Hi, a 1.80 is a 30cc, I am sure you can find a nice gas 30cc gas or use the 1.80 engine. The chart below is what I use when I want to know the difference.
<div><span class="Apple-style-span" style="font-family: 'Times New Roman'; font-size: medium; "><table height="335" cellspacing="0" cellpadding="0" width="75%" border="0"> <tbody> <tr> <td valign="middle" align="left" width="730" bgcolor="#000066" height="21" colspan="5"> <p align="center">
<font face="Arial" color="#FFFFFF" size="3">Cubic Inch to Cubic Centimeter Conversion Chart</font></p> </td> </tr> <tr> <td valign="middle" align="center" width="181" bgcolor="#E1E1E1" height="21"><font face="Arial" size="2">
Cubic Inch</font></td> <td valign="middle" align="center" width="181" bgcolor="#E1E1E1" height="21"><font face="Arial" size="2">
Cubic Centimeter</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="179" bgcolor="#E1E1E1" height="21"><font face="Arial" size="2">
Cubic Inch</font></td> <td valign="middle" align="center" width="172" bgcolor="#E1E1E1" height="21"><font face="Arial" size="2">
Cubic Centimeter</font></td> </tr> <tr> <td valign="middle" align="center" width="183" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.049</font></td> <td valign="middle" align="center" width="183" height="21"><font face="Arial" size="2">
.8</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="184" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
1.20</font></td> <td valign="middle" align="center" width="186" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
20.0</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.09</font></td> <td valign="middle" align="center" width="184" height="21"><font face="Arial" size="2">
1.5</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="184" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
1.50</font></td> <td valign="middle" align="center" width="186" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
25.0</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.15</font></td> <td valign="middle" align="center" width="185" height="21"><font face="Arial" size="2">
2.5</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
1.80</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
30.0</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.19</font></td> <td valign="middle" align="center" width="185" height="21"><font face="Arial" size="2">
3.1</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
2.00</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
32.8</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.21</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
4.1</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
2.40</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
39.3</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.29</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
4.8</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
2.70</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
44.3</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.35</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
5.7</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
3.00</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
49.3</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.40</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
6.5</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
3.50</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
57.4</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.46</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
7.5</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
4.00</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
68.6</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="20"><font face="Arial" size="2">
.50</font></td> <td valign="middle" align="center" width="186" height="20"><font face="Arial" size="2">
8.2</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="20"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="20"><font face="Arial" size="2">
5.00</font></td> <td valign="middle" align="center" width="172" height="20" bgcolor="#FFFFFF"><font face="Arial" size="2">
82.0</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.61</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
10.0</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
5.50</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
90.2</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.80</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
13.0</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
6.00</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
98.4</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#FFFFFF" height="21"><font face="Arial" size="2">
.91</font></td> <td valign="middle" align="center" width="186" height="21"><font face="Arial" size="2">
14.9</font></td> <td valign="middle" align="center" width="10" bgcolor="#000066" height="21"></td> <td valign="middle" align="center" width="178" bgcolor="#F3F3F3" height="21"><font face="Arial" size="2">
6.5</font></td> <td valign="middle" align="center" width="172" height="21" bgcolor="#FFFFFF"><font face="Arial" size="2">
106.6</font></td> </tr> <tr> <td valign="middle" align="center" width="184" bgcolor="#000066" height="21"></td> </tr> </tbody></table></span></div>