[70chevelle15]

Hey guys I recently bought a "rebuilt" 327 and tore down to check everything out. The motor is a 69 327 with .040" over 310p cast flat-top pistons. Compression should be somewhere from 9.5-10 depending on what head gasket I use, heads are 186 double humps. I have Nitrous Express Hitman plate system that I plan to use, only on 100hp shot, and not all the time just at the strip every now and then. What kind of ring gap should I have with the 4.040 pistons? Just stock? or should go looser?

 

[trmnatr]

Many variables but with that compression and 100hp shot i would say .022" on the top ring and .028" on the second ring - Total Seal Classic Moly, Childs&Albert or Speed-Pro rings should do the job great

 

[70chevelle15]

thanks, sounds about right