Weiand cheater heads alu

[jimTN]

60's for sportsman class dirt track cars. I do not know why they were allowed and fins not. Around here it was common to see heads that had the fins broken and ground off. The advantage of the cheater heads was a gain of compression.
Local rules allowed 60 over bore, 4" stroke any cam except rollers, one two barrel, no v12 igns,