Reply With QuoteI have used a 4.0 crank stroked with the mains ground down in a 3.5 block. So it should be possible. 4.0 & 4.6 have bigger mains and big ends. It shouldn't be too hard to make it fit.
Fossicker
SupporterHello,
I have a 3.9 due for a rebuild, but have access to a 4.6 crank, rods, and pistons about 120,000klms old and I plan to re-ring and re shell.
I understand bore sizes are same, but will the crank fit the block. Does the 'big journal' refer to mains or both mains and big ends. Will the block need machining? Or should I machine the crank?
Thanks and appreciate any guidence.
Russell,
1993 LSE.
regards,
Russell.
LSE up, LSE down.....
1976 5.0ltr P76 2 door Rangie
Fossicker
I have used a 4.0 crank stroked with the mains ground down in a 3.5 block. So it should be possible. 4.0 & 4.6 have bigger mains and big ends. It shouldn't be too hard to make it fit.
Fossicker
SupporterThanks Haydofly, So width of mains is same, so no difference for the 4 bolt end caps, just diameter?Originally Posted by haydofly
I have used a 4.0 crank stroked with the mains ground down in a 3.5 block. So it should be possible. 4.0 & 4.6 have bigger mains and big ends. It shouldn't be too hard to make it fit.
Did you have to make any changes to front end of crank?
Russ.
regards,
Russell.
LSE up, LSE down.....
1976 5.0ltr P76 2 door Rangie
Master
I have a 1999 DII V8 4.0 which slipped a cylinder liner last Christmas. Since the block needed to be stripped for the cylinder liners to be top hatted, I figured it made more sense to just install a 4.6 crankshaft.
So now my Disco has a little more grunt!
The answer to your question should be a "yes" although I'm sure there are variations to crankshafts, etc.
These people sell upgrade kits for Rover V8's
http://www.triumphroverspares.com.au/
If anyone knows, they will
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