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Old 11-02-06, 05:08AM   #1
g-man65
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Default opinions on some parts

i have a chance to pick up some pontiac stuff thats actually within driving distance.....is this block/heads decent for a nice street build a couple years away.....supposedly a 1970 xf code block(455), right?.....a crank(which i hope is from the same block)....a pair of 4x-3 heads?....(how do i tell if the crank is for the 455, or does it matter?).....a low mile rebuilt turbo 400...complete brackets & pulleys....misc. '69 chrome trim....spread bore factory intake...& more odds & ends....all for $225,....& a six hour round trip.....can't go wrong?...or?.....i kinda have been hoping to find a 400 block, but not a lot of action in my neck of the woods, should i just snatch up this 455 for now?....g.
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Old 11-02-06, 02:33PM   #2
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455s are getting scarce. If you feel lucky enough or can trust the owner that nothing is major wrong with the block, snatch it up.
Crank should be large journal and I believe the center throws will be squared off if its a 455 crank.
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Old 11-02-06, 02:40PM   #3
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Even if the block is nfg, the tranny & misc alone would be worth the trip...
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Old 11-02-06, 04:36PM   #4
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Go fot it!
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Old 11-03-06, 03:44AM   #5
g-man65
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well....got some more info....maybe not as good as i hoped.....waiting for some casting #'s......but the gentleman has told me its definately a 400 block, but newer-'76-'79?...with the firebird style motor mounts?...have to adapt for my ride....plus, newer is weaker, yes?....i may pass....still mulling it over.....theres a few xf codes used over the years ....so need to positively i.d. it....heads are average, & i really don't need the tranny....decisions
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Old 11-03-06, 11:54AM   #6
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Well, in my neck of the woods, old Pontiacs are getting hard to find in the yards with motors in them. Hardly ever see a "beater" come up for sale cheap. The scrap steel prices are so dang high right now that everything is going over the scales. Personnally, I would still consider the 400 block. Think about how many 455s were made and now how hard to find. The same thing is happening with 400s. 350s are starting to bring in more money because the bigger cubes are drying up. If the block is good, wouldn't hurt to rat hole it for a later need. As for weaker, how much power are you looking to realistically make? Sure I dream of 600HP but on my 4 kids family budget, I'm no where near affording that much HP so I can look at "weaker" blocks knowing I won't be stressing them. And you could always unload the tranny and it would be like getting the block for free.
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Old 11-03-06, 04:39PM   #7
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good points to consider......i too dream of horsepower i can't afford, & probably could never use on the street anyway !!.....i'm 100 miles from a major city, so i worry about the ability to sell off the tranny, & storage space is tight....hmmm....i've got a '73 350P motor in my car now, probably with 200 hp....so to get to say 300+ would be enough.....whats the formula to compare the change in hp ratings from the older motors, to when they changed to net hp, like the 175 that my '73 is rated??
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Old 01-13-07, 07:54PM   #8
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Default XF code

The blocks will have the displacment cast on the block near the motor mount.
PS whre in Washinton are you?
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Old 01-18-07, 07:10AM   #9
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If it is a later 400 block then be careful how you build it........those blocks are weaker than the earlier ones and wont handle as much HP.
Still worth the money though if its a good rebuildable block.
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