Question about 1995 Chevrolet Blazer

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Is a 95 and a 99 4.3 block the same could i swap out heads and intake to make the 95 work in my 99

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The blocks are the same, as far as heads and intakes i am not sure. even though they are both vortec engines it seems that every year vehicle engineers change something on the intake and fuel systems to raise the cafe ratings or meet EPA guidelines. the difference might be as subtle as different intake port shapes. compare the two, what i do is take pictures of one and compare it to the other.

Posted on Jan 20, 2013

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Posted on Jan 02, 2017

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SOURCE: Head Swap

The 2.8 is a 60 degree engine, and the 4.3 a 90 degree engine. Meaning the bank of the cylinders in relation to the center line of the engine. If you were asking about a 3.8 and 4.3 I'd say yes you could, as each of these is based on a 305, and 350 respectively. I don't believe the 2.8 and 4.3 have the same cylinder head bolt patterns to allow correct mounting to the block. Additionally you have to be sure about valve opening clearance requirements using the larger cylinder head because of the smaller bore of the 2.8. The 4.3 heads have larger valves, and may not clear the block surrounding the bore. The chamber of the 4.3 heads might extend onto the flat surface of the 2.8 block which is an engineering no-no due to hot spots/dieseling and other problems you would design into this monsterous mating.
I like the way you think though. Chevrolet has been doing this since they introduced the first small block back in the 50's.
You are right about the 2.8 being a dud. I had one, and it couldn't get out of its own way. You might be better finding a good low mileage 4.3, and grab the mounts along with the vehicle you got the engine from. Also be sure you get the computer, and harness. If that vehicle is injected and computer controlled, and yours is not, there would be a whole nother host of issues to deal with that you don't sound like you would wanting to encounter. In that case you might as well drop a small block in, because the issues would be similar.

Posted on May 21, 2009

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1 Answer

95 Blazer,and 2000 blazer do they come with the same engine and trans, and will they match up the same wire wise


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Head Swap


The 2.8 is a 60 degree engine, and the 4.3 a 90 degree engine. Meaning the bank of the cylinders in relation to the center line of the engine. If you were asking about a 3.8 and 4.3 I'd say yes you could, as each of these is based on a 305, and 350 respectively. I don't believe the 2.8 and 4.3 have the same cylinder head bolt patterns to allow correct mounting to the block. Additionally you have to be sure about valve opening clearance requirements using the larger cylinder head because of the smaller bore of the 2.8. The 4.3 heads have larger valves, and may not clear the block surrounding the bore. The chamber of the 4.3 heads might extend onto the flat surface of the 2.8 block which is an engineering no-no due to hot spots/dieseling and other problems you would design into this monsterous mating.
I like the way you think though. Chevrolet has been doing this since they introduced the first small block back in the 50's.
You are right about the 2.8 being a dud. I had one, and it couldn't get out of its own way. You might be better finding a good low mileage 4.3, and grab the mounts along with the vehicle you got the engine from. Also be sure you get the computer, and harness. If that vehicle is injected and computer controlled, and yours is not, there would be a whole nother host of issues to deal with that you don't sound like you would wanting to encounter. In that case you might as well drop a small block in, because the issues would be similar.

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good luck

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1 Answer

Swap out the heads


u can but u will probly have to time sert the block . the block strips out easly. so when doing the head swap i would go and order the block kit and have it on hand

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