Lz9 + 4 spd manual trans in 86 GT swap

[Shaun41178(2)]

Doing this swap for Howard. Initial mock up shows there might be a clearance issue with the shift cables for the trans, once the adapter and tb go on. We shall see.

I'll post more updates as the swap progresses.

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[Shaun41178(2)]

Old 2.8 and cradle is out.

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[Shaun41178(2)]

Engine is off the cradle I'm kind of interested in trying to see if using the factory front cover and water pump assembly will be too difficult or just swap over to the fiero stuff.

Coolant hose routing and alternator packaging are the big concerns with using factory LZ components. I'll have to mock it up and see.

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[Shaun41178(2)]

Gotta trim/grind the front mount like you do on the dohc 3.4 swaps. I also trimmed some excess webbing on the oil pan. A bit off the pan and a bit off the mount instead of it all off the mount. But that's it.

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[Shaun41178(2)]

Mounted. Easy.

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[The Dark Side of Will]

Gotta trim/grind the front mount like you do on the dohc 3.4 swaps. I also trimmed some excess webbing on the oil pan. A bit off the pan and a bit off the mount instead of it all off the mount. But that's it.

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Had to slot the upper bolt hole on the bracket to get it to fit?

[Shaun41178(2)]

There is no upper bolt hole.

[The Dark Side of Will]

There is no upper bolt hole.

I must have gotten my wires crossed about which bolt hole is there and which is moved on the GenIV blocks then.

What else is the bracket attached to? One bolt ain't gonna work.

[eHoward]

Had the same thought which is why we are trying to source an 88 bracket.

There is no upper bolt hole.

I must have gotten my wires crossed about which bolt hole is there and which is moved on the GenIV blocks then.

What else is the bracket attached to? One bolt ain't gonna work.

[The Dark Side of Will]

I thought the 3900 had the upper water manifold at the back. I guess I was wrong about that.

Are the water manifolds two separate pieces or one large cover as with the Gen II & III engines?

[ericjon262]

Had the same thought which is why we are trying to source an 88 bracket.

There is no upper bolt hole.

I must have gotten my wires crossed about which bolt hole is there and which is moved on the GenIV blocks then.

What else is the bracket attached to? One bolt ain't gonna work.

I would like that mount if you don't use/want it. Let me know.

[Shaun41178(2)]

I thought the 3900 had the upper water manifold at the back. I guess I was wrong about that.

Are the water manifolds two separate pieces or one large cover as with the Gen II & III engines?

The water manifold is one piece but it's separate from the timing cover.

[zok15]

The Lucerne water manifold and alternator location may be the best for a low fab 3900 install. Think the hinge box just needs a trimming, and maybe an idler bolted to one of the PS pump mounting holes, but also maybe not.



AC or and idler down there needed:

[ericjon262]

This is still a work in progress, if you want to be the trial tester, let me know. This is based on an L shaped mount I picked up earlier, and an LZ4 block/oil pan that's been in my garage.

[Shaun41178(2)]

Interesting idea on the mount. We could do a test fit and give feedback if you want and take some pics.

I've got the front torn off and prepping for the lgd cam swap.

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[Shaun41178(2)]

Got the intakes, valve covers and pushrods out. Still need to remove timing assembly and lifters, then the lnj cam can go in

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[ericjon262]

this point on the LZ9 block is about 13mm off the pan rail, and about 130mm from the crank centerline.



however, on the LX9 (and presumably earlier blocks), the same bolt location is about 126mm from the crank centerline. both are about the same height though, at 13mm above the oil pan rail.

[The Dark Side of Will]

Are the block casting numbers different? It doesn't look like there's enough iron to move that bolt hole outboard 4mm

[The Dark Side of Will]

Got the intakes, valve covers and pushrods out. Still need to remove timing assembly and lifters, then the lnj cam can go in

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What's the point of the LNJ cam again?

[Shaun41178(2)]

Are the block casting numbers different? It doesn't look like there's enough iron to move that bolt hole outboard 4mm

The earlier blocks have the bolt pattern the same as the 2.8. there is no need to move the bolt hole out further

Eric is saying the lz9 is out a bit further. But it's close enough with a stock mount bracket to fit. If there was a second bolt boss in the lz blocks, you would prob have to enlarge the mount bracket holes slightly

Lnj cam doesn't require the bearing spacers and deletes the vvt. The lnj could possibly be reground as well