what engine for hellfire ss will os .30 max fit in it

yea the OS .30 will fit it, my favorite is the picco .27 and the picco .28. Very Very good motors. The picco .27 is what i perfer. There discontunued on the ofna web site. www.nitrohouse.com still sells them. I run a AB Moded picco .27 in my jammin Crt and it hauls *****! never had suck a good engine that will take a beating like this one. I had a OS 30 Vg in my 2 inch ext revo and loved that one too! soo easy to tune. idk what happened but lost compression after 3 gallons...or a nova rossi 821!!! hehehe that will get her going

I you're racing go for a 21 racing or a good .28. For racing if you like OS I'd choose vspec