350 blocks

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Feb 9, 2010 | 09:41 PM

Fullofquestions

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350 blocks

Whats the difference between a 1985 350 block and a 1991 350 block. The only thing that I know of is the rear main seal. Do the same heads fit both?

Feb 9, 2010 | 10:18 PM

89fireeagle

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Joined: Aug 2009

Posts: 26

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From: spring valley

Car: 89 firebird 83 t/a

Engine: 305 tbi

Re: 350 blocks

im pretty sure they should. look at the bolt patternt they will tell u

Feb 10, 2010 | 11:33 AM

1ADan

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From: Pepperell, MA

Car: 1987 Trans Am

Engine: LQ9/L92

Transmission: 4L60E

Re: 350 blocks

they will both use the same heads without issue. depending on where the block came from, the newer one may have provisions for hydraulic roller lifters as well

Feb 10, 2010 | 01:03 PM

Apeiron

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Joined: Jan 2000

Posts: 20,981

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: 350 blocks

Any SBC heads will bolt to any SBC block. The crankshaft flange and oil pan are the major differences.

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