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post #1 of (permalink) Old 01-25-2005, 11:08 PM
coopmack914
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F-250 4x4 w/ 302 problems

I have a 86 F250 4x4 that i bought second hand that originally came w/ a 351w that was replaced w/ a 302 truck engine before i bought it. The 302 was a 2 barrel carbed slug w/ full emissions. I have since installed a 600 cfm holley 4 barrel on an eldebrock air gap rpm manifold, redid the vac. lines since there was no egr provisions w/ the manifold and the low end is non existant. The engine runs great from mid to top end and gets decent mileage. I guess my true question is,is it really worth spending money on headers, cam, redoing the heads or just investing in building the 460 short block that's bored 30 over that's sitting on an engine stand in my garage? I wanted to put the 460 into the f250 once the 302 died but the 302's low end performance really sucks, and only gets worse with a load. thanks in advance.
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post #2 of (permalink) Old 01-26-2005, 02:12 AM
 
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Re: F-250 4x4 w/ 302 problems

460 460 460!!! Don't waste any money on the 302 you will NEVER get the low-end power you desire from the 302. Dump your money in the 460 and for christs sake don't run a holley on it. That will kill the mileage. A properly tuned 750 edelbrock on a 460 in a 4wd f-250 will easily pull off 14/15mpg.
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post #3 of (permalink) Old 01-26-2005, 04:20 PM
 
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Re: F-250 4x4 w/ 302 problems

Yea, I agree. It really makes no sense to have a 302, even bored over/tuned in a F-250. You need to just invest in the 460 and swap it in.
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post #4 of (permalink) Old 01-26-2005, 04:47 PM
 
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Re: F-250 4x4 w/ 302 problems

I have felt your pain. I beefed a 302 up to far beyond it's speed density EFI's capablities and was still left wanting. If you have a 460 sitting in your garage then, by all means, sir, do proceed! You will not regret it. Just take some before/after pics of your face. I imagine they will look similar to that toyota tacoma commercial in which that fellow suffers from adrenalitis. [img]images/graemlins/smile.gif[/img] In all seriousness, I just did what you propose and truely regret the roughly $2500 I threw away trying to make something out of nothing. [img]images/graemlins/wall.gif[/img] There's no replacement for displacement. I now enjoy the bountiful power of a 460 bored 30 over myself and it is a great comfort to me. [img]images/graemlins/thumbsup.gif[/img]

-Scott
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post #5 of (permalink) Old 01-26-2005, 05:22 PM
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Re: F-250 4x4 w/ 302 problems

The only way I would say to build up a 302 is if it's a 5.0 HO out of a mustang and only if its with mass air not speed density. With the HO motor you will see a differance with even the smallest upgrades and starts out with more HP and torque than the regular 302. But if you are looking for MPG than don't bother with a 302. I have an HO motor in my 82 F-150 out of a 89 mustang so it's nice because it's fuel injected, But I only get about 10 MPG and I don't have my lift or 35's on yet. When I can I would like to build my cleveland and put that in but only because I'm not worried about MPG I live close to work and have another car to drive in the summer.
post #6 of (permalink) Old 01-26-2005, 07:27 PM
 
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Re: F-250 4x4 w/ 302 problems

Curt's right. I have a buddy who replaced his stock 302 with a "roller" 302 out of a mustang. Coupled with the 4.56 gears he put in also, he's happy even with 35's. But yes, mass air EFI allows the computer to adjust to upgrades thus letting you enjoy their benefits whereas the speed density EFI just has set values for fuel/air ratios and is easily confused thus working against you if you make drastic upgrades to the cam, for example. But since you already have the 460; it's a no-brainer. And if you're concerned about MPG, I honestly get better mileage with the 460 not even breaking a sweat than I did with the ol' 302 working its arse off. [img]images/graemlins/smile.gif[/img]
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post #7 of (permalink) Old 01-26-2005, 07:28 PM
coopmack914
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Re: F-250 4x4 w/ 302 problems

Thanks a lot for the advice.It is greatly appreciated. Maybe I'll save the 302 for a project car in the future.
post #8 of (permalink) Old 01-29-2005, 08:45 PM
 
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Re: F-250 4x4 w/ 302 problems

hmmm what about a stroker you can get some serious power out of a 347 im thinking about going windsor in my 4runner maybe 393 or 408. but if you already have a bigblock sitting around go for it
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post #9 of (permalink) Old 01-30-2005, 02:52 AM
 
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Re: F-250 4x4 w/ 302 problems

Strokers are great for mustangs and such but why not use a 460 get tons of power at low rpms and keep it reliable?? There is no substitute for cubic inches... I know a guy that has an 80's fox body with a 460 cobrajet heads wieland 8-71 blower dual 4bbls, nos, 4.56 narrowed 9"..You talk about scary!! And he street drives this thing on ocasion.
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post #10 of (permalink) Old 01-30-2005, 01:55 PM
 
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Re: F-250 4x4 w/ 302 problems

man strokers are great for trucks too depends on how you build them
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