SyTy in later trucks?

[phunk]

Anyone know of a resource I can use to study variances in different generations of the 4.3L?

I am researching the possibilty of a Sy/Ty engine or hybrid Sy/Ty/Vortec combo as an alternative to the 5.7 swap I have been getting ready to pull the trigger on for my '96 4.3L S10 4x4.

My research goal is to find out the most cost effective 450rwhp long block build I can come up with that will bolt into my truck and allow me to use my existing AC and accessories if possible.

For example, questions I would have; Is the SyTy crank forged and is it compatable with my current block? Or do I not even need an upgraded crank? Would a full SyTy longblock bolt up into my truck if I took care of the engine management system on my own? Etc Etc.

I am not concerned with the manifolds, turbo(s) or plumbing, as I can fabricate that myself. Right now I am just trying to figure out the long block / intake mani combination that would be the most compatable with my truck.

Any advice would be appreciated. Thanks.

 

[phunk]

Re: SyTy in later trucks?

my bad, i just saw there is a seperate forum section for this.

sorry.

 

[jjorgensen52]

Re: SyTy in later trucks?

for cost effective, you aren't going to win with a turbo 4.3 into a N/A lat model truck unless you score a wrecked syty.
all the accesories and the computer from your truck will work on a 96-99 350, all you have to do is change the motor itself. They use the same CMPI injector, just one has 2 more poppets on it.

 

[critical]

Re: SyTy in later trucks?

If you search for "holy grail of 4.3 info" itll give you a good place to start as far as casting #s go.

 

[phunk]

Re: SyTy in later trucks?

for cost effective, you aren't going to win with a turbo 4.3 into a N/A lat model truck unless you score a wrecked syty.
all the accesories and the computer from your truck will work on a 96-99 350, all you have to do is change the motor itself. They use the same CMPI injector, just one has 2 more poppets on it.

Your absolutely right, I could do the 5.7 for dang cheap and not a lot of work. The only thing is I prefer the 4.3 when it comes to engine bay space... plus I would end up having to get some type of power adder on the 5.7 to get the truck to be quick, and then I might be spending just as much to get there as if I used SyTy parts. If I use the SyTy exhaust manifolds as a foundation, I can end up with a pretty easy to fab turbo setup for my truck.

I think the CMPI injection on my engine is the biggest problem.. because it doesnt appear the SyTy intake manifold will clear my accessories even if I modified it for my heads - and I am not sure of any other true port injection intake manifolds for the 4.3L - that would leave me stuck with this proprietary injection setup that is essentially not upgradable.

I have got to keep researching this. Thanks!

 

[phunk]

Re: SyTy in later trucks?

If you search for "holy grail of 4.3 info" itll give you a good place to start as far as casting #s go.

I will take a look, I appreciate the advice.

 

[phunk]

Re: SyTy in later trucks?

Well after going thru the holy grail of 4.3L info (thanks a ton, critical)...

It appears that the SyTy crank and rods wouldn't be any type of upgrade over my existing 4.3L components, and that only the pistons are really different to accomodate the forced induction.

If thats the case, perhaps a set of eagle rods and wiseco or SRP pistons would be all I need to build my long block with, throw on some SyTy manifolds, and figure out an intake/injection combo.

 

[jjorgensen52]

Re: SyTy in later trucks?

Your absolutely right, I could do the 5.7 for dang cheap and not a lot of work. The only thing is I prefer the 4.3 when it comes to engine bay space... plus I would end up having to get some type of power adder on the 5.7 to get the truck to be quick, and then I might be spending just as much to get there as if I used SyTy parts. If I use the SyTy exhaust manifolds as a foundation, I can end up with a pretty easy to fab turbo setup for my truck.

I think the CMPI injection on my engine is the biggest problem.. because it doesnt appear the SyTy intake manifold will clear my accessories even if I modified it for my heads - and I am not sure of any other true port injection intake manifolds for the 4.3L - that would leave me stuck with this proprietary injection setup that is essentially not upgradable.

