460 Smog Delete and Oil Cooler Delete for a 78 Bronco Swap

[ArdWrknTrk]

Are you towing an RV with an F-350, or driving a 29,000# F53 chassis?

[viven44]

Agreed, that set was bought for “Big Blue 2WD” which is a F350 hauling/towing rig.

[ArdWrknTrk]

Yeah, just do the timing chain.

It will surprise you and launch that little Bronco like someone set it's "tail" on fire.  

[viven44]

Ok well noted and very tempting!!!

[viven44]

Alright Jim, you have convinced me to do the timing set! I'm not understanding why it has to be one from an EFI truck ....

Would you be kind enough to just point me to the set to buy ?

How about a Cloyes set ?

[ArdWrknTrk]

Early* trucks had a hy-vo style chain and nylon cam gear (for noise, but NOT to last. About 75k imo)
Then in '72 emissions dictated the exhaust stayed closed longer, for a more complete burn, and Ford retarded the keyway 4°.(8 crank degrees)

EFI engines run a straight up timing set (crank keyway pointing directly at the cam )
They have a double roller chain from the factory.

Cloyes used to sell a street true double roller for about $45.
Since NONE of these engines have been made in over 25 years they dropped it.
But you can still get a set for '88-'97 that isn't stupid expensive with a whole bunch of keyways you don't need.

[viven44]

Gotcha !! How about this one ?

https://www.amazon.com/Cloyes-C-3079X-Double-Roller-Timing/dp/B001EHBYVC

[ArdWrknTrk]

Don't waste your money on crap you don't need.
When it was 43 bucks, it made sense...

[viven44]

OK how about this one ? Simplest one I can find.... only 1 keyway.

https://www.rockauto.com/en/moreinfo.php?pk=417090&cc=1125043&pt=5756&jsn=993

I can't find a motorcraft one.

[ArdWrknTrk]

There's no application.
I assume 88-97?

[ArdWrknTrk]

Motorcraft don't make engine internals

[viven44]

I tried to also cross-check with a pre-smog (pre 1972) Lincoln 429 and it pulls up the set below C-3079X

https://www.rockauto.com/en/moreinfo.php?pk=904013&cc=1128709&pt=5756&jsn=535

Had no idea that a 88-97 460 used a straight up timing set like a pre-smog era 429

[ArdWrknTrk]

Stock replacement, early, would have been hyvo with plastic teeth on the cam.
So, what's the difference?

The more you know!   🌠

[viven44]

I was wondering what I should do with the fuel pump eccentric, just bolt it back on ? This is an 86 460. I'll be using an electric frame mount fuel pump.

[ArdWrknTrk]

Sure, why not?

It isn't doing any harm in there.

Be sure to get the lowest pressure pump you can find.

460 pumps are speced for a huge amount of fuel! (1gal/min) but most carbs want to see 4psi.

[viven44]

I have bought the Edelbrock 17301, rated for 4-7 PSI. Looks like these pumps like to be mounted at a certain angle, and proximity to tank to reduce chance of vapor lock.

[ArdWrknTrk]

https://www.edelbrock.com/universal-micro-electric-fuel-pump-38-gph-144-lph-gasoline-e85-17301.html

38gph is 2/3 the way there....
But honestly there's no way a 460 could burn through that much fuel in an hour, unless it was making close to 500hp (and WFO) the whole time.

What concerns me is that they say "gravity fed".
You don't want your fuel pump hanging below your tank.
Especially the extra deep tank of a Bronco...

While this could be okay with a fuel cell mounted higher, in a race car, I don't have any idea how this would limit you.

But, I only read the instructions, I don't interpret them or extrapolate from them.

[ArdWrknTrk]

ArdWrknTrk wrote

So, what's the difference?

Both call out "heavy duty" chain.
So, a step below the Street True Roller timing set of old....
The only thing I can think is CI v/s steel gear.

You say it'll be a fun weekend cruiser and not used in anger.
Don't worry about it.....

[viven44]

That is a primary concern for a Bronco indeed. The tank hangs almost above the halfway point of the "pumpkin". The goal is to have it as low and close to the tank as possible so the amount of time spent generating a vacuum is minimized and thereby reducing chance of a vapor lock. Supposedly angling up the pump by about 30 degrees also reduces chance of vapor lock. I am planning to mount it on a custom L bracket right beside the tank skid plate, and in front of the "pumpkin"....

[viven44]

I must have gone back and forth about 20 times since yesterday evening but I think I'm going to keep the cast iron.

Cast Iron Cons

- Weight

Cast Iron Pros

- Can use splash pan gasket
- Use EGR and be more readily emissions compliant for the future, if the Bronco later moves to a locality with emissions. I intend to retain all the smog pump hardware as well.
- No need to recurve the distributor. Earlier this week was discussion about how design should be such that parts are readily swappable by with off the shelf components. If re-curving was a need, a possible future owner would not know this.

Aluminum Pros

- 65 lb weight reduction

Aluminum Cons

- $400 !! Especially after talking about the double roller timing set and how much extra I get for just under $50, $400 seems like a lot for not a whole lot in return. If I would get the same performance improvement as with a timing set, I would consider it. Would the weight reduction alone provide that ?
- No EGR. The EGR Edelbrock intake is not available anymore. They must have stopped making it. If I were to spend that kind of money I want Edelbrock as I've always used their products and it would pair with my Edelbrock brand new carb I have already bought.
- No splash pan, and the intake cross-overs are to be blocked off. Can be done but it would be a bit cold blooded. Not a deal breaker.