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will 97 4.3 heads and intake go on older block?

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Old 08-28-2011, 11:03 PM   #1
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will 97 4.3 heads and intake go on older block?

i have a 97 blazer with a bad engine, thrown rod, i have found a 4.3 out of a s10 it is tbi, probly 90 or 91 but not sure. can i swap my heads and intake onto the older block? is there any machine work needed? also i havent got the motor out to look at it i might just rebuild anybody know a good cheap place to order a rebuild kit? thanks
Old 08-29-2011, 03:04 AM   #2
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Re: will 97 4.3 heads and intake go on older block?

the heads themselves will swap to the older model, and since you're swapping the short block out basically and keeping your original heads, you can keep your intake as well.. however.. if it's a balance shaft and your truck was a non balanced shaft, then that could be a problem, I can't keep with with which and what yrs are balanced and what years aren't balanced, so I can't be much help there, but the heads will swap.


On a side note.. search is your friend that swap has been done many many many a times fyi.
Old 08-29-2011, 10:48 AM   #3
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Re: will 97 4.3 heads and intake go on older block?

thanks man i'll find out about that ballance shaft
Old 08-29-2011, 10:52 AM   #4
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Re: will 97 4.3 heads and intake go on older block?

how do you tell witch one has the ballance shaft? anybody know what years had the ballance shaft does the 97?
Old 08-29-2011, 11:15 AM   #5
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Re: will 97 4.3 heads and intake go on older block?

1992+ 4.3's got the balance shaft blocks...

Old 08-29-2011, 02:03 PM   #6
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Re: will 97 4.3 heads and intake go on older block?

yep 1992 up have balance shaft, my 91 doesnt and you can tell by the way it idles, feels more like an old v-8 at idle definitely different than a 92 up that were smooth quiet etc.


the heads will physically bolt up yes
Old 08-29-2011, 11:53 PM   #7
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Re: will 97 4.3 heads and intake go on older block?

Actually only blazers in 92 got them and even then GM put out 4.3Ls all the way to 95 without balance shafts.
Old 08-30-2011, 12:13 PM   #8
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Re: will 97 4.3 heads and intake go on older block?

92-95 was a mixed bag. Typically, the CPI engines
got them, but by 94-95 many TBI engines were
getting them as well.

91-older: no balance shafts
96-up: all had them

Some early non-BS TBI intakes wouldnt clear the BS,
But most, (or all) late TBI manifolds were redesigned
to clear the BS.

There are no clearance issues if the engine
Does not have a balance shaft.
Old 08-30-2011, 12:32 PM   #9
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Re: will 97 4.3 heads and intake go on older block?

And yes, any year heads will bolt to any year block.
Intake manifold will depend on wether heads are
Pre or post 1996 though, and the above mentioned
BS clearance issues...
Old 09-01-2011, 12:23 AM   #10
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Re: will 97 4.3 heads and intake go on older block?

thanks for all the help everyone, i'm new to chevys i've had a lot of old ford's but i had a 93 chevy blazer when i was 17 and it is my all time faverate it had the 4.3 vortec and that thing was unstopable hell i even pulled my brother's gmc 3500 out of frame deep mud with it he said it wouldnt do it ha i showed him. anyway i came across this 97 with a blown motor and the kid was sending it to the crusher so i bought it for 400 bucks, it's in perfict cond. fully loaded.
after i put in the new motor i want to put in a new style grill is that very hard?
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