ICON 9976 with Magnum Heads?

A few “hand grenade and horse shoes” compression calculations. None of these numbers are going to be exact to the degree calculated but this will give you some idea. With the advertised compression height of 1.675 it should be about .012 down the hole. Those PermaTorque gaskets usually come in between .045-.053 compressed thickness and all points in between so 10.2-12cc’s, or .1 point of compression for the bore and stroke volume. Going by those parameters in a stock deck height block and a 62 cc head you’d have between 9.9-10:1 compression. An SCE .060 pro seal gasket SCE Pro Seal Composite Head Gaskets 569096 would give you somewhere close to 9.8:1. In the far corners of the inter web I have read that the severe duty PermaTorque 521SD come Fel-Pro Head Gaskets 521SD come in on a consistent.054 compressed thickness, and with the 4.18 inch bore have a volume of 12.2 ccs, or 9.93:1. A Fel-Pro 1008 HP gasket https://www.summitracing.com/parts/fel-1008/make/chrysler would come out with 10.2:1. With the pistons at zero deck and the 1008 head gasket you’d have 10.6:1.