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I’m looking around Craig’s list for a B-20 engine to rebuild and stick in my PV544. As far as the cyl. heads go, which stock head has the largest valves? While I will be using carbs, and a header, I wonder if any one here knows the difference between the B-20 a, b, e, and f cylinder heads and or blocks? I only played with B-18’s back in the day. I’m not going for an all out race engine, though the 2.3 and 2.5 stroker cranks look cool.
 

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Re: Best B-20 engine (Francis 58)

All B20 heads have 35mm exhaust valves, same as B18s but with narrower stems. On the E/F injection heads, they're stellite.<p>B (carb heads) have 40mm intake valves, and 9 to 9.5:1 compression. Chamber diameter is 90mm, all the others are 92mm.<p>E heads have 42mm intakes and 10.5:1 compression. In stock form, these have the best-flowing exhaust ports.<p>F heads have 42mm intakes and 8.7:1 compression. While the exhaust flow isn't quite up to the E stock, this casting allows porting that flows better than you can get from the E.<p>There is a later, non-U.S. market carb head which is the same casting as the F and uses the same valves, but the intake ports are slightly smaller (not necessarily a bad thing).<p>I'm not familiar with the B20A, and don't think it was ever sold in the U.S.<p>
 

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Re: Best B-20 engine (Phil Singher)

Thanks, exactly what I was looking for... <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 

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Re: Best B-20 engine (Francis 58)

<A HREF="http://forums.swedespeed.com/zerothread?id=109980" TARGET="_blank">http://forums.swedespeed.com/zerothread?id=109980</A><p><A HREF="http://eugene.craigslist.org/boa/1007281406.html" TARGET="_blank">http://eugene.craigslist.org/boa/1007281406.html</A><p><A HREF="http://sfbay.craigslist.org/sby/pts/1007294413.html" TARGET="_blank">http://sfbay.craigslist.org/sb....html</A><p><A HREF="http://forums.swedespeed.com/zeromodify?cmd=editpost&id=1162176" TARGET="_blank">http://forums.swedespeed.com/z...62176</A><p><A HREF="http://portland.craigslist.org/clk/pts/1001222565.html" TARGET="_blank">http://portland.craigslist.org....html</A><p><br>George Dill
 
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