The 6573-You Build Stroker Kit includes all the internal parts you need to assemble a Modified, Outlaw or Open style small block.
The crank included is our custom Billet crank that offers .175" longer stroke than a Honda GX200 or Clone 196cc crank and .135" longer than a Predator 212cc crank. It is offered in two different materials to suit your needs. The standard 6573-C is machined from a solid bar of 4340 Chromoly steel and is far superior in strength over OEM cranks. The 6573 crank is machined from a solid bar of Super Alloy material that is more dense and offers more strength than the Chromoly. Both cranks are machined for cams up to .325 lift and allow the compression release to be left on the cam for pull rope starting. (where the SA rules call for no electric start). Both cranks are precision balanced when using piston sizes 2.678" or 2.756". Piston sizes from 2.815" to 3" may require re-balancing.
The kit allows you to choose from two different length custom Billet connecting rods. The rod number 6765 is 3.525" in length and is what we call the drop in rod. It was custom made with the DIYer in mind. This rod can be installed without having to cut down the dome of the piston in most blocks. (Some blocks with deck heights previously cut shorter may have to be slightly trimmed). This will save time and money on your build. The other option is rod number 6265. It is 3.625" in length and is the builders option. It will require .085" to .095" be cut off the dome of the piston to set the "in the hole" height according to the blocks deck height. We recommend that you DO NOT cut more than .100" off the dome, this could cause the top of the piston to be weak and cause unwanted flex that will damage the piston and rod. All rods come with bolts, bearings and installation instructions.
You have a verity of pistons sizes to choose from with this kit ranging from 2.678" up to 2.835". As stated above you have two different rods lengths for the kit and this means you have two different piston styles to also choose from according to which rod you use. The first piston style is the 3 ring Wiseco piston, part numbers 17-2678XC, 17-2756XC, 17-2815XC and 17-2835XC. This piston will be used with the 6765 drop in DYI rod. It has an extra ring than other models of Wiseco piston. This will help hold more cylinder pressure during combustion, and that equals to more power. It will also aide in longer run times between re-builds. The other piston choice is the standard 2 ring Wiseco Piston. It will be used with the 6265 builders rod. This piston will have to be cut .085" to .095" to set the deck height according to block used. The 2 ring piston part numbers are 11132PS, 11132P94, 11132P233 and 11132P253. All the piston will come with rings and piston clips. (FIY the 3 ring pistons can NOT be used with the 6265 builders rod. Not enough dome material to cut the piston down)
Wrist pin number 6521 is included with the kit. This is our HD .490 wrist pin that we recommend using with all of our Billet rods that use the .490 wrist pin.
The kit also gives you a choice of our one of a kind Billet side covers to use. These side covers are a must when building higher compression/high horse power engines. Along with the rigidness of the Billet material, they incorporate all 4 dowel pins in the block. This really helps to keep block fatigue to a minimum. The Billet side cover also includes dual ball bearings on the crank shaft. This gives 4 points of contact which greatly reduces crank shaft flex and block flex, giving longer life to you crank and block. The Billet side cover uses a rubber o-ring for the ultimate crank case seal and comes with all the hardware needed as well as installation instructions. The one you will need will depend on which block you are using. Honda GX200, BSP Clone 196cc, Hemi 212 and the BSP 212 blocks will use part number 6057 side cover. The Predator 212 NON Hemi blocks will use part number 6058.
No performance kit would be complete without a choice of an ARC Billet flywheel. This kit will offer 5 different flywheels to meet the needs of any Mod engine. The standard model is the tried and true 6619. This is a non adjustable Billet flywheel that weighs 3.5lbs and can be used with a pull rope starter. It is set at 32 degrees timing with a stock key. The next option is the new 6689 Speedway flywheel. This is our newest flywheel addition. It is also a non adjustable flywheel that weighs 3.4lbs and will also work with a pull rope starter. It is set at 32 degrees timing with a stock key, but the extra benefit it offers is the low drag fin design. It moves enough air to cool, but has less drag than any other finned flywheel we offer. This will help free up more power in the upper RPMs. For those wanting a smaller diameter flywheel we offer the 6607-GX200. This is a 5 3/4 diameter flywheel commonly known as the 3hp flywheel and weighs 3.3lbs. It is much smaller in diameter than the 6619 and 6689. This will produce much quicker acceleration and more out of the corner pull. It will NOT work with a pull rope starter, a hand held electric starter must be used. The 6607-GX200 is an adjustable hub flywheel that offers 14 degrees of timing advance in 1 or 2 degree increments. Adjusting the timing is quick and easy to do on the dyno or at the track. Just loosen the 6 bolts on the hub, make an adjustment and tighten them back down. Just that easy. This flywheel will come with a coil bracket. This kit will also offer a choice of two Billet flywheels for those of you that want to use the Briggs PVL ignition coil. Those flywheels are the 6621 and the 6617-H. The 6621 is a non adjustable flywheel for the PVL ignition that can be used with a pull rope and comes set at 29 degrees with a stock key and weighs 3.4lbs. The 6617-H is an adjustable timing flywheel that offers the same quick timing adjustments as the 6607-GX200 and weighs 3.8lbs. It will NOT work with pull rope starting, must use hand held electric starter. All the Billet flywheels offered have cooling fins that can be used with all types of Gasoline and Methanol.
Timing recommendations for the 6619, 6689 and 6607-GX200 with most Gasoline engines is 30-32 degrees with a .050 to .060 coil gap. Methanol is 34-36 degrees with a .050 to .060 coil gap. The PVL ignition flywheels 6621 and 6617-H will be a little different. The PVL ignition does not retard as the RPMs increase so you do not need as much timing advance. Recommended timing for the 6621 and 6617-H for most Gasoline engines is 29-30 degrees with a .040 to .045 coil gap. Methanol is 32 to 34 degrees with a .040 to .045 coil gap.
We recommend that all Billet flywheels be lapped to the cranks shaft. The NON adjustable flywheels are set at 32 degrees timing with the stock key sent with the Billet crank. You will not be able to use any aftermarket offset timing key with this crank shaft. If you need more or less timing than 32 degrees we recommend lapping the flywheel and setting the timing with a degree wheel without a key, then torquing down. All flywheels listed here are required to be torqued to 65 ft/lbs. We have how-to instructional videos on this site as well as on Facebook and YouTube under ARC Racing that explain lapping, timing, torquing and removing Billet flywheels.