Is this engine build even close to realistic?

jabb · Feb 18, 2008

Hi everybody, I'm in the conceptualizing stages of an engine swap/build for my recently acquired 67 stang. I want to build up a blown 5.0 using Ford Racing's "new" Boss 302 block.

My goals for this build are as follows:
I want to make as much power as possible (a given right?) 500+ would be great, 450 could do
I want the car to be streetable and FUN (lots of bottom end) BUT...
I'd like it to pull all the way up to 7000, or 7500, or even 8000 rpm
and I want to keep the HP and torque curves relatively flat over the "normal driving" rpm range (2500-6000 or so)
and I'd like to do this using midgrade gasoline or eve (gasp) 87 octane

Not askin for much eh? lol

Now I'm no engine builder and am a relative newbie to auto performance, so crush my dreams and tell me what of that is attainable and what isnt. I won't say cost is of no concern, but if I can build it a part at a time, I've no issues with droping $12 grand to $15 grand or even a little more over the course of a few years.

Thanks for the input

mavmavv · Feb 19, 2008

Use the search tool my friend, you will find 450 horses out of a 5.0 isnt too hard to do with forced induction.

jabb · Feb 19, 2008

I know 450 horses isn't tough, nor is some combination of 2 or 3 of the things I mentioned. Its the whole package I described that I'm wondering about. For instance I have no idea what would be needed to have lots of low end torque AND pull all the way up past 7k. Thats why I'm asking if the combination I want is even realistic.

leroy93lx · Feb 19, 2008

My question is why it needs to rev to such a high rpm? Just curious.

Prime Lord · Feb 19, 2008

You'd have to have some really tight tolerances to get productive power above 7000rpm. 90% of the 5.0's out there would just be floating the valves that high. It might be possible, but I don't know that its worth the headache.

2000xp8 · Feb 19, 2008

You'll have to go with a solid lifter and cam setup, probably some jesel rockers to get that type of rpm. Not always the best for a street car, although i've seen it done.

With the new boss block, power numbers will be pretty much limitless for a street car. All depends on the parts you use.

Wallzy · Feb 19, 2008

In a push rod motor motor without looking at the data on a spintron you are running the potential of wiping your cam out or hurting your valves.

Walz

302RollinHard · Feb 19, 2008

If you get a *gasp* custom cam from one of the many guys out there (Jay Allen of camshaft innovations, ed from flowtech induction, etc etc) You can do pretty well at meeting your goals. As said before, it will probably have to be a solid roller setup with properly matched springs/lifters and good flowing set of heads. If you are gonna be spinning it that fast I think that an investment in shaft mounted roller rockers (probe makes good ones bang for the buck) is warranted.

jabb · Feb 19, 2008

The engine doesn't HAVE to rev that high, but as I've decided to go with a modern interpretation of the Boss 302 for the powerplant I wanted something that'd live up to the legend, not just a better-than-average 302 with boss valve covers Besides, having usable power low and high will allow for an enjoyable drive regardless of whether I'm feeling mild or wild

mavmavv · Feb 19, 2008

What everyone is basically telling you is, Yes. It can be done. It will cost you a pretty penny to do though, especially with a SBF.

Get a good book and read up on the basics of engine performance (or even just use the net), you will have a much better understanding and idea of where you want to take your engine build.

2000xp8 · Feb 19, 2008

You also sound like you are planning on actually using it as a 302, i would'n't bother doing that.
Not sure what the boss can be stroked to, but at least make it a 347.

goodfastncheap · Feb 19, 2008

Boss 302 block/midgrade gasoline/8,000 RPM? Not knockin ya bra, but what do you REALLY want from your motor?

jabb · Feb 20, 2008

Lol, no offense taken man. Thats why I'm asking whats realistic. Thats how design should go: think big, find a compromise thats realistic and that you can live with, build it, tear it apart, change it, and build it again!

91notch5.0 · Feb 20, 2008

you can get up to 360 cubes out of the boss block.

goodfastncheap · Feb 20, 2008

If your max budget is 15 including the blower, I don't think you'll have enough to get all the trick valvetrain parts and QUALITY forged internals to turn 8,000RPM (for long). Don't even think about running less than 91 octane in a nice performance motor, ever.

You say 450 hp with a flat curve -- you can do that carb to pan for a LOT less than 15k, no forced induction necessary with a 408.

TokyoJoe · Feb 20, 2008

Yep, a nice bottom of the line (cast crank budget) 408 shortblock will make 450+ to the tires depending on how much you spend on the top end.

U don't need a BOSS block to make only 500rwhp

And as said above, it's an expensive performance engine, protect your investment and feed it premium.

Is this engine build even close to realistic?

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