'89 4.3L Cylinder Size Compared to SBC350 size (and gear drives) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-09-2007, 11:39 PM
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'89 4.3L Cylinder Size Compared to SBC350 size (and gear drives)

just wondering if my brand new keith black flat tops and my forged rods for a SBC350 would fit in an 89 4.3L engine. I heard they shared the same bore size.. both motors havent been punched out before.. so pistons are standard size..

also will a Gear drive from a 350 fit and work on a 4.3?

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Old 04-09-2007, 11:43 PM
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sbc or nothing
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Old 04-09-2007, 11:51 PM
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thanks for comin out

piston let go in my buddies old 350 so i wanna use the 6 we got left and put it in the 4.3 and put the geardrive in and sell it to my buddy for his toyota
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Old 04-10-2007, 12:18 AM
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The handy dandy Google search http://groups.google.com/groups?q=Ch...roups&ct=title
Says that the 4.3 is basically a shortened 350. your goodies should work.
Poke around in the stuff that that search brings up and I think you will find your iinfo.
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Old 04-10-2007, 12:26 AM
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4.3's bore is the same as 5.7, so yes you should be able to use them. Does anyone know if there are skirt-to-crank throw clearance issues to worry about? I know the offset rod journals make some interesting geometry down there.
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Old 04-10-2007, 04:58 AM
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Pistons and gear drive will work, rods are the same basic forgings but are clearanced differently for the 4.3 IIRC. I think they are offset slightly because of the offset rod journals. Hot Rod did a build on one awhile back, you might see if they have it on their website yet.
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Old 04-10-2007, 06:29 AM
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Quote:
Originally Posted by Hippie
Pistons and gear drive will work, rods are the same basic forgings but are clearanced differently for the 4.3 IIRC. I think they are offset slightly because of the offset rod journals. Hot Rod did a build on one awhile back, you might see if they have it on their website yet.
The 4.3L V6 has a larger diameter rod journal than the 350 V8. The change was necessary to increase the cross section of the rod journals at offset. The two are not interchangeable.

Bob
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Old 04-10-2007, 07:48 AM
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The 350 SBC Pistons will work.

The SBC Rods will not work as the crank end of the rods for a 4.3L are larger.

I would not put a gear drive on anything!

I'm prity sure the sbc timing gear for the camshaft end has a larger bolt

pattern than the 4.3L (where the 3 bolts go)

A double roller timing set would be perfect. Order it for the year 4.3L you have as some years came with a ballance shaft and are totally different.

Good luck with the swap,
Scott~
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Old 04-10-2007, 08:30 AM
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Quote:
Originally Posted by bobscogin
The 4.3L V6 has a larger diameter rod journal than the 350 V8. The change was necessary to increase the cross section of the rod journals at offset. The two are not interchangeable.

Bob

I knew SOMETHING was different..... Thanks for the clarification.
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Old 04-10-2007, 09:39 AM
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Keep in mind, if you use the pistons have it balanced. The 89 4.3 is a non balance shaft engine so the rotating assembly needs to be balanced as these engines are known shakers. If you plan to keep the computer then the gear drive is out, the knock sensor will pick up the noise as knock and retard the spark timing until it won`t run, besides that, if it`s a older non roller cam gear drive it won`t work on the 4.3 as the 89 4.3 came with a roller cam, it`ll require a `87 and up double roller timing chain for a small block chevy that came with a factory roller cam. When you remove the 4.3 make sure you have the bore size checked, if the clearence is around .005 you may as well have it bored or it`ll have piston slap so bad it`ll sound like a diesel, been there done that. I just did a rebuild on my 4.3, in the end it cost more than a small block chevy would.
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Old 04-10-2007, 08:04 PM
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4.3's out of the deal
goin with a 350.. im gonna use keith black flattops and do a mild build from there..
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