87 bronco 4.9 engine
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87 bronco 4.9 engine
hi i have a 87 bronco with a 4.9 6 cyl in needs to be rebuilt can anyone give me tips on any high perfonmance mods i can make and where i can get the parts and what other year engines will fit thanks jerry
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Fleet Mechanic
Joined: Jul 2004
Posts: 1,988
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From: Travelers Rest SC
If you're going to stay w/ the 6, I think all years will fit; it depends on if you're gonna go EFI or carb. Cruise down to the inline six forum, and search for performance mods. It's a hot topic- lots of info. I know for a carb set-up, most guys go with an Offy 4 bbl intake (JC Whitney, Summit, most perf. catalogues), about a 390 to 450 cfm carb, cam, and the later dual EFI exhaust manifolds (or headers). Usually some head porting is in order. As for EFI mods, you'll have to talk to someone younger than me!
Tuned
Joined: Jul 2004
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From: Jersey Shore
Well it all comes down to 1 thing,money. I have a carb'd block and have seen guys port the heads, put cebby valves in, roller rockers, deck the head, bore the cylinders, put in a mild to wild cam, dual header, offy intake. As for efi, at least the cam and roller rockers maybe larger injectors, but then i think some computer work is needed, but im not positive.
Lead Driver
Joined: Sep 2002
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From: Gateway to the West
Originally Posted by Bronco308
The best performance mod you can do to the 4.9L/300cid is replace it with a 5.8L/351W. That is what I did when the 300 in my '83 Bronco died at 210,000 plus miles. It's never ran better!
More Turbo
Joined: May 2002
Posts: 594
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From: Wetumpka, Alabama
Originally Posted by greystreak92
I will beg to differ with you on this one. The 4.9l (300 c.i.d.) I-6 is a virtually indestructable powerplant. It was designed as a TRUCK engine.
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Post Fiend
Joined: Mar 2002
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From: Bonita Springs FL
Greystreak is spot on - as usual. 
Stick with the 300. Going to a 351 is not much of an upgrade.
Stick with the 300. Going to a 351 is not much of an upgrade.
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From: reno
What will you doing with this thing? If it's a Bronco it should be 4wd so its not a drag car anyway. The most I would do on the engine is cam and port it for what you want to do and match it to your RPM happy zone. A stock bottom end will handle these upgrades. I want the power way low but I don't do great on the highway (I'm runnin 38s). Basic mods will keep this torque monster happy for years while you add the bolt-ons for reliable power :intakes, exhaust, pullies, carbs, ignitions, injectors, chips, gearing........... money, money, and money.
Good luck.
Good luck.
Mountain Pass
Joined: May 2005
Posts: 101
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From: Iowa Park, TX
Sorry to have ruffled all those 300cid feathers. My 300 had 210,000 miles on it when it died; there is no denying that it is a tough engine. But I now have 96,000 on the 351HO I replaced it with and it is still running strong. Will I get 210,000 miles out of it? I don't know yet and neither do you.
Having had BOTH engines in the SAME vehicle for quite a few miles, I stand by my original statement. I am much happier with the 351.
Oh yeah, the original C6 transmission just died; 300,000, or there about, miles.
Having had BOTH engines in the SAME vehicle for quite a few miles, I stand by my original statement. I am much happier with the 351.
Oh yeah, the original C6 transmission just died; 300,000, or there about, miles.
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Joined: Jan 2004
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From: Cameron, OK
Is the 87 carb or EFI... if it's carb a cheap upgrade is to use an adapter and spacer plate and run a 2bbl carb on the stock manifold. then change the ignition over to a duraspark 2... that will give you all the power you need really. That's all I've done to mine and it has more than enough torque to break stuff... frequently.
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