swapped 3500 heads

[bszopi]

http://www.pushrods.net/

[Identity Crisis]

i dont see any real problems from any other hybrid. you'd have to drill the block for the LIM to block gaskets just liek putting 3500 heads and intakes on a 3400. i haven't looked much at 3500's, so i dont know a lot about the coolant lines and such......

Is there a link to do this proceedure? Not heard of this being done yet so I am unsure what would be needed and where.

thanks

[bszopi]

I just looked at my 3500 block about an hour ago and was thinking about making a template in CAD and converting to a PDF to put up on the site. Then people can print it out, cut it out, place it and drill the holes. Does this sound like a good idea (ie, should I spend the time to do it)?

[SappySE107]

Yeah, that sounds like a good idea to me. As more and more people learn about the 3500 top end, I think there will be plenty of people wanting the esiest way to go about drilling those holes. Hell, I gotta do it soon as well on the 3400 im building

[SappySE107]

Would a scan help? I can probably scan the gasket in acrobat.

[bszopi]

I have the gaskets here as well, so I can do it just as easily.

[Identity Crisis]

If you would be so kind that would be great. It would help alot of people that are getting interested in this kind of swap. As if that is all I have to do I will do the head work w/springs etc that I have bought for a 3400 head install and do it all to a 3500 Head instead. Is there anything else that I should know before I start hunting down a set of heads?

[Superdave]

If you would be so kind that would be great. It would help alot of people that are getting interested in this kind of swap. As if that is all I have to do I will do the head work w/springs etc that I have bought for a 3400 head install and do it all to a 3500 Head instead. Is there anything else that I should know before I start hunting down a set of heads?

hunt now while they're cheap

[SappySE107]

You will need the lower intake as well. I would just get a complete motor if it were me, unless I had a low milage 3400 already.

I am going to change the 3500 top end swap kit on the store now that I have the FPR adapter to fit the 3500 plenum. I think ill add options for performance as well this time around to drop the base price.

[Joseph Upson]

About the pushrods, Comp Cams sells a cutting bit, blank rods, and the ends for those with a sturdy enough drill press to make their own.

6" rod blanks- $3.87 ea K7805-1
Ball ends- $1.34ea TT5-1
Cutting bit- $43.73 KD516

Keeping it simple and cheap- start with a good set of stock V8 rods if you have some laying around that can be cut down to the proper length, savings- (12 x 3.87) + (12 x 1.34), and if you do it yourself the tolerance can be as close as your effort.

I considered this route months ago upon receiving my reground cam. I checked with Schneider racing about this issue and was told the .040 shaved off the base circle of the cam would not be a problem, they said the lifter will pump up the difference. I don't know where they got their info from, but once the cam was installed and the rockers tightened into place, there was no play in the rocker to valve stem contact. I'll give it a try and see.

[SappySE107]

I think we need some shorter than 6" and some longer. Ill check into it though since I would then be able to make them custom per application. If we can use a slightly larger diameter pushrod, that would be sweet. Thankfully our pushrods are short so deflection shouldn't be so bad anyway. With really stiff springs though, the stiffer the pushrod, the better.

[SHOoff]

I'm a little unclear on this one. Can the 3400 upper be used with the 3500 lower? If so, what's the advantage/disadvantage of this combo?

Brad - I think that would be awesome if you made a template for drilling out those holes.

[Joseph Upson]

I think we need some shorter than 6" and some longer. Ill check into it though since I would then be able to make them custom per application. If we can use a slightly larger diameter pushrod, that would be sweet. Thankfully our pushrods are short so deflection shouldn't be so bad anyway. With really stiff springs though, the stiffer the pushrod, the better.

That's just what I sourced, you can get the blank rods in different lengths and diameter.

[RedBird]

yes the 3400 upper can be used with the 3500 lower, and you'd do that so you could use the 3400 fuel rail and injectors and fpr and not have to buy the adapter here or grind the neck of the 3500 plenum... also there's a height difference in the injectors IIRC but i dont remember if it makes a difference which upper is used with which injectors

[Superdave]

the 3400 plenum will fit but dosen't clear the 3500 fuel rail, you'll have to use the 3400 rail... then it'll fit perfect.

I believe the 3500 rail makes up the difference between injector heights, i'm still going to try to use the 3400 rail w/3500 injectors though... i'll post pics later..