> From my view, I think it's more the fangle factor associated with their rarity
> that brings the premium.
That's typical for out-of-production hot rod items.
> XE blocks didn t come in passenger cars (at least none were designated for
> such) so there's no premium that could be assigned to making a collector car
> original, with the possible exception of a vintage race car.
You're correct. The only XE blocks that were put in to production cars
were rejects. There were quite a few of the second batch of XE race blocks
that didn't meet minimum specs with respect to core shift and other defects.
Some of these blocks were subsequently transferred to the standard machining
production line and were sometimes fitted with two bolt main bearing caps
(depending on when they were discovered to be defective) for use in a standard
passenger car or truck engine.
> So...I'd view it as a block to build a street performance or race engine and
> would compare it to all else available for same.
I've been thinking about using mine as the foudation of a back up motor to my
Fontana but it's kind of hard to pull apart a freshly assembled short block
with Ford XH1 forged steel crank, Carrillo rods, custom forged pistons,
dry sump, etc. If I do build it as a back up, I'll probably sell off all
those parts. I don't plan on turning the RPM to need that stuff.
> Other than this, it seems one could assign some value to the XE block for not
> having to change accessory brackets if you had a Cleve equipped car, ability
> to use a Cleveland intake if you already have one that has been well worked
> and/or matched to your heads, and or maintaining the appearance of a
> Cleveland block in a car that is supposed to have a Cleveland.
And also not having to buy another $450 road race oil pan or having to
change the coolant lines, etc.
> I've been told by several people I know that actually have built engines with
> these blocks, that they are no better (or worse) than an ordinary Cleveland
> block in regard to wall thickness/core shift.
Was that Dennis at PPC? I was told by Kip (formerly of PPC) just the opposite.
He said the XE's that passed through the shop didn't have any core shift
problems and he's bored them for sleeves and never broken through, unlike
standard blocks. He also mentioned sonic testing a bunch of Aussie 2 bolt
main blocks only to discover they were no better than standard U.S. blocks.
> This being the said, I would think the same cautions apply to the thrust
> sidewall thickness when building performance Clevelands.
Agreed. Even though the core-shifted blocks were culled from the race program,
they still have made their way onto the used market. Buyer beware.
> How are we ever going to set the record straight on how thick the walls are
> and how thick the pan rails are and how thick the bulk heads are? Common dig
> it out and lets put some hours on it.
I've currently got an XE, a U.S. 2 bolt main, and a U.S. 4 bolt main block
in the garage. When the weather warms up a bit, I plan to do just that.
> The main bulkheads aren't any thicker. The pan rail is just solid as if
> simulating a girdle. The walls are .170". Production blocks are .160"
Where are you getting the wall info from?
> Personally screw in plugs, a main girdle and an Aussie production block is
> probably better. Those blocks will hold 1000hp.
Not for any length of time. On my scale, the production Aussie blocks don't
weigh anymore than a standard U.S. block and they don't sonic test any
different. XE blocks are a different story.
> NASCAR teams considred the crank good for one 500 mile race.
Yup. NASCAR engine builder Mario Rossi said they would pitch the iron cranks
after a single 500 mile race but the billet cranks could last 6 races. Said
similar things about the XE block.
> Any yes a friend told me his engine builder told him to take his XE some
> place else after boring one of these blocks due to the alloy content.
It might be worthwhile to brinnel test my XE and a production 351C block to
see if there's any difference. Even standard 5.0L blocks are harder to
bore than the typical 350 SBC block.
> Except for the oil pan rail XE's thicker where you can't see it. Caps are
> the same.
The caps on both my XE blocks were beefier than the standard 4V caps.
If your XE has standard caps, I wonder if it was one of the rejects fitted
with production caps?
> I'd still run it with a girdle and screw in plugs.
The Boss 302 screw-in plugs are available but you need a big honking tap.
Not exactly a girdle but my first XE block had main cap straps installed,
supposedly by Roush:
http://www.bacomatic.org/gallery/dan-ausclv/Aus_Clev_4A lot of builders don't like girdles. If I did a girdle it would have to
be done with a material with the same theremal expansion as the block and
caps. A friend ran a girdle on his 5.0L block and it walked the caps anyway.
> I heard the posiblitiy that some are siemeze?
None that I've personally inspected were Siamese, though I know of an SK
iron block that was.
> The pillows?
The so-called pillow blocks were from the second casting, manufactured
during 1982 and 1983. The fist batch was cast in the 1975 time frame.
Dan Jones