punching the 3.4 to a 4.0

[milestonemotorsports]

I run a 3.4 out of a 96 camero in my class 7s desert race truck , we are limited to 4.0 lt. the 4.3 is not allowed , some sancioned bodys allow it but it must be stock , I want to know if anybody has taken the 3.4 up to a 4.0 through bore and stroke , I race against ford rangers the are all running the new sohc 4.0 i'm having a hell of a time keeping up with them ,i'm a very loyal to chevy , even though I race in a sport dominated by fords

[SappySE107]

Use a 3900 with a cable driven throttle body and tuned. The 3.4 is not going to be made into a 4.0 without custom everything and is not worth trying to do with the 3900 already made.

I thought the 96 camaro only came with a 3.8.

[milestonemotorsports]

does the 3900 have the same bell housing bolt pattern as the 3.4

[SappySE107]

Yes it does. You should read up on it though as its not the easiest thing to use. The stock crank trigger won't work with older computer but a standalone unit might hook right up, even with the VVT. Drive by wire sucks though so I would use a cable instead.

[pocket-rocket]

does the 3900 have the same bell housing bolt pattern as the 3.4

Yes.

Edit: Ninja'd by Ben...

[AaronGTR]

Yeah, the 4.3 probably wouldn't work easily anyway because it is based on a 90 degree block iirc, and making a 4.0 out of a 3400 would be extremely difficult and expensive, if not impossible. It would be much easier to start off with a 3900. You know the block will already be big enough and you don't have to do anything to it internally if you don't want, or you could just over bore it to 4.0 L.

[bob442]

How about the 3.6 drive train from a new camaro? 306hp wasnt it?

[milestonemotorsports]

How about the 3.6 drive train from a new camaro? 306hp wasnt it?

I have to start with a motor that is offerd as an option in a s-10 or colorado

[bszopi]

I have to start with a motor that is offerd as an option in a s-10 or colorado

How are they letting you run the 3.4L then, as it was never an option in the S-10? Anyway, if we ignore that fact, is there any restriction to what you can do to the engine? If it was me, I would keep the 3.4 (maybe bore it out .040 to bump up the displacement some), then go with the newer aluminum heads and top end. And then tune it. But again, that's if the rules allow it...

[Superdave]

3500 top end and a good cam on that 3.4 and those ford boys will see your tail lights


if you can sneak it in there swap in a whole 3500, throw in a cam and some headers. With the RWD accessories/timing cover hardly anybody would know the difference.

[geoffinbc]

What about a de-stroked 4.3L? I know we all like 660's here but if they are only going to let you run the stock iron heads then the Vortec 4.3L wins over the stock Gen I 660 heads all day long. If head swaps are allowed the a tuned 3400 3500 or 3900 would be a killer combo.

[milestonemotorsports]

How are they letting you run the 3.4L then, as it was never an option in the S-10? Anyway, if we ignore that fact, is there any restriction to what you can do to the engine? If it was me, I would keep the 3.4 (maybe bore it out .040 to bump up the displacement some), then go with the newer aluminum heads and top end. And then tune it. But again, that's if the rules allow it...

The 3.4 is a stock replacement made by gm performance fo the S-10 , I am thinking something along that line , Im thinking using the 3.1 aluminum heads . and making a custum intake out of a intake plenum to use a carb I have to use a TBI or carb.

[milestonemotorsports]

What about a de-stroked 4.3L? I know we all like 660's here but if they are only going to let you run the stock iron heads then the Vortec 4.3L wins over the stock Gen I 660 heads all day long. If head swaps are allowed the a tuned 3400 3500 or 3900 would be a killer combo.

SCORE off-road racing doesnt allow the 4.3 and the sancion body that do allow the 4.3 say it has to be bone stock , headers only , im also concerned of the extra wieght of the 4.3

[bszopi]

The 3.4 is a stock replacement made by gm performance fo the S-10 , I am thinking something along that line , Im thinking using the 3.1 aluminum heads . and making a custum intake out of a intake plenum to use a carb I have to use a TBI or carb.

Ok, yeah it is, just wasn't sure if that was part of the rules, as the Camaro 3.4 and the crate 3.4 are slightly different. Anyways...

As far as the intake goes, I was thinking about this the other night, but held back saying anything just yet. I'd have to sketch it up, but I'd think the best way to go about this would be keep the alum head lower intake, and then make a custom upper out of exhaust tubing and sheet metal. 1.5" dia. exhaust tubing is the proper size IIRC for the ports. Cut up some u-bends to merge to a box in the middle where the carb would set. Should have plenty of clearance in an S-10 engine bay for this. Just an idea!

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[Blacktree]

If you can weld aluminum, you could probably cut a hole in the top of a 3x00 upper intake, and weld on a carb spacer as your base. You could chop off the throttle body neck and weld it shut, or just install a block-off plate.

Might be easier than building an intake manifold from scratch.

Just an idea...