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Old August 27th, 2009, 06:12 PM   #1
02jeepX
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Default 98 350 vortec HELP

I have a 98 chevy with a 5.7L vortec that went bad. My question is can I use a 94 short block and bolt on my heads, intake, etc, and have all the bolt patterns line up. Can this be done?
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Old August 27th, 2009, 08:36 PM   #2
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Physically, yes it all bolts up. Will it work? No, not without some work. Your 98 has a crank sensor in the timing cover, the 94 does not.
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Old August 27th, 2009, 08:47 PM   #3
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put the timing cover from the vortec on it and the knock senseor boly on your heads and go
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Old August 27th, 2009, 08:56 PM   #4
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Not that easy. The timing set is different; thinner and odds are the timing sets won't swap because the 98 is a roller cam and has a retainer plate behind the cam gear. The plate the crank sensor sees is between the balancer and crank gear behind the cover.

Can it be swapped? Yes, given time and some money. For a quick swap, get the proper engine.
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Old August 28th, 2009, 09:15 AM   #5
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The front of the block where the timing is different.... so the answer is no.
You need to use the front cover from the 98 because it has the provisions for the crank sensor. The front cover from the 98 will NOT bolt up to the 94.
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Old August 29th, 2009, 07:08 AM   #6
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i installed a new engine in a 99 tahoe, the new engine had the old timing cover set up, with the fuel pump boss open like the old style, bolted a block off plate to it, installed the new style timing cover and reluctor wheel off of the old one, worked fine, runs everyday! good luck with yours, not staying it will work for sure, but i've done it. david
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Old August 30th, 2009, 06:19 PM   #7
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did the timing cover off of the 99 bolt up to the older block. what year block did you use?
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Old August 30th, 2009, 06:49 PM   #8
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i didn't check the exact year of the block i used, but it had the old bolt pattern for the timing cover, the new cover blocks the old holes
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Old August 31st, 2009, 07:35 PM   #9
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so did you drill and tap for the new holes on the old block?
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Old August 31st, 2009, 07:40 PM   #10
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Nobody ever bothered to point out that vortec motors have roller lifters as well?

TBI motors rev limit at 4500 or 5000 rpm, I could be wrong but I'm pretty sure vortec motors rev higher.
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Old August 31st, 2009, 07:53 PM   #11
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does the rev limiter really matter? they make plenty of power below 5000, and no the vortec timing cover uses the current holes and bypasses two or 4 of the old ones, yes it has roller lifters but the intake bolts on the same, so an exact swap no, noticeable difference, probably not as long as it has the good heads! david
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Old August 31st, 2009, 08:06 PM   #12
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Quote:
Originally Posted by 1988JeepXj View Post
Nobody ever bothered to point out that vortec motors have roller lifters as well?
See post #4.

From what I understand, the older steel cover will go on the 97+ block, but a few of the holes are not drilled/tapped but the boss's are there. The newer plastic cover would go on the older block and use existing holes, but not use them all.
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Old August 31st, 2009, 08:10 PM   #13
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exactly, thats what he wants to do is use the newer parts on the older motor, right? if so than yeah it should all work
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Old September 1st, 2009, 07:19 PM   #14
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Thanks guys I think I'll give it a try.
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Old September 1st, 2009, 07:24 PM   #15
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your better off just getting another vortec 350, there is a couple on nmi craigslist from parts trucks
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Old September 2nd, 2009, 03:05 PM   #16
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All the ones on craigslist around me I have called and they either need work like mine does or they want a grand or better for.
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