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#1
07-25-2007, 02:38 PM
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Block question?
Can anyone tell me the difference between 67 400 blocks. Is the machining different say for a WT, XM, YS block? Besides the code stamps, what is different. Thanks
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#2
07-25-2007, 06:00 PM
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the wt was a base 335 hp for a 4speed car,the xm was the 255 hp for a auto matic 2barrel econocmy car,ys was the base 335 for a auto car
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#3
07-25-2007, 06:49 PM
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From what I've seen with Pontiac engines, the only difference in blocks of the same casting number was the stamp itself and the engine internals--cam & pistons in some cases.
__________________
BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
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#4
07-26-2007, 11:31 PM
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yep, no difference at all. Same as the rearend housings that have seperate codes but are the same except for the internals. The block could have ended up anywhere until the guy with the hammer and letter punches showed up.
__________________
Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#5
07-27-2007, 07:38 AM
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It's amazing how two little stamped letters change the impression and value of a piece of cast iron!!
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