Camshaft duration question - Page 2 - Ford Bronco Forum
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post #21 of 26 (permalink) Old 03-13-2017, 10:08 PM
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Originally Posted by RLVBronco View Post
Well it's not really going to be stock anymore... I'm changing the heads, all the valve train, intake, all of the exhaust, and the cam.

The best cam will probably be the operating range of 1,000 - to 5,200. But I want to know if I can use the 2,000 to 6,000 cam with a stock stall converter.
Let's throw something out there with the price of sbf aluminum heads right now you can easily max your speed density and bottom end out with say some good gt40 heads and custom grind cam. Unless you blueprint and forge the bottom end throwing big money at heads and cam is a waste. The cheapest and easiest way to make horsepower has always been to spray it or forced induction. We can all talk this round in circles for days. You can have a fun and budget rig as cheap as parts are now. What re your plans for rig?
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post #22 of 26 (permalink) Old 03-13-2017, 10:22 PM
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Say what?

If they couldn't handle over 5k ford would have out a rev limiter on them to stop them from exceeding that.
They have a built in rev limiter in the intake, heads, exhaust and cats! Go for it Jopes , drive a stock 351 around at 5000 RPM.
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post #23 of 26 (permalink) Old 03-13-2017, 10:33 PM
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Hey I have reved a Vortech SB Chevy to 7500 with a flat tappet cam and it didn't come apart. It did however have ARP bolts, Chevy pink rods and was balanced.
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post #24 of 26 (permalink) Old 03-13-2017, 10:41 PM
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Originally Posted by wyatt earp View Post
They have a built in rev limiter in the intake, heads, exhaust and cats! Go for it Jopes , drive a stock 351 around at 5000 RPM.
I would have no issues wrapping that thing to 6k
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post #25 of 26 (permalink) Old 03-14-2017, 11:08 PM
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To the OP:

Build a motor by matching the power curves and operating ranges of ALL your parts. Don't bolt on random parts just to say you have 'em. A good cam might get you 12 HP on a stock motor. Match it with heads, intake, and exhaust... now that same cam makes 25 HP because it's exploiting its potential.

Don't start by asking what people think of certain parts. Each part is great, if it's coupled with other good parts. Maybe, start by asking yourself, "What do I want to do with this truck, specifically?" Then, "Does this activity require more HP or more TQ?" Followed by, "Where will the engine spends most of its operation? Down low, or, up high in the RPM range?"

Next, decide what ancillary items will, either, benefit, or, hinder your drivetrain. I.E.- gearing, tires, tranny mods, added weight from fabbed bumpers and such. Then, modify your plan, a little, further, based on those aspirations. Build your truck for the end-game. Otherwise, you'll just end up with a garage full of "obsolete" parts that no longer make the kind of power you want.

Third, a million threads on the same subject makes it hard for people to track what your plan is. Especially, when you change it, or, ask the same question multiple times, which implies that you are doubtful about people's suggestions, or, unsatisfied with the responses you, previously, received. If this is the case, join several forums and ask the question to several, different, groups of people. This way, you can compile a list of suggestions and take the most common/acceptable replies as guidance.

As far as your cam, I would suggest an off-idle stick with as low a duration as possible, but, only if you're building the motor for TQ. Just remember, HP is a by-product of TQ. Too much and you're gonna need to tune, so, if you're trying to get away with the stock tune, keep an eye on your parts selection.

My $0.02,
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post #26 of 26 (permalink) Old 03-19-2017, 10:25 AM
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Originally Posted by 445 FE Bronco View Post
Yep start at the bottom and work your way up, pan, pump, baffles, scraper, rotating assembly pre balanced ( scatt ), some heads with 180-190 CC intakes with tulip valves and roller cam.
Yes Now we're talking!! But If I'm going to spend that kind of money on a engine for a Heavy FSB, I'm going to Start with a 460!! LOL!! not a 351w.

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