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B20 block and head choice for performance build 120-130

posted by  vvpete on  Fri Feb 29 04:40 CST 2008
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last visit: Thu Jul 10 14:10 CST 2014
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Use a '75 B20F FI block and a '72 carb head and intake which has the bigger valves and doesn't have the secondary throttle valves in the intake, optimally the best choice, if you can find these. A '71 B20E block is also a good choice, but good luck finding one.
Things to note, the '72-74 B20F has the same bottom end as the 75, but the 75 has an improved forged crank and cam. The early B20F has cam problems as well as connecting rod/wrist pin is weak. I think the '74 B20F has the improved D cam and better bottom end, but has the 6-bolt crank.
Note that all B20E/F blocks have a slightly different bore/stroke geometry (more square, shorter stroke) than the B20B and will be a better hi rev motor with a B20B head and high compression.
--
'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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New B20 block and head choice for performance build [120-130]
posted by  Deluxe  on Fri Feb 29 04:13 CST 2008 >


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