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Old 07-04-2004, 07:41   #1 (permalink)
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Building a motor - 302 or 351 block?

Hi Guys,

I apologize in advance for the newb post. Gotta learn somehow.

As a project, I've decided to build an engine. Not sure what it'll go in yet, if anything at all. I expect it to take at least a year or two, and I'm mostly interested in the learning experience. My goal is 350hp NA (FI), and my budget is $4000 over a couple years, which I think is very doable...

So I'm going to start planning from the bottom up. I want more displacement than 302/306. I've read about some people using 302 pistons/351 rods and a 393 crank. Is this a decent combo? 347 would be okay too - what are the advantages/disadvantages to each? (in terms of price, parts availability, performance, reliability)

Also, which block would you recommend starting with? A 351 block or a 302? Which castings are desirable and why??

I know that's a lot of questions. If anyone has links to reading material, that'd be great too. Thx.
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Old 07-04-2004, 15:41   #2 (permalink)
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Re: Building a motor - 302 or 351 block?

Depends what it's going in but the 351 is the one they stroke to those sizes.Besides the 351 block is stronger and better deck height etc..Most 302 efi parts fit except lower inlet, but there are 351 lower inlets from Ford and aftermarket...

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Old 07-04-2004, 16:45   #3 (permalink)
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Re: Building a motor - 302 or 351 block?

Thanks! As to what it'll go in - like I said, not too worried about that. I may buy a Fox to stuff it in, or honestly, I may end up just building it, playing with it for a bit, and selling it. Like I said, more interested in the learning and the act of building than the final product...

I don't mind doing a 302->347 type thing, that's fine. What are some of the advantages to doing a 347 versus just using a 351W with stock (sized) parts?? I realize if I want to go all the way up to 393, then I'll need a 351 block. But I'd be okay with using a stock 351, or a 347, or some other combo. Just not sure which would be the best 'bang for the buck'. Anyone have any general tips or recommendations?
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Old 07-04-2004, 20:00   #4 (permalink)
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Re: Building a motor - 302 or 351 block?

If a 351 fits, dont even think of a 302. A 347 is a band aid fix for cars originally with 302's.

The 351 is much stronger and much easier to make power out of - especially if stroked to 408 plus.

Ps
I absolutley thrashed one of those new fangled XR6 Turbos yesterday, and i mean big time. 347's arent all that bad after all!
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Old 07-05-2004, 14:05   #5 (permalink)
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Re: Building a motor - 302 or 351 block?

Thanks. I'm leaning toward the 351, either stroking it a bit or maybe even just sticking at 351. That's probably enough for me.

Just out of curiosity - are there any glaringly obvious vehicles into which a 351 won't fit?? I'd be looking at jamming it into a Fox .. they go in there fine, right?
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Old 07-05-2004, 20:01   #6 (permalink)
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Re: Building a motor - 302 or 351 block?

Quote:
Originally Posted by DanM
Just out of curiosity - are there any glaringly obvious vehicles into which a 351 won't fit?? I'd be looking at jamming it into a Fox .. they go in there fine, right?
Yes, my car. A 351 wont fit, which is the ONLY reason i went 347 over a stroked 351/408

It also is not always because a 351 wont fit, but because lots of things need changing when converting from 302 to 351. Things like exhausts, sumps, manifolds, distributors...etc..
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Old 07-05-2004, 23:44   #7 (permalink)
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Re: Building a motor - 302 or 351 block?

Can anyone confirm or deny that a 351 will fit under the bonnet of an AU? I have this on-going fantasy of a 408-inch Boss-basher....
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Old 07-12-2004, 05:07   #8 (permalink)
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Re: Building a motor - 302 or 351 block?

Is anyone on the forums running a 351 stroked out to 427??? Now i'd loooove to see one of them under the bonnet of an AU (one of the tickford bodykits maybe?)
that'd have to lay a whoopin on *anything*

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Old 07-12-2004, 08:15   #9 (permalink)
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Re: Building a motor - 302 or 351 block?

With a raised bonnet or BAXR8 bonnet adapted...
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Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...
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