Exhaust
Freshman User
Joined: Feb 2004
Posts: 30
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1990, 302 complete rebuild. Cam to shift the power down rpm as much as possible. Otherwise stock. Well, 30 over bore. Engine back, what should I do. Help is appreciated.Ted
Last edited by ted368; Oct 28, 2004 at 08:38 PM.
Elder User
Joined: Jul 2004
Posts: 757
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From: Fredericton NB, Canada
Short headers will bolt right up. You should exchange the two stock cats for one high flow cat. The muffler is up to you, you should choose a free flowing one, the different brands are innumerable. Depends on your price range and sound preference. Ask around to guys in town to see what they have. I would go with 2 1/2 inch tubing front to back with a high flow y pipe seeing that you have a pretty much stock 302. This is of course my own personal opinion, others will vary.
-Matt
-Matt
Cargo Master
Joined: Aug 2004
Posts: 2,899
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From: Lynnwood, WA
Originally Posted by Redbob
The difference in the mufflers is that the one for the larger engine has lower flow resistance. So on the smaller engine, the 302, there'll be less backpressure than with the 302 muffler.
Last edited by aurgathor; Oct 29, 2004 at 12:45 AM.
New User
Joined: Oct 2004
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Originally Posted by MatthewC
Hogwash. The y-pipe, exhaust diameter, and muffler were the same on the 302 & 351 Bronco's
-Matt
-Matt
The aftermarket manufacturers don't bother producing both because of initial tooling costs for the different mufflers. It's cheaper to have one muffler cover both applications.
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New User
Joined: Oct 2004
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Originally Posted by MatthewC
Actually, I have a 351 in my Bronco, and it came from the factory with a single tailpipe, and came with 2 cats that have since been removed.
-Matt
-Matt
Anyway, my point was that there are different factory exhausts for the 302 and 351 (at least for some years), but none of the aftermarket manufacturers seem to bother making both.
Senior User
Joined: Oct 2001
Posts: 268
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From: North Texas
Originally Posted by MatthewC
Hogwash. The y-pipe, exhaust diameter, and muffler were the same on the 302 & 351 Bronco's
-Matt
-Matt
Better to keep your mouth shut, and let people think you're foolish, than to open it and prove them right.
Senior User
Joined: Oct 2001
Posts: 268
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From: North Texas
Originally Posted by paulm1967
Anyway, my point was that there are different factory exhausts for the 302 and 351 (at least for some years), but none of the aftermarket manufacturers seem to bother making both.
And if you select the parts listed for an '87 EFI Bronco, you can get dual tailpipes with chrome tips as well as the matching dual-outlet muffler.
Regards,
- R
Senior User
Joined: Nov 2002
Posts: 133
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From: North West, New Mexico
Also, don't forget that there is a possibility that you may lose HP. When the exhaust gases cool, it is harder to move. With duels, especially 302's, the gases may cool too fast and rob you of HP. Alot of "Ricers" out there haven't learned this concept.
New User
Joined: Oct 2004
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Originally Posted by Redbob
You're right that the 302 and 351W had different mufflers from the factory, but Walker still makes different service mufflers for the 351W and 302, in their "Quiet Flow" line of premium replacement exhaust parts.
And if you select the parts listed for an '87 EFI Bronco, you can get dual tailpipes with chrome tips as well as the matching dual-outlet muffler.
Regards,
- R
And if you select the parts listed for an '87 EFI Bronco, you can get dual tailpipes with chrome tips as well as the matching dual-outlet muffler.
Regards,
- R