I have got to keep researching this. Thanks!

There is a manifold that would be good for this swap in your truck but it won't work with the stock intercooler.... the new 4.3 Marine manifold (introduced in 04 if I am not wrong).
Check it out here That will allow you to run standard injectors, and it can be run on your heads without being modified. They come on ebay occasionally. It will mean a little more work for the intercooler, but you will save a lot of work in other areas

Here is an injector setup
http://cgi.ebay.com/ebaymotors/GM-V...008QQitemZ180090721187QQrdZ1QQsspagenameZWD1V

As far as I know the throttle body is the same, the upper plenum is different because it doesn't have the fuel line and wiring pass throughs

 

[phunk]

Re: SyTy in later trucks?

Great information, thanks!

Up until now, I was thinking a Vortec modified SyTy lower, with a SyTy upper with the plenum chopped off and fabricating a new plenum top for it with a throttle flange on the driver side, and probably flange it for my current stock throttlebody. I have seen options like the Edlebrock manifold mod'd for port injection, but I really like the idea of having a true surge plenum behind the throttle and equal runner length and shape which the SyTy manifold offers.

I am going to have to search for more info on this Marine manifold. I wonder if I can buy it new from GM. At the moment, I am concerned that it might be cast iron based on the pic in the link you provided! Aluminum is, of course, the only way to roll!

-charles

There is a manifold that would be good for this swap in your truck but it won't work with the stock intercooler.... the new 4.3 Marine manifold (introduced in 04 if I am not wrong).
Check it out here That will allow you to run standard injectors, and it can be run on your heads without being modified. They come on ebay occasionally. It will mean a little more work for the intercooler, but you will save a lot of work in other areas

Here is an injector setup
http://cgi.ebay.com/ebaymotors/GM-V...008QQitemZ180090721187QQrdZ1QQsspagenameZWD1V

As far as I know the throttle body is the same, the upper plenum is different because it doesn't have the fuel line and wiring pass throughs

 

[jjorgensen52]

Re: SyTy in later trucks?

According to the page:

The new Integral Air Fuel Module (IAFM) incorporates
several features into one integral assembly. The bottom of
the inlet manifold is made of iron and the top is made of
aluminum. Integrated into the module are a stainless steel
fuel rail, stainless steel tip fuel injectors, and a throttle body
that includes a Throttle Position Sensor (TPS) and an Idle Air
Control (IAC) motor.Stainless steel fuel rail. Stainless steel tip fuel injectors

I'm going to say that it can't be much heavier than the hunk of aluminum the CMPI system uses, and the newer style vortec lower isn't exactly a featherweight either (have on sitting in my garage actually).

With that said, I do not know if there is an aluminum upgrade available (this is the standard fuel injected motor that mercruiser uses, so there may be) but I do know that with a decent cam in it that motor makes 230 hp NA. My Ty motor made 260 hp with no boost (vortec heads and a 422, slighlty more aggressive cam than the CMPI profile) and 492 hp at 18 psi, so in theory anyway that motor ought to go to about 450hp under pressure.

 

[phunk]

Re: SyTy in later trucks?

Have you got a link where I can read about your truck and your mods?

According to the page:


I'm going to say that it can't be much heavier than the hunk of aluminum the CMPI system uses, and the newer style vortec lower isn't exactly a featherweight either (have on sitting in my garage actually).

With that said, I do not know if there is an aluminum upgrade available (this is the standard fuel injected motor that mercruiser uses, so there may be) but I do know that with a decent cam in it that motor makes 230 hp NA. My Ty motor made 260 hp with no boost (vortec heads and a 422, slighlty more aggressive cam than the CMPI profile) and 492 hp at 18 psi, so in theory anyway that motor ought to go to about 450hp under pressure.

 

[jjorgensen52]

Re: SyTy in later trucks?

Yep, in my sig :lol:

The Mercruiser manifold is not cheap new (check this site for a complete parts listing) but they do come up for a few hundred on ebay once in a while. I would watch for that if you wanted to go this route.