Bolt on HP from a roller 351w with heads and a cam

[Seabass]

Hey guys, I'm looking to slap some heads and a cam on my 96 bronco trying to wake it up. I've spent some time on the ford forums but it's just not the same as pirate tech. Most of the guys there are building straight line motors and I'm assuming it doesn't carry over to well to a motor pushing a 5k barge around.

I can't find what the factory piston dish is. Well I can but every time I find and article on it it's different than the last one. Any one on here know difinitively what the dish size is on a 96 roller motor out of a bronco.

I'm thinking I want a head with a 58cc or smaller pocket to get as much compression as possible with the cavernous stock pistons.

I'm not looking to reinvent the wheel here, I'm sure there's plenty of folks that have done the same thing. I just haven't ran into one yet. Any proven combos out there for a go fast bronco?

[benjaminshaw80]

Fullsizebronco.com..........

[Seabass]

I'm on there. Pirate can beat up FSB any day out of the week.

[Tdmayfieldiv]

What is your plan for fuel delivery? Speed density will shit a brick if you just slap some heads on it.

[blown95svt]

Originally Posted by Tdmayfieldiv

What is your plan for fuel delivery? Speed density will shit a brick if you just slap some heads on it.

96 bronco are mass air

[Seabass]

Yup. Factory mass air.

I've got an edelbrock truck manifold and a bassani y-pipe.
JBA shorties are on the list to be ordered.

I'm on the hunt for some twisted wedge 170's or 190's with 54cc chambers and knocking them down a few cc's to give me some more pop. But with out knowing the factory dish size I don't know how far that'll take me. I'd like to be around 10.5:1 (or at least thats what I think I want. I'm open to suggestions)

[kemicalburns]

you will still need a tune to get max hp/trq unless "good enough" is acceptable. 54cc's are already pretty small so why reduce them further, and you would have to run premium fuel all the time.

need more info on your rig specs also, are you running larger tires, gears? lift? reason i ask is if you have large tires and not geared properly a motor build wont give you the nuts you need to move them any better.
Fullsizebronco.com is a great resource for a bronco motor build as there are many on there from standard builds to strokers etc..

[Tdmayfieldiv]

Originally Posted by blown95svt

96 bronco are mass air

well excuse me

[blown95svt]

Originally Posted by Tdmayfieldiv

well excuse me

I had to hunt for mine, roller cam and mass air! Now just gotta collect parts.

[Seabass]

The plan is to run 4.88's on 35" tires. What other specs you need?

I don't mind running 91 octane if that means I'm getting the most I can out of the displacement I have.

My concern is running higher compression and keeping the power band low/mid range. I've heard it's running a stump puller cam and high CR can cause det issues. I'm hoping running slightly overgeared will help or allow me to run a cam with more overlap with a higher powerband.

[Seabass]

Playing with compression calculators I think a 56cc chamber will give me 9.4:1 compression. Not as fire breathing as I'd like but should be substantially better than the asthmatic factory 8.6:1

Any one in the know got any Idea what I can get out of running 9.4:1 and 351 cubes with a no compromise cam?

[RanchTruck]

Compression ratio doesn't matter that much if you're only jumping up a point or so. Switching to better flowing heads and a lighting/gt40 or aftemarket manifold will make a much bigger difference than the compression ratio will.

Here's the stock roller cam specs if you didn't have them:
F4TE roller cam, '94+ truck and Explorer

256/266 adv duration
0.422/0.448" lift with 1.6 rockers.
203/216 dur at 0.050"
106 ICL 126 ECL

Valve timing seat to seat
IVO 22 IVC 54
EVO 79 EVC 7

Valve timing 0.050"
IVO -4.5 IVC 27.5
EVO 42 EVC -6

[Seabass]

I was planning on buying a little more of an aggressive cam. Hoping that overgearing, running a little higher CR and the converter will wash out the lose on the low end.

[Whitetrash303]

If you want stupid power out of a 351 bigger heads are a must. Gt40 heads stop flowing more after .510 lift, so anything much bigger is a waste. I've had good luck with the Trick Flow TFS1 myself.

From an earlier thread:

Originally Posted by Whitetrash303

Had this laying around from playing with ideas for my Foxbody. This shows what a torque monster it will be, but that it also runs out of breath quick.





357 CI. (351 .030 over). GT40P heads, Lightning Intake, TFS1 roller cam, and long tube headers. Just a simulation, not an actual dyno run.




Attachment 627451

Edit: not sure why the attachment failed, but you can click on it.