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Old 02-22-2005, 07:51 AM
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Pre/post '87 SBC differences?

Motor newb question here.....I'm hearing that there is some differences (heads?) between the pre/post '87 SBC motors. Is there any other differences besides that? "ive got an '87 305 that I was thinking about rebuilding...maybe with vortec heads (??), cam, headers and bigger TBI & manifold. Would camel hump heads be any good for this motor? I did a search, but the sheer number of threads became overwhelming. Thanks for the patience....

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Old 02-22-2005, 07:58 AM
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GM started phasing in different changes then.

One piece rear mains

center bolt valve covers

Center bolts on intake(around Ex Gas crossover) just slightly different angles

blocks machined for roller cams

mech fuel pump mounting pad not machined

and slightly later changing the timing cover.

Your '87 is probably just like the older motors but the center intake bolts are slightly different. Either set of heads you listed will work but the vortec heads need a special intake.
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Old 02-22-2005, 08:17 AM
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Most Edelbrock manifolds come with a Vortec version, as do many other makers
the Vortec heads are a really good deal
http://www.sdpc2000.com/catalog/3539/Modified-Vortec-Cylinder-Heads.htm

the Fast burn heads are very nice as well
http://www.sdpc2000.com/catalog/3129/products/144/Fast-Burn-SB-Chevrolet-Aluminum-Cylinder-Head.htm
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