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b18/b20 Combo To Much Compression?

posted by  j fry on  Fri Apr 20 22:24 CST 2012
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last visit: Wed Oct 23 15:34 CST 2013
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Vehicle in question is a 63 volvo l3303 4wd swedish military "tank hunter". PO pulled the b18 and replaced it with a fuel injected b20. Unfortunately he mismatched the b20 block with the original b18 head. PO also installed a weber down draft and header. So, from what i've been told that head/block combination will result in too much compression. True? Whenever I spend a lot of time in low gear 4wd oil spits out the breather cap on the valve cover. Other then that it runs fine. Want to run a compression test but not sure to use b18 or b20 compression standards. Thankyou in advance for any help.






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