i was wondering how much horsepower i would make with the mods in my sig an e-303 ported lower and 69 351w heads with 1.94/1.60 valves and a mild port job. also is there anything i will need to put these heads on?
Using the patented "Mustang 5.0 HP Calculator" which I recently installed on my desktop, youde be making approx 240Fwhp. This numer will vary due to the following:
-Intake temperature
-Fuel quantity
-Octane of gas
-Altitude above sea level
and tons of other chit
Your dropping cylinder pressure as the 69s are 69 CC's !! and the add'l flow WITH the drop in compression will make the engine slow to respond and doggie on the low end!! I put a set of those trick C9s on my 289 in the mid 70s. 1.94/1.60 valves, mild gasket match, changed out a set of ported 289 heads w/stock valves... the loss in compression and low end cost me .3 in the qtr!! I went back to the 54 ccs of the 289s and gaind it back!! They are , however KILLER for forced air!! just a thought!
i was told they were 69's but my dad looked some shiot up for me and told me they have a chamber 1-2 cc's smaller then stock what year would this make them?