I thought after you had your motor off the dyno you discovered something that was the likely cause of the lower than expected power?
The top end of the run on the last sheet from the OP had the bsfc numbers in the .7 range.
In 32 years, I don’t think I’ve ever seen them that bad....... not without a plug wire off or something like that.
Poor bsfc numbers are simply the result of using a lot of fuel....... and not efficiently converting it to hp.
Edit- just read thru mbairds old dyno thread.
His engine was overfilled with oil by 2.75qts....... which I have personally seen cause big power losses.
