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1988 F150 300 top end rebuild

Moderator: Mod Squad

Jhow2019
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1988 F150 300 top end rebuild

Post #1 by Jhow2019 » Fri Jun 07, 2019 6:20 am

My old truck is entirely stock. EFI, smog pump, even the little fan that blows on the injectors, etc. Me and her have done a lot of work in our time together and she's never let me down once. I plan on treating her with a top end rebuild and ditching all the smog junk and maybe even an electric fan.

But the most controversial plan in my head at the moment is adding a small cam and doing a homemade port/polish. From what I've read on here I would be better off ditching the EFI but thats really not in my budget. Are the cams that work with EFI even worth spending the extra $400-500 on for cam, springs, retainers, timing gears, etc.? Would i even notice the extra HP?

Harte3
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Re: 1988 F150 300 top end rebuild

Post #2 by Harte3 » Fri Jun 07, 2019 10:19 am

All the systems on the EFI computer controlled engine have to be working properly for the engine to run properly. If you remove the smog equipment and the sensors that go with them you most likely will be replacing them with a lot of grief.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

pmuller9
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Re: 1988 F150 300 top end rebuild

Post #3 by pmuller9 » Fri Jun 07, 2019 11:01 am

As Harte3 said, all sensors and equipment must remain in operation for the EFI system to work properly.

If you add a small cam that has less than the stocks cam's 268 advertised duration you will have problems with detonation and would end up having to use premium octane gas.

The Schneider 135H (13919) cam will work if installed straight up.
The specs are .472"/.472" 214/214 270/270 110deg
This will also give you the opportunity to replace the fiber timing gear with a metal gear set.

You will want to replace the old valve springs with the Comp 903 springs which are close to the same spec as the stock spring.
Along with the spring replacement you need to find six stock intake retainers to replace the exhaust rotator style retainers.

The engine torque will be increased from an idle out to 3500 rpm.
The stock EFI system may not support power beyond 3500 rpm.

Jhow2019
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Re: 1988 F150 300 top end rebuild

Post #4 by Jhow2019 » Sat Jun 15, 2019 5:39 pm

So what’s the most common way to make power? Remove the EFI for carb?
My state no longer requires emissions testing, especially for cars pre 95.

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THE FRENCHTOWN FLYER
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Re: 1988 F150 300 top end rebuild

Post #5 by THE FRENCHTOWN FLYER » Sat Jun 15, 2019 6:56 pm

Best bang-for-the-buck: Low restriction exhaust system
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Max_Effort
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Re: 1988 F150 300 top end rebuild

Post #6 by Max_Effort » Sat Jun 15, 2019 7:26 pm

How many miles are on this engine?

How are the wear indicators such as: oil pressure, oil consumption, blow-by, compression test, leak down test?

pmuller9
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Re: 1988 F150 300 top end rebuild

Post #7 by pmuller9 » Sat Jun 15, 2019 10:07 pm

Jhow2019 wrote:So what’s the most common way to make power? Remove the EFI for carb?
My state no longer requires emissions testing, especially for cars pre 95.


That depends on how much more power do you want?

The cam change I suggested will increase the low to midrange power.
Beyond that it gets much more involved and costly because the cylinder head would need to be modified for better airflow.
Then you would have to choose between an aftermarket EFI system or go to a carburetor and intake manifold set-up.

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