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post #1 of (permalink) Old 05-25-2007, 10:39 AM Thread Starter
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Exhuast manifolds

I'm trying to finish up my engine swap (304 in place of 258), the guy I got the engine from gave me a set of fenderwell headers and while I would like to use them for the cool factor (looks and sound), I've heard that exhaust manifolds work better (less heat, less maintenance and more torque).

Are all manifolds created equal or are there certian year/model/displacement that I should look for?

I won't be able to get this finished before I deploy, so I'll have plenty of time to search when I get back, not to mention money saved while I'm away.

I could have had a V8
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post #2 of (permalink) Old 05-25-2007, 12:05 PM
 
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Originally Posted by justjim View Post
I'm trying to finish up my engine swap (304 in place of 258), the guy I got the engine from gave me a set of fenderwell headers and while I would like to use them for the cool factor (looks and sound), I've heard that exhaust manifolds work better (less heat, less maintenance and more torque).
I'm not too sure about the manifolds being better than the headers. When I put header(s) on both my Ram and on the TJ, the sound got better and the HP and torque jumped massively. They do get hotter, but a pack of header wrap will take care of that.
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post #3 of (permalink) Old 05-25-2007, 03:13 PM
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Headers do little if anything for the lower half of the RPM range....and most of the rock crawling I do uses about the first 25% of my RPM range....

Having had headers on some other vehicles....it's unlikely that I would ever do it again unless I just had to have the power. It's just not worth the maint, leaks, lack of room and rusty look (after a few years).

On a side note....many many years ago I had a 67 Camero RS convrt....SBC 327....with headers....ran the 1/4 in 13.7 sec and got 20 MPG (if I kept my foot out of it). I got tired of the noise from the headers and put on a set of good ram head exhaust manifolds. not only could I now hear what the engine was doing (like vacuum leaks), i also had a lot more power...top end was about the same but much more power on the low end. Before it would only spin the tires a little...with the manifolds it would smoke them all the way through 1st gear.

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