Guest Posted June 20, 2003 Share Posted June 20, 2003 What parts are diff. on a 1970 455 from a '72 455 that make all that extra horsepower and what can I do to my '72 to give it more balls because right now my electra just isnt cutting it. <img src="http://www.aaca.org/ubbthreads/images/graemlins/confused.gif" alt="" /> Link to comment Share on other sites More sharing options...
The Old Guy Posted June 21, 2003 Share Posted June 21, 2003 There are two major differences.The first is compression. The 70 has 10.25 to 1 an the 72 has 81/2 to 1. The major change was the way they were rated. The 70 was a bare engine( driving no power accessories and headers instead of manifolds). They also ran the 72 with retarded timing to make them pass emissions Link to comment Share on other sites More sharing options...
Turbo Loyd Posted June 21, 2003 Share Posted June 21, 2003 [color:"blue"]According to the NHRA website:http://www.nhra.com/tech_specs/engine/index.htmlThe 70 engine had 16cc dished pistons and the 72 engine had 28cc dished pistons, both heads had 59cc of volume except the 70 stage 1 had 55 cc.As Old Guys says the gross versus net evaluation method made all the HP figures look pitiful. Link to comment Share on other sites More sharing options...
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