3500 Swap Information

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3500 Swap Information

Post by 2.2H8TA »

I'm going to be having a 3500 swapped into my 94 Z26. I'm in need of a list of the parts and modifications needed to make this work. I'm keeping my 4t60e, and I'd also like to NOT go obd2. If someone would be kind enough to post this info here for me it would be very much appreciated. I need this asap, as my car is in the shop with a cracked head. This will also serve as a sort of guide for my mechanic to refer to during the swap.


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Re: 3500 Swap Information

Post by 3X00-Modified »

There is no guide or specific list... also OBDII is not a requirement since you can buy OBDI.5 tuning equipment... strongly advised to get maximum results from the swap otherwise you risk damaging the engine or just driving around a turd because it cant correct enough. Larger injectors are definitely suggested... stock 17lb ones will not suffice.

Short list of stuff that you need to possibly fab or make is the AC compressor will only bolt on with the two block bolts, the oil pan one is not lined up properly and it's also about 1/4" away from touching the pan boss all together so something would have to be made to adapt this somehow, My solution is still in the works. Second the bracket that holds the transmission to the back of the block has no boss's to bolt to since they moved on the 3500... You need to fab a new bracket completely for this location. And the only purchasable thing to the 3500 swap is getting an external crank trigger assembly OR internal trigger wheel... whichever you prefer, Britishcarconversions.com has these.

After that, all standard 3400 swap info applies... Search for the 3400 swap guide... and honestly putting a 3400 in it may be easier for your mechanic to do without requiring custom fabrication.

I hate to say this but these kind of swaps are NOT suggested to have a shop/mechanic do it unless they KNOW what they are getting into. If it's completely foreign to them then your just asking for trouble and in all honesty I can't even see them wanting to take on the job due to the liability that could be at hand.


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Re: 3500 Swap Information

Post by 2.2H8TA »

I'm not worried about the A/C, that is if it can be deleted on this motor like the 3100. I just bought a delete pulley for the 3100, and it's on now. I will talk to him about the mount fabrication. The guy is good, but obviously has never done this before. Do you have a photo of this mount modification? What injectors should be used?


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Re: 3500 Swap Information

Post by 3X00-Modified »

I don't have photo's... This is the first 3500 that I'm swapping in my car this year and I'm only at engine tear down/prep stage... I haven't had time to mock anything up.

Injectors probably need to be at least 19lb/hr if not 22's. I' not sure what stock 3500 ones are but any injector change will require re-tuning... no questions asked.

Regarding AC delete, look online for delete pulleys for the applications... 04-06 malibu and such.


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Re: 3500 Swap Information

Post by 2.2H8TA »

Ok, what kind of injectors am I looking for here? I think I'm gonna be forced to go 3500, because I cannot seem to find a decent price on a 3400 with decent miles on it. I found a 3500 for really cheap locally and it's hard to pass up. I have to talk more to the mecanic doing the work, just so I know he's confident he can pull this off. If I could find a 3400 for the price I found the 3500 for I'd do that to keep it more simple, but unless the place that has the 3500 has one, it's 3500 or my 150k+ mile 3100 getting put back in. 3500 seems like the smarter choice at this point, considering cost.


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Re: 3500 Swap Information

Post by 3X00-Modified »

Don't forget the additional crank trigger costs to even get the 3500 running... And if you plan on keeping the 3500 upper intake you also need a TB adapter... That's close to 200 in additional parts.

External trigger is 145, egr adapter if your keeping that is 50 and the TB adapter is 55.


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Re: 3500 Swap Information

Post by Money pit Beretta »

One day I'd like to know if the rear cylinders burn too much oil when using a 3400 upper on a 3500. Hotter pulgs needed?


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Re: 3500 Swap Information

Post by 3X00-Modified »

who said that?

In my eyes the tunnel on the 3500 intake is a worse design...

http://www.beretta.net/forum/viewtopic. ... 56#p134156


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Re: 3500 Swap Information

Post by heavywoody »

I wonder if that tunnel was removed, what the flow characteristics would be; similar to what the picture from the other thread shows, but not putting an SC on top of it...


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Re: 3500 Swap Information

Post by 3X00-Modified »

Not sure, No one really has ANY flow characteristics documented for either intake... I think I'm also the only one who's gone to the drag strip and changed it between runs and only saw a .05 difference in times... aka negligible... I'm only going with the 3100 one this time around for hood clearance with the direct port spacers, that right front corner sits too high and would hit the hood.


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Re: 3500 Swap Information

Post by Asylum »

Jon unless you did actual A-B-A tests on the UIM it doesn't really tell you anything, and you're right, .05 run to run is somewhat allowable.

GM put that tunnel in there for a reason, after what we can only imagine was a lot of testing.


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Re: 3500 Swap Information

Post by heavywoody »

We would hope... but GM has also cut a LOT of corners.

That intake may have been designed for day to day efficiencies. Allowing maximum airflow to cylinders 5&6? Nope.

Hence the issue some people (Rodney off the top of my head) has been having with those cylinders on boosted applications.

Or at least that's how my thought process puts it... lol


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Re: 3500 Swap Information

Post by 3X00-Modified »

I'll have to see if my lower end shows any signs of flow differences since I've been running that intake with my nitrous spray for quite a while now.


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Re: 3500 Swap Information

Post by heavywoody »

It would be awesome if we could monitor individual cylinder performance (temps, pressures, etc). Too bad the software/sensors we have to monitor doesn't help with that at all.


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Re: 3500 Swap Information

Post by 3X00-Modified »

Well we could monitor cylinder temps with EGT sensors if we wanted to spend the money on it... Honestly I just haven't seen any detrimental issues to justify spending the money to monitor this stuff... Now if I were melting spark plugs or cracking ring lands that would be a different story.


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