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#1 Posted : Wednesday, 10 November 2004 4:49:15 PM(UTC)
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Can anyone tell me what the difference is between the XA/XB 351C and the XC 351C motors. From data the XB 351C is rated at 194Kw (non GT) where as the XC 351C is rated at only 160Kw.Why is the power output lower for the XC is it different cam, carby? How can i get my XC351C up to 194Kw the same as the XB model?
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#2 Posted : Wednesday, 10 November 2004 6:05:33 PM(UTC)
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Pollution gear and lower compression.
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#3 Posted : Wednesday, 10 November 2004 7:58:12 PM(UTC)
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As brenden says pollution gear (including cam profile)and lower compression.


Also sometime in the 70's they changed the way that horsepower is measured. Earlier they ran the engine without power suckers such as water pump, alternator, air cleane

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#4 Posted : Wednesday, 10 November 2004 8:26:09 PM(UTC)
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And for what it's worth. 21 years ago when I was an apprentice mechanic one of the fellows that I went to TAFE with had a clean original XB 351GT (it was only 8 or 9 years old then). We put it on the chassis dyno & it pulled a massive 140Hp at the bac
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#5 Posted : Wednesday, 10 November 2004 11:03:01 PM(UTC)
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And for what it's worth. 21 years ago when I was an apprentice mechanic one of the fellows that I went to TAFE with had a clean original XB 351GT (it was only 8 or 9 years old then). We put it on the chassis dyno & it pulled a massive 140Hp at the bac
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#6 Posted : Thursday, 11 November 2004 6:44:18 AM(UTC)
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The DIN measure of installed horsepower is used from XC on with 100BHP = 75KW
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#7 Posted : Thursday, 11 November 2004 10:46:43 PM(UTC)
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Thanks guys. Would you recommend the following. Disconnect the EGR, remove those temperature vacuum switches that are screwed into the block, and run the dizzy vacuum advance straight from ported vacuum at the carby.Will this help?
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#8 Posted : Friday, 12 November 2004 6:16:16 AM(UTC)
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Hi Peter. I'd be more inclined to make mods that gave a discernible difference in power such as headers and decent exhaust, aftermarket manifold and carb, camshaft. i know this all costs money but i don't think that the changes that you mentioned would ne
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#9 Posted : Friday, 12 November 2004 6:16:37 AM(UTC)
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Hi Peter. I'd be more inclined to make mods that gave a discernible difference in power such as headers and decent exhaust, aftermarket manifold and carb, camshaft. i know this all costs money but i don't think that the changes that you mentioned would ne
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#10 Posted : Monday, 4 April 2005 6:20:24 AM(UTC)
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1973-76 xb V8 351 2 engine had 186 kilowatts wit compression ratio of 9.1,xb GT 351 4V egine had 224kilowatts with a compression ratio of 9.1 this was the australian version.the imported 351 xb GT 4V enginehad 224kilowatts and a compression ratio of 11.0.
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