talked to an engine builder to see what direction i'm going with when the 302 goes in my 69 or just going fresh for an upgrade and reliability...he mentioned just rebuilding mine as a 347....I guess its the crank and other internals....of 351w mixed with 302 stuff to make a 347....supposed to have power and torque of 351..but fit under hood like original. Does anyone run this set up that could explain more and are you happy with it.....THX...

Here's a pretty decent article covering stroking a 302. http://www.fordmuscle.com/archives/2002/04/331/

I think most people just wind up stepping up to a 351W rather than throwing money at a 302, which will reach maximum capacity for power sooner than a 351W.

If you are planning to keep it carbed, I think you might be able to make everything fit under the hood using low profile intake stuff. I could be wrong on that though. You will definitely have fitment issues if you go EFI though.

He said it was'nt stroking...cylinders are left the same...its with the crank and other internals

a 347 is a stroked 302. There is a great article that explains why a 351 is a better motor than a 347. Ill find it and post it later today. I wouldn't sink the money into a 302.


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Thx..sweet artical..i'm learning...i just like the thought of not chopping my hood and i like the stock look..so much involved to fuel inject or go 351...what do you think of carberated 351 cleveland...not quit the work and sweet upgrade?? plz inform thx..

pilosopher would be the man with the plan when it comes to running a 351C. He certainly seems happy enough with it in his Bronco. Hopefully he can chime in on cost and ease of installation.

351w x15,000. Much stronger block, and probably cheaper to buy and rebuild a 351w than to custom build a 302. Heck, you could stroke the 351 and have a very reliable, very powerful 393. The clearance issues with the 351 block aren't that significant, as the overall height is only increased by an inch or two. A body lift or a hood bubble will take care of it.

Here is the article comparing 347 vs 351W or a stroked 351W. 351 is just a better starting point than the 302.

http://www.badasscars.com/index.cfm/pag ... prd104.htm

BCB says that their adapter with the truck/Mustang intakes will fit under a stock hood. Also, T-bird & 94/95? Mustang uppers are even shorter than the regular Mustang intakes.

http://www.bcbroncos.com/store/product_ ... ts_id=1059

351 Clevelands mostly used the big block bell housing bolt pattern so you'll need a transmission or bellhousing to match. There are small block bellhousing 351C, but they aren't easy to find, and probably expensive. I don't know if they are any easier to fit under the hood than a 351W. And there aren't factory EFI options. Cleveland stuff is known as go fast stuff for muscle cars, I'm sure they can be built for truck needs, might be more expensive than a 351W.

A carb'd 351W would be less work than a 351C. I don't know if 351Cs share motor mounts w/the 302, so you might be building new motor mounts/towers too. A 351W will bolt right onto your stock motor mounts/towers & to your stock transmission.

Stroking a motor involves changing the crank, connecting rods, and/or pistons to increase the stroke of the piston=more cubic inches. Boring a block will increase the piston diameter=more cubic inches. When your mechanic said a 347 involved crank & pistons, etc, he was describing a stroker motor. You can't bore most motors to get much more cubic inches, maybe 4-6 extra cubic inches. But you can increase the stroke of 302s to 347, and 351s up to 427.

thx for that great info....doing my homework and learning...also on BC and saw that coyote motor in the EB...WOW..learned about 5.8 EFI Lightning motor...looks sweet also...go big or go home...if i'm going to do this want to be happy and be worth it..BC broke it down about the old speed density and the new MAF and gt40 intake...learning alot....thx

what about the 351m/400 motor....

I had a 79 Bronco w/ a 400, that I took the axles from. I seriously thought about keeping the motor. They can easily produce tons of torque at very low rpm. The 400 can be stroked to 434. But, the motor is really too big to fit in the engine compartment, it uses the big block bellhousing- so a new trans or bellhousing, no factory EFI. In fact there is very limited aftermarket support for the motor. There are a couple 400s in early Broncos over on classicbroncos.com.

I ended up scraping the motor with the shell of the truck.

Saw this one a little late, but the only thing a stroker is good for is in a Mustang where weight is an issue. I'd much rather have a 351 than a stroked 302.

To add to Gunni's comments on the 351M/400...

