<span style="color: #800000"><span style="font-size: small"><span style="font-family: Comic Sans MS">I have a volcano s30 with a sh.18 engine. I'm looking to upgrade to .21 engine and was wondering if anybody ever did this to a volcano s30 and if so what was a good choice of engine? If not does anyone know what .21 engine would fit or what upgraded engine would fit in my truck to give me more speed and power. Thanks for any help.</span></span></span>