Ordered exhaust
#1
I finally got the house back together after 3 years from a tornado and now just ordered stainless exhaust. I wanted stock manifolds and couldn't find anything on the inter web that breathes good enough 2 1/2 I'm guessing so I ordered tri y headers and flow master stainless exhaust.
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#2
I say make it the way you want it and ENJOY!!! Sound like some good upgrades. JTS
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#3
Thanks I've always liked the sound of flow masters on 5.0 efi
So should be good here too.
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#4
Good to hear your back on your feet with getting your house back together. I am sure it could have been a lot worst.

I like the sound of the Flow Master mufflers too! I don't think you will have any regrets going with tri-y's.

Let us know how it sounds when you get it installed. There should be a noticeable gain in HP with the system you are installing.

Good luck!
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#5
If that is truly a 1969 Mach 1 it would have at minimum a 351W. To the best of my knowledge there are no Tri-Y headers made to fit a 351W. I am fairly certain the 289-302 Tri-Y headers will not fit a 351W due to the taller deck height. Plus I don't think they would flow well enough for a 351W. Probably kill some upper mid to top end power.

Just my preference, I wouldn't use them on a 302 or 289 either. Tri-Y's are designed to increase low end power. A 289 and 302 has a short stroke so are really not a low end power building motor. For small motors like that with a short stroke, I would build them for mid to upper RPM power. For low end power, start with a larger CID motor with a longer stroke.

If you are concerned about header clearances, look at something like a mid length header from JBA. Some call those JBA headers short and some mid length. However, they are longer than the typical short header that are a bolt on replacement for exhaust manifolds.

I agree, Flowmaster mufflers have a nice sound. Do some research before selecting, many will have a lot of interior resonance noise and get annoying after a while. That's the only reason I went with Borla mufflers. Well, that plus I didn't want my Mach 1 to sound like every Camaro running around my area.
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#6
Keep us posted on your progress!
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#7
(08-02-2017, 07:16 AM)1969_Mach1 Wrote: If that is truly a 1969 Mach 1 it would have at minimum a 351W. To the best of my knowledge there are no Tri-Y headers made to fit a 351W. I am fairly certain the 289-302 Tri-Y headers will not fit a 351W due to the taller deck height. Plus I don't think they would flow well enough for a 351W. Probably kill some upper mid to top end power.

Just my preference, I wouldn't use them on a 302 or 289 either. Tri-Y's are designed to increase low end power. A 289 and 302 has a short stroke so are really not a low end power building motor. For small motors like that with a short stroke, I would build them for mid to upper RPM power. For low end power, start with a larger CID motor with a longer stroke.

If you are concerned about header clearances, look at something like a mid length header from JBA. Some call those JBA headers short and some mid length. However, they are longer than the typical short header that are a bolt on replacement for exhaust manifolds.

I agree, Flowmaster mufflers have a nice sound. Do some research before selecting, many will have a lot of interior resonance noise and get annoying after a while. That's the only reason I went with Borla mufflers. Well, that plus I didn't want my Mach 1 to sound like every Camaro running around my area.

Good point on correct engine size and valid suggestions on choosing the right header for your application. Personally, I like the tri-y's for the 289's and have no complaints on performance. Plus from a fitment perspective there was has never been a real issue.
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#8
I agree, a Tri-Y on a 289 or 302 definitely fits better. More so, if you want to use factory power steering. I just remember reading articles on how they are designed to increase low end power. I'm sure they will help some upper RPM power over a stock exhaust manifold as well. But not as much upper RPM power as full length 4 tube headers.
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#9
It sounds like I might have a good opportunity to experiment with the full length 4 tube headers on my Fairlane. I am pretty certain the tri-y's my friend gave me to try out will not work. However, if they do it will save me a few hundred bucks.
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#10
I think the Fairlane should have 4 tube full length headers. Don't even consider the Tri-Y's. Something like the Hedman Elite series are a pretty good off the shelf header.
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