It's friggin big. Yes, the displacement might be the same as a 351W, but it is a different block design and they ain't light. You'd have to fabricate mounting options for it. The 351M/400 also has a known oiling issue that you could have a knowledgeable Ford guy make a fix for. Some 351M/400 blocks came cast with dual bell housing patterns in them enabling you to bolt up "small block" Ford transmissions to them (C4, AODs, etc.) however they are RARE and most people who know anything about them will ask a pretty penny for them.

Now, all of that being said, 351M/400 motors are stupid cheap to buy. Very few people want them and most are being melted down and turned into soup cans and the like. I would personally like to build a 434 stroker for a separate project. But putting one in to a Bronco is not something I think I would do, unless the price was right and I was faced with few other options.

Ultimately it is your truck and you should do what makes you happy with it. If you want something a little less common, go for it. If you are looking for ease of installation and maximum enjoyment afterwards, well that might be a different route.

So I'm figuring an EFI 351w is the way to go...does anyone have a picture of that set up in their Bronco...and do you like it...thx for the help...great info...was going to upgrade stock 3 on tree with np435, but after purchasing 1974 Toyota fj40 with sb 283 chevy and turbo350 trans with power steering upgrade...power steering going in bronco and lovin' that auto trans...thinkin selling np435 and going auto...c4, c6, aod...was on advance adapter and BC Bronco,also like that fz 5 speed set up...any thoughts on my tranny issue...auto more money and work, but is it worth it....maybe just stick with np435...no like I go over 60mph anyway....thx

You have 2 choices to make, auto or manual, overdrive or not. If you go with an overdrive trans manual or auto, plan on regearing your axles. You'll want 4.56-5.13 gears. You want your rpms in the motor's "power band" while cruising at 65mph.

If you stay with a manual, the NP435 is great, I've run one for 10+ years, super low 1st gear, and bolts to a D20 with just an adapter. Driveshaft lengths do not change & you reuse your stock tcase support crossmember. Bullet proof & cheap if it does break. Make sure its a 28 spline output shaft, to match the D20.

ZF seems to be the 5 speed of choice. Nice low 1st gear, with 5th gear overdrive. Need adapter & output shaft (=tear trans down & rebuild w/new shaft) to use with D20, but will bolt directly to Atlas t-case. Driveshaft lengths will change from stock. also needs custom/aftermarket support crossmember. Hydraulic clutch will need installed instead of old manual clutch linkage. You have to find a trans from a 4x4 with the small bellhousing (it comes in 2x4 and big blocks/deisel bellhousings too- you can't/don't want to try to use them).

I'll let someone else explain the automatic choices.

Here is a good gear calculator, you can figure your rpms & crawl ratios by entering your prospective choices:
http://www.novak-adapt.com/knowledge/gearing.htm

Here is lots of info on all trans choices on CB.com:
http://classicbroncos.com/tech/early-br ... al-options

Thx again for great info...learned 69-74 351w was the strongest ....and 96 Bronco,,last year had a roller motor...with that BC Bronco plate and mustang or explorer fuel injection. explorer having gt 40 intake...oh boy...learned heads on 351m/400 are same as cleveland heads and on windsor makes clevor...same power potential as cleveland.. with ruggedness and parts availability of windsor..oh boy...might be on to something...checked out MSD Atomic FI...and Very Cool Parts...Projection...alitttle over 2g for those or head to pull and pay and find my parts...let the hunt begin...getting excited...using the np435 should keep things strong..functional... and cost effective to pull off this motor thing...think I'm getting a plan....make my rippin 302...which is a hybrid with 351 intake and 351 heads... last as long as I can till I aquire parts for this upgrade...My Pops said my motor will probably last longer than I think...don't fix if it ain't broke...fixing more priority stuff first to gain reliability in hopes of being on trail one day....just educating myself..making plan...and saving $$$...one day I'll be proud...hopefully sooner than later...till then its a totally driveable project I love putting around town in for now....thx..

I don't think I have any pics of mine, but I love my 351 EFI. It came from a '94 F-250, but I have a fiberglass hood to clear everything. My first bronco was carbed. Never again. Go with EFI. It's a headache up front, but you'll be so much more happy, especially on that cold morning you walk out to your bronco, prime the fuel and it fires in less than a second. Or when you're climbing a hill offroad and it keep running. Chances of vapor lock are much lower too.