Originally posted by erik erikson
IMO,for what it is worth the dwell time at TDC with the longer rod becomes more important with a larger port volume, higher comp. ratio and a blower,turbo,n20 also better piston skirt wear better ring seal,better ring life and cylinder bore wear.Here are some specs. on the heads I have built.I look more at the mid-lift numbere because the valve spends more time in this area then at max. lift of low lift numbers. These numbers are taken at 28 inches of water using a 2.055 valve with a under cut stem.The exhaust is 1.6 in dia. with a under cut on the stem. .200 lift 149 in./ 122 ex. .300 lift 209 in./ 159 ex. .400 lift /262 in./ 190 ex. .500 lift 290 in./ 224 ex. .600 lift 307/ 234 ex. .700 lift 316 in./ 242 ex.Sorry this is hard to read.
Wow, some great numbers!!!!! Were these on Dart heads or ???? Only other criteria is that for weight reasons I would prefer aluminum...the Edelbrock/Chapman heads also have a 5/8" thick deck...... just so we are comparing apples to apples.....