An exhaust housing of .63 will need a little bit of a stall for an automatic.
2400 - 2600RPM range.
I have a 12 CM housing, 60-1 wheel on my Syclone 4.3 liter & it would really wake up if I had a converter w/a stall of 2600- 2800.
I ran an 8 CM housing also,it ran great w/the stock 2100 stall converte,but is too small to make good top end power.
I also have a 14 cm housing, but that will need a 2800 stall min to spool up good on a launch scenario.
MBHD
