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hi just pulled down an old 253 red motor
number QR987444 anyone know what year it is from?
also the pistons have no markings on top slight dome top
only the letter F moulded on one side
the bearing shells have 001 stamped on them and also HOLDEN 5RB R500
is this a stendard bore motor or 10thou oversize?
any help appreciated
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Probably early HZ, cast date is in front of passenger side cyl head eg 10F8.
F is for "Front", unless stamped they should be std bore (3.625"). Dome top is to boost compression in later 253s.
James
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THANKS JAMES yes looks like 8H5?
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If its 8H5 (8th August 1975) its from HX but that number is too high. Are you sure its not 8H8?
James
You only have to be in front at the end of the race. |
You only have to be in front at the end of the race. |
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Deas standard HZ 253. Lots of original Holden engines i've pulled apart over the years have had 1 thou undersize bearings ie 001.
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Deas standard HZ 253. Lots of original Holden engines ive pulled apart over the years have had 1 thou undersize bearings ie 001.
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HARD TO TELL a lot of paint on it must be an 8
thanks james
to byron what does the 001 undersize bearing mean?
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0.0001" undersize. Nothing more. Common on standard engines.
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001 on the crank bearing means that it is .001" of an inch smaller in its bore than std, the journal has been linished at some point because of wear, so therefore the bearing needs to be thicker to compensate. Its like the bore and piston but opposite.
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engine number corresponds to a Sept 78 built car |
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were the bearings a copper colour?, most original engines i have pulled down have had the copper coloured bearings from factory.
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Old holdens brought on the spot, quick decision, cash paid. |
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yes the bearings are copper in colour
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hi adam perth
so being copper in colour and with holden stamped on them ,does that mean the undersized bearings were factory fitted?
tony
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1 of my old hotrod books mentions that chevrolet routinely mixed and matched mains
"While we're discussing the crankshaft situation, it might be wise to reveal the fact that the increased demands placed on the crank pulleys of 327 chevys have caused so |
yes sonny, it's an HQ ute |
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1 of my old hotrod books mentions that chevrolet routinely mixed and matched mains
"While were discussing the crankshaft situation, it might be wise to reveal the fact that the increased demands placed on the crank pulleys of 327 chevys have caused som |
yes sonny, it's an HQ ute |
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