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Old 01-22-2008, 02:28 AM   #1
cfinance
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Thumbs up Engine Blueprinting

I've torn apart my 350 in prep for a mild performance rebuild: >= 350 hp/ci, budget of $2500-$3000. What is the difference in the build tolerances between a "blueprinted" engine and a good, careful rebuild? Where would I get the needed tolerances for a blueprinted build? Is it worth the hassle and extra hours?

The truck is a mid-life project, not a daily driver. The main reason for the build is for the experience...and to show it off at the occasional stop light and burger joint.

I'm an apprentice machinist and know enough to get in trouble. Please help me get in trouble
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Old 01-22-2008, 05:41 AM   #2
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Re: Engine Blueprinting

This is my take on the subject and they way I've had it explained to me. You don't hear the term blueprinted very much anymore and even though it is in referance to exact factory specs, by today's standards a good rebuild is pretty much blueprinted. If you deck and square your block, line bore and torque plate hone it, measure all your clearances, resize your rod ends, cc your heads etc. making sure all is equal cylinder to cylinder, you've pretty much blueprinted your engine.

Like I've said this is my take of the word and some may take it more towards the ORIGINAL factory specs and measurements. As far as clearences go, that would depend alot on the intended use of the engine, and parts used.
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Old 01-22-2008, 02:56 PM   #3
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Re: Engine Blueprinting

The original factory specs(blue prints) aren't close enuff for a race engine. That being said, it is worth the time to check every measure ment and to correct any that are out.

Those carefully assembled engines always seem to run a little smoother and faster
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Old 01-27-2008, 04:55 PM   #4
cfinance
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Re: Engine Blueprinting

Thanks. Anyone know any good websites or links that provide a comprehensive checklist of machining applications with specs for a mild street race application?

Thanks again.

(Also, if this should be posted in Engine Drivetrain, sorry. Please let me know).
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Old 01-31-2008, 04:38 AM   #5
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Re: Engine Blueprinting

I've got a book on blueprinting, I can scan in the spec worksheets if you want.
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Old 01-31-2008, 05:50 AM   #6
Billla
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Re: Engine Blueprinting

The sole purpose of blueprinting is to allow easy replacement of assemblies - i.e. in a race engine ensuring that every single piston is exactly to spec, every rod and the combination. Where a race engine burns a piston, it makes it possible to replace that single rotating assembly without introducing variances in engine performance.

For example, I recently bought a set of SCAT I-beam rods. The lengths varied from 5.699 to 5.701...would you really want to resize the big ends of these rods to make them perfect? Thinks like indexing the crank stroke, etc...it's a lot of time and a lot of money.

IMHO this is expensive and useless for anything other than a purpose-built race only engine. Build to within spec and invest in a good balance - that's all that's needed.
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