Re: 390 blueprinting
- I have to agree with Hotrod the engine and age of the engine is a non
factor, they are all similar when you have the proper specs. Heck we
used to "Blueprint" engines when we rebuilt them on the street in the
early seventies!! Any competent engine builder should be able to spec
your engine during a proper rebuild and it should cost no more. Ask
the builder what the difference between a well put together engine
and one that is "Blueprinted". Then ask yourself would you buy a non
blueprinted engine from him? I think the term has several different
meanings, I was thinking "Blueprinting" was extra stuff like
Balancing the rotating assy, Brass freeze plugs, ccing heads and
extra things that enhance a rebuild. Make sure you understand what
they are selling you and good luck.
--- In Cadillac_Performance_Association@yahoogroups.com, "hottrod41"
> I find it odd that any mechanic that works on any kind of engine
> would make that comment about it being "old iron". Blueprinting,
> which is simply checking all the clearances to factory
> is no more difficult on a Caddy 390 than any other engine.Actually,
> most parts ordered fall within these specs but should be checkedto
> while assembling the engine. I have five Caddy 390's in 3 1959
> Caddy's, a 1961, a 1962, and they are no more difficult to rebuild
> than any other motor.
> Rod and main bearings in most all motors have a clearance of .002
> inch, crankshaft journals should be checked for any out of round
> condition with a micrometer, and basically any correct engine
> building process would be called blueprinting. It is inconceivable
> me that any mechanic would simply assemble the parts in an engineand
> not check any clearances, but evidently it is done all the time.Most
> general repair shops these days just seem to see how fast they canof
> slam the jobs in and out.
> I have built a lot of oddball engines for years. One of the rule
> thumb practices regarding having a crank re-machined is if yourinch, .020
> fingernail catches on any bearing journal surface, it should be
> machined to the next oversize bearing, most generally .010
> inch, or .030 inch.News
> If you have some questions, please e-mail me at hottrod41@y...
> I also have a website up at http://geocities.com/hottrodscars
> Also for parts availability, I have subscribed to Hemmings Motor
> for about 30 years. Their online site is http://hemmings.commotors
> In Cadillac_Performance_Association@yahoogroups.com, "rockinrye"
> <rockinrye@y...> wrote:
> > Hey,
> > Can anyone recommend someone in the Northeast to blueprint a 390?
> > I may even be interested in some custom work.
> > Most shops I've asked just shake their head and comment that its
> > some pretty old iron... They are just looking to bang out SBCs.
> > I'm looking for someone that has some experience with these
> > and the right equipment.
> > Much appreciated,
> > Greg
- Ditto... sounds more like they just don't want to bother with
obtaining parts and checking your block & heads, etc. I don't know why
a "performance auto parts" shop wouldn't be willing to do a quality
buildup on this engine.
--- In Cadillac_Performance_Association@yahoogroups.com, "snyiper"
> I have to agree with Hotrod the engine and age of the engine is a non
> factor, they are all similar when you have the proper specs.
- Yes, that was my point exactly; they probably don't
check clearances on anything.
--- GregTalbott <cadillacsgalore@...> wrote:
> Ditto... sounds more like they just don't want to__________________________________
> bother with
> obtaining parts and checking your block & heads,
> etc. I don't know why
> a "performance auto parts" shop wouldn't be willing
> to do a quality
> buildup on this engine.
> Greg Talbott
> --- In
> <snyiper@y...> wrote:
> > I have to agree with Hotrod the engine and age of
> the engine is a non
> > factor, they are all similar when you have the
> proper specs.
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