I have a 1989 350 5.7 TbI and I have a 96 GMC 1500 with a 305 5.0L Vortec with over 250,000 miles can I use the the heads from the Votec 305 5.0L on the 350 5.7L TBI? If so should I change the cam if so what do you recommend this is gonna be a show/driver what kind of cam and lifters do you suggest and what all do I need to do the heads (valve job, replace lifters, rockers) and what should I do to the block seeing that it only has a few miles since rebuild

15

Asked by Brian N Jan 12, 2018 at 10:35 PM about the 1996 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: Maintenance & Repair

I have a 1989 350 5.7 TbI and I have a 96 GMC 1500 with a 305 5.0L Vortec
with over 250,000 miles can I use the the heads from the Votec 305 5.0L on the
350 5.7L TBI?  If so should I change the cam if so what do you recommend this
is gonna be a show/driver what kind of cam and lifters do you suggest and
what all do I need to do the heads (valve job, replace lifters, rockers) and what
should I do to the block seeing that it only has a few miles since rebuild

3 Answers

127,845

Heads that have 250,000 miles are likely to need valve guides, seals and a valve job. Fine some cheap 350 heads somewhere. Salvage yard or Craigslist would be a couple of choices.

15

Ok thanks for the help. I'm trying to get this done by myself and I'm terminally I'll but I only have money to pay for parts. People from the south like to say there good hearted fine people but, I've had one person step up but, he is full time Army and got transfered he found out I'm a military bratt. Maybe one day one of those TV shows won't require you live in Ca. Or IL. Thanks for the advice I'll propably leave the heads that are on it alone I've just heard so.much about how vortec heads increase hp and I figured if they'd work I'd use them.

1 people found this helpful.
127,845

I think I read that some 350 heads used on a 305 block may have valve to block contact which requires special machining to correct.

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