Honda Grom Big Valve Head

DH Motoring Verified independent store

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DH Motoring Big-Valve Honda Grom Cylinder HeadThese heads are OEM Honda heads that have been modified with larger intake and exhaust valves. We assemble heads with low friction vit on seals, dual springs, and offer optional titanium retainers. 27/23mm valve size - This head has only been confirmed to work with DHM pistons and the TB 186 and Koso 170 pistons. If you would like to use it with a different piston you can send in your piston and we can modify it. This is the largest valve head that will work with the stock bore. **Each head includes a spark plug spacer required when running our heads. Info about our portwork:DHM porting is an all out reworking of the intake and exhaust ports. The race port is aimed at maximizing high-rpm horsepower. In many cases we will cut the valve guides and raise the intake port to maximize efficiency. The chamber and shrouds will be modified as well. This is the portwork that we use on all of the race bikes. It has won multiple championships and is the only option if you want to have the most power possible from your 2v Grom head. **Allow 2-3 weeks for each head to be built before shipping Show more