3500 swap

[Hemet8]

I asked this in another thread that was labeled different, hince not many responces. Has anybody tried to take a 3500 short bloc, then put 3100/3400 sensors on it and topend? Sounds like a good "stroker" set-up if you could.

[Guest]

RE: 3500 swap

Not as far as I know, besides, there is an issue with the 3500 crank trigger, as it has a 52x (IIRC) reluctor wheel, which is not useable by the previous ICMs to fire the coils.

[Azrael]

V6H.O. has been tinkering with a 3500 for awhile now. Don't know how far he's gotten with it though. He's documented several changes between it and the Gen 3 60*V6's besides sensor changes that won't make a swap easy. The engine's mounting points were also different off the top of my head.

[Manitcor]

RE: 3500 swap

its something im toying with, as far as I can tell I belive the 3500 crank can be modified to work with the older style timimg sprocket. Youll need some kind of adapter plate to use an older style cable type throttle body. Other than that most everything else looks like it might swap over. Though its not a direct drop in like a 3400 swap would be.

[WhiteRaider]

This would be a perfect application for the external crank trigger that has been discussed...

[Hemet8]

Anyway to take the 3500 crank, put it and the rods, pistons in a 3400 block? I don't know to much about enegines, but if this was a longer "stroke", could'nt i just machine the block to clear the longer rotating assembly? Just a thought.

[SHOoff]

I think the 3400 and the 3500 have the same stroke. Just a bit larger bore on the new motor. Which means you could probably swap over to the 3400 crank, BUT the journals on the crank are different size, so you'd have to swap rods too, then that probably wont match up to the pistons and all kinds of crap.

Also, i thought someone on domesticcrew had a solution to the TB when using the 3500 UIM on the 3400?

[Guest]

I think the 3400 and the 3500 have the same stroke. Just a bit larger bore on the new motor. Which means you could probably swap over to the 3400 crank, BUT the journals on the crank are different size, so you'd have to swap rods too, then that probably wont match up to the pistons and all kinds of crap.

Also, i thought someone on domesticcrew had a solution to the TB when using the 3500 UIM on the 3400?

It's not the rod journal size that's the problem, it's the main journal size, which has been increased again.

Midnightriderz24 is using a 4.3 S-10 TB on his 3500 UIM, with an adaptor plate.

[v6h.o.]

It's not the rod journal size that's the problem, it's the main journal size, which has been increased again.

No Chris, The Rod Journals are the ones that are bigger. The Mains are still the same.

The 3500 Crank *could* be made to fit into an older block. It wont just bolt in and go though due to the crank sensor change and you'd have to clearance the block some for clearance with the increase in bulk from the rods larger diameter now.

The crank reluctor is pressed onto the crank, If one was to take the reluctor off and have a machine shop machine in the notches into the crank in the precise local on the 3500 crank, One could use the old sensor/ecm setup. As the diameter where the new trigger is pressed onto is the same as the old reluctor notch section on the old cranks.

As other people have noted with the other changes. Its not going to be an easy simple swap.

[Guest]

It's not the rod journal size that's the problem, it's the main journal size, which has been increased again.

No Chris, The Rod Journals are the ones that are bigger. The Mains are still the same.

The 3500 Crank *could* be made to fit into an older block. It wont just bolt in and go though due to the crank sensor change and you'd have to clearance the block some for clearance with the increase in bulk from the rods larger diameter now.

The crank reluctor is pressed onto the crank, If one was to take the reluctor off and have a machine shop machine in the notches into the crank in the precise local on the 3500 crank, One could use the old sensor/ecm setup. As the diameter where the new trigger is pressed onto is the same as the old reluctor notch section on the old cranks.

As other people have noted with the other changes. Its not going to be an easy simple swap.

When did this information come about? I know inititially it was said that the mains were larger.

What's the reason for larger rod journals and what size are they?

[v6h.o.]

When did this information come about? I know inititially it was said that the mains were larger.

What's the reason for larger rod journals and what size are they?

This information is straight from GM. It was initially said by the GM guy Brad knows from powertrain that the cranks WILLNOT fit into the old blocks and that they had changed journal sizes. But it was never said it was the mains. I've measured the cranks.

The rods are now 2.250 Inch Diameter with the Rod BE now 2.375 inch.

Which is bullshit. I cannot believe they went to that huge of a rod bearing. What was wrong with the 2.0inch journal?? Its great for spinning the motor up at high rpm. The only other GM that uses that rod journal size is the 4.3L V6. Fucking larger than a BBC even...