This is what I'm working with

[swag11]

This is my first rc truck its not much but just to get me started and to get me familiar with things, would i be able to use a .12 or .18 on this truck.

1/16 Scale Goliath Nitro Gas Powered 4WD Off-Road Racing Buggy (NEW Version)
Ready To Run
4 Wheel Drive
Shaft Drive
Front and Rear Ball Raced Differentials
Race Spec 45cc Oversize Polycarbonate Fuel Tank
Upgraded (7CXP) Balanced Nitro Gas Motor
Pull Start
High Flow Air Cleaner
Factory Tuned Exhaust
Front and Rear Differentials with Bevel Gearsl
Full 4 Wheel A-Arm 100% independent Suspension
Double Wishbones
8 Aluminium Cap Oil Filled Adjustable Shock Absorbers (55% More travel)
Adjustable Height
Adjustable Toe In, Toe Out
New Even Lighter Smaller Front and Gear Boxes
New Spiked Tyres
2mm Solid Anodised DHS Aluminium Chassis
Disc Braking
Factory Installed Servo Saver
Aluminium Upper Deck
Front and Rear Spring Buffered Bumpers

 

[swag11]

Nobody has any info for me????

 

[Racer 1966]

I've never seen one of those rigs, what engine does it have now?

 

[olds97_lss]

I've never seen one of those rigs, what engine does it have now?

.07 CXP is the engine. That's really small... not sure if it's footprint is smaller than a typical small block or not. Kind of like the XRay NT18MT. Except that engine is a .08ci and is a side exhaust.

I found a .7cxp, it looks side exhaust as well:
http://www.jingyer.com/product.aspx?id=728

Either way, still don't know it's footprint. You may have to measure the distance between the mounting tabs and bolt holes on the tabs to see what you can find that will shoe-horn in your rig.