Small-Bore Pontiac Engine Build - Revenge Of The 350
Any '68-'77 350 block that passes the usual magnaflux and pressure test inspection is plenty strong enough for the job. Ken Brewer says that only blocks cast between 1970 and 1975 feature the desirable five-boss motor mount layout, as shown. You can plug these blocks into any '61-'79 Pontiac using the stock mounts that came with the car. Earlier '68-'69 blocks have only two bosses, while later '76-'77 Firebird-specific blocks have three bosses. These details may cause motor mount hassles with certain vehicle installations, but adapter mount kits are available from Indian Adventures and others to solve such problems.
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