[copo-2]

69ssZL1 is correct about the 074 heads having 118 cc's, while the L-89 heads (842's) were 106.8 cc's. As he states the 8231 pistons would create a compression ratio of around 9.8 to 1, being able to run on today's premium gas? This I know for fact because I personally have this combination I have tried on a .030 427. This combination was about 10:1 and because of the alum. heads, had no trouble with pre-iginition. The 074 head as stated was designed and used on the L-88 & ZL-1. The 842 heads was used on the 11:1 L-89's, is my personal thought?

This may have been mentioned before, but does anyone have records as to how many 402 L-89's were built in 1970, and what they went into? In previous years, (68 & 69) the L-89 can be documented in their use of Camaro's, Chevelles, & Corvettes? No Novas or Passenger cars in those years as far as any information I have been able to come up with? Many more with the L-89 factory combination was produced in the previous years? I guess there is always a possibility, but why would this have not happened before 1970 and built enough ( 50 ) to set up a class in NHRA Super Stock? Back in those days, NHRA specifications were pretty strict.