smashed electrodes.

[thesoultaker2117]

Stupid phone. Slower...shoot me a text. 8145058437

[camatv]

if your running 500ft its overheating and causing the deto.  get a EGT and USE it.  i bet you don't have enough fuel flow to control the last 200 ft of accumulated pipe/ engine temp..  i have seen this a LOT around here.  421's especially.  run 250-300ft and they are fine  run 400ft and they are about to let go  run 500ft+ and its bye bye motor.   takes a lot of fuel OR proper atomization and delivery to run that far and make the motor live.  rember  your pipe temps are always climbing on a full throttle run

[thesoultaker2117]

What would you do to fix the issue? Run a fuel pump?

[n2otoofast4u]

Im just a dummy, but that far with that much comp seems too much of one or the other. A really good dome design and get the comp down a bit and I bet things start to come around. I know you are on gas but do you also have oversized bowls? Id double/triple check the venting and play with needle/seat size to get it right on the verge of overflow.

[J-Madd]

What was the squish with the old domes? Saw another thread where "registered user" mentioned tightening the squish to get rid of deto, so I researched it and it seems that is a good idea. It does raise MSV which can lead to deto if it is too high though. You can run a lot less squish than that but it's gonna raise the compression too and lower port timing if you just do it with a base gasket change. Big bowls shouldn't be needed if you're filling the ones you have, as n2o suggested. I'd start with pulling timing even more until the problem stops assuming the bowls aren't running dry. I have a motor that rattles plugs loose every pass and have tried everything. I detuned it so much it wouldn't run but still rattled plugs. My next step is new domes and/or tighten squish. What did you say the squish band is? Smaller = less deto prone in general.