I found I was driving to reduce the noise. I would coast into my driveway because I didn't want to annoy the neighbors. I know, what a wimp. (IMG:style_emoticons/default/laugh.gif) But in less than a year I had replaced the monza with the stock muffler system (had to buy a new secondary muffler which are now NLA I think) and thought good riddance. (IMG:style_emoticons/default/shades.gif) IMHO, if you go with a Monza just be prepared for some noise. [/quote] everytime I drove through Apt complexes........I would set off all the car alarms.....I got tired of that!!!(went back to stock) (IMG:style_emoticons/default/idea.gif) |
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| Jerry75914 |
May 6 2009, 06:01 PM
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#5
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Member Group: Members Posts: 124 Joined: 13-October 08 From: Half Moon Bay, CA Member No.: 9,640 Region Association: Northern California |
I actually just did a 2.0 backdate to my 1975 1.8L. It seems much more lively, and a step or two quicker according to my butt-dyno. Then again, I also had the valves, dwell and timing adjusted at the same time, so it could be a combination of several things. I did notice that it ran much cooler than the stock setup.
Thanks again to everyone at the Sacramento swap meet for setting me up with parts and advice! (IMG:style_emoticons/default/aktion035.gif) |
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