In 1981 John Hagen and Charlie Malyuke were running destroked "baby Hemis" based on low deck big blocks to be more competitive under NHRA's lb/cubic inch Pro Stock rules. It was basically a 383/400 with the block heavily modified to accept the Hemi heads. Hagen set a MPH record and I believe got R/U at the NHRA World Finals in 1981. Considering the short development time, it would have been a very competitive combo if the rules hadn't been changed for 1982 to 500" limits for all brands.
