Volvo RWD 120-130 Forum

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b18 spec question 120-130

uid 37336's pic
posted by  B20Paul. on  Sat Nov 21 06:49 CST 2009
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last visit: Mon Oct 20 10:54 CST 2014
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No. 40mm is the B18 inlet, that's why the stems are two different sizes with the 42mm valve having the 5/16" stem. Someone has actually done a bit of work to that head.

B20 valves are 42 & 35mm for early B20A & B20B, 44 & 35 for late B20A & B, 44 & 35 again for B20E with the exhaust having a stellite face. Competition heads from the factory got 45mm inlets & 38mm exhaust. It actually takes a fair bit of work to maximize any head that has 44mm inlets, so bigger isn't automatic unless you are a good porter. Swedes with decades of experience use 46mm inlets, but you really need a 92mm or 93mm bore to get that working properly.



--
Three 164's, Two 144's, One 142 & a partridge in a pear tree.






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New b18 spec question [120-130]
posted by  md122s  on Sat Nov 7 07:16 CST 2009 >


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