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B20 block and head choice for performance build 120-130

posted by  vvpete on  Fri Feb 29 07:49 CST 2008
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last visit: Thu Jul 10 14:10 CST 2014
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No. Not all B20 heads are the same, and if performance and high compression along with the larger valves are important to you, the only one's to work with are the early B20E heads and the one and ONLY US carb head that had the bigger, same size valves used on all the E/F heads as well as 10:1 compression is the '72 (up to '75 in Canada and Europe) B20B head. This head was only used on US wagon models and came with the HIF6 carbs, as all other models came with FI as standard, and the wagon was opt FI.
If you take any of the later B20F heads w/larger valves, you would need to block off the injector ports and shave the head to up the compression, and do some porting to open up the flow. Just using a thinner head gasket is not enough to get it to 10:1 or greater.
--
'89 245 sportwagon, destroyed by hit & run driver, RIP. '04 V70 2.5 T Sportwagon, 12k mi and '91 245 5-speed, 209k mi, replaced the '89






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