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I think some books state the 71's at 10.0 and the 70's at 10.5 comp ? I also dont remember if it was 71 or 72 when they started putting EGR jets in the bottom of the intake manifold ? Ron

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I beleive the 1973 Thermoquad intakes where the first SB 4 barrel intakes to have the EGR jets in them The NHRA blueprint speces for the 1968 to 1971 340 4 barrel motors are the same on all the specs. I use to help and consult with one of the more successful NHRA Mopar SB racers in SO CA., he could swap the intake and carbs. on his Challenger and add weight so he could run 6 different NHRA stock clases,(C/SA through G/SA) with the same long block and still be legal