Easy install, only need one of bolts sent. use only one bolt sent, right side second from front. | Livermore Turf Installation

none so far

Power improvement, especially with off-road pipe that deletes the cats.

This product has terrible welds, bad coating (once it burns off the headers then rusted), and poor fitment (yes they leaked, big time).

The passenger side header was so poorly fitted that the bolt holes were off. Drilling them out a little didn't help at all and had to be returned for another header.

Because of their "slide-in" fitment (from headers to y-pipe, and the driver's side header that comes in 2 parts to go around the drive shaft) they leaked pretty bad. That coupled with the fact that they rusted makes for a crappy exhaust. Do yourself a favor and buy Edelbrock or someone better.

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Replaced them with Edelbrock's 1 5/8 in headers. These are awesome, fit great, had super welds, and don't leak!

The price was right and the fact that it was coated from the factory. the low end tourque was excellent and output was excellent.

The fact that it took MAC almost half of a year to get me my headers. Once I got them they would not fit. The first time that I ordered them I decided to ask if I could put them in without lifting my engin. The said yes it will be no prolbem. I proceeded to spend my evenings for the next two weeks puting in simple headers. I ended up having to cut my wheelwells, trimming my heater core housing, and a few other trims. I also proceded to remake 2 of the brackets that they sent me because the ones they sent did not fit. Bolt on HP my ass. I called them more than once and asked for help. Most time I ended up talking to a person who had nothing better to say to me than "Oh' a 351 you are going to get great low end horse power.

I would recomend Headers I just dont know weather or not I would recomend MAC i guess if you have the abllility to lift the engin out and install them with little pain then I think that you should buy them because the results were excelent.

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I did not use any others but my friend used Hedman and had no prolbems at all other that he kept blowing gaskets. But either are much better than stock headers and much better looking.

Some power improvement over stock. Better plug access. Price.

Construction, stock "coating" is useless.

Anything is better than stock manifolds on LT1 f-cars. I bought mine with Jet-hot coating for around $450, several years ago. If you live in a dry climate, coating isn't absolutely necessary. If you live where roads get salted, or down in the gulf coast where it's humid and salty air, they'll rot out in a year without the coating.

First the bad:

They're only 1-5/8 instead of 1-3/4 diameter tubes. 1.75's will allow much better flow, but of course you'll pay for it. The tubes are all "free floating" - i.e. there's no boss connecting the end flanges (i.e. cyl 1&7) to the middle flange (cyl 3&5). Thus, the heat makes 'em warp. If you take 'em off after using 'em for a year or two, you'll probably have to enlarge the bolt holes to get 'em back on.

Although the tubes are 1-5/8, the ports are more like 1.5 (at best) due to poor welding. Expect to spend some time grinding 'em out to a gasket-match.

On the other hand, they do provide some power over stock, and allow more power to be made later on - just not as much as you'd get with 1.75s or longtubes.

Spark plug access is much, much easier than stock manifolds.

They're OK for someone doing dress-up work (they look much nicer than stock manifolds) and mild power increases, but if you're going to run a blower or nitrous, you'll be happer with bigger headers.

They are decidedly "average"

easy install, only need one of bolts sent. use only one bolt sent, right side second from front

not equal lenght

easy install, only company that had this headed

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no other found