Would reversion be a concern 420hp
 

Would reversion be a concern on a 420hp crane 132561 stock bravo exhaust. Selling my engine and purchaser is concerned using stock bravo 330 exhaust. Lsa in cam is 114 motor i
https://cimg3.ibsrv.net/gimg/www.off...82c41f1be4.jpg
s stock 420. I don't want to give him incorrect info. I ran dry gills.
thanks.

Possibly. There isn’t a hell of a lot of overlap but it does exist.

It is probably borderline for reversion at idle with stock Merc cast iron exhaust.
To help reduce the chance of reversion, bump the idle up so its around 750rpm in gear.

Thanks for the resonses guys i sold the engine going to throw in a set of gills for him