Tried a search, but couldn't find anything.

Are the two blocks the same, except for the pistons? Was looking to rebuild my engine, but was thinking about picking up a zero mile GX short block (for about the same price as my rebuild) and swapping out the D17A7 pistons to the lower 9.9:1 compression D17A2 ones. Would this work / any issues? Thanks.

 

GX engines run on natural gas, so the fueling system is entirely different.

 

Let me clarify my original post, hopefully that helps. I own an EX and want to use my A2 head on a A7 block, minus the pistons. Here's what I know:

D17A2
VTEC
Found in:
2001–2005 Honda Civic EX (US only)
2001–2005 Honda Civic LX (Europe)
2001–2005 Honda Civic Si (Canada only)
2001–2005 Acura 1.7 EL (Canada only)
2000–2007 Honda Stream 1.7 (Japan)
Displacement: 1,668 cc (101.8 cu in)
Bore and Stroke: 75 mm × 94.4 mm (3.0 in × 3.72 in)
Rod Length: 137 mm
Rod/Stroke: 1.48
Compression: 9.9:1
Power (North America): 127 hp (95 kW; 129 PS) at 6,300 rpm
Japan: 125 PS (92 kW; 123 hp) at 6,300 rpm[13]
Torque (North America): 114 lb•ft (15.8 kg/m, 154 Nm) at 4,800 rpm[14]
Japan: 154 N•m (114 lb•ft) at 4,800 rpm[13]
RPM redline: 6,800 rpm
Rev-limiter: 7,200 rpm
Valvetrain: SOHC VTEC, four valves per cylinder
VTEC Switchover: 4,500 rpm
Fuel Control: OBD-2 MPFI

D17A7
Found in:
2001–2005 Honda Civic GX
Fuel CNG (Compressed Natural Gas)
Displacement : 1,668 cc (101.8 cu in)
Bore and Stroke : 75 mm × 94.4 mm (3.0 in × 3.72 in)
Compression : 12.5:1
Power : 100 hp (75 kW; 101 PS) at 6,100 rpm
Torque : 98 lb•ft (13.5 kg/m, 133 Nm) at 4,000 rpm
Valvetrain : SOHC (4 valves per cylinder)
Fuel Control : OBD-2 MPFI

 

To be fair, that's what Wikipedia knows.

All kidding aside, I do not know how the blocks differ technically, so I'm not certain if you can use the block at all or not.

 

Haha, thanks.

I pulled the trigger and purchased it. I did a part by part comparison for the two blocks. The only differences were:

1) Pistons (obviously)
2) Connecting Rods (beefier)
3) No Knock Sensor

Everything else was the same, part number-wise. Block, Crankshaft, Pins, Bolts, Oil Pan, etc. were identical. A few of the main bearings differed, but not a concern.