If anyone is interested in building a Fox speed engine, the prefered crankcase is up on eBay. Not my auction btw.

https://www.ebay.com/itm/225639076072?_trkparms=ni_actn%3Anav%7Cni_nt%3AWATCH_ITEM_ENDING_SOON%7Cni_apos%3A1%7Cni_sg%3A1%7Cni_pos%3A1%7Cni_st%3ANEW%7Cni_wh%3A1%7Cni_nid%3A605531375405%7Cni_nsid%3A225639076072%7Cni_et%3A1688345809000%7Cni_bn%3A1&_trksid=p2380424.m570.l5997

MM

Oh, my! a tether car engine! 

In reality, there is no rule that limits modification of engines in Fox 35 Stunt Speed.  It's wide open to machinists to make and use whatever they can.

Like most older modelers, I have large stash of Fox 35 Stunts that I have run hard and no longer give contest performance.  I don't need few fifties enough to try to pass them off to suckers on Ebay.

NOT TRUE, u band my R/V version at Brodaks RAD

My Fox 4011 got bann too but only for displacement. Hey Bob we were really out there with the mods weren't we.

That case is the good one because it has the head bolt bosses, the wart bypass (biggest) and the heavy exhaust bridge.

MM