How much timing?
Hello everyone, I have been reading some post on here and this place seems like a great place for info. I have recently built a 427 sbc with a lil m block, Brodix 11x heads ported by RFD, .630/.630 lift 4/7 swap comp cam with I believe 276/284 duration @50. It has a Proform 950 carburetor with the power valve blocked off and the main jets set at 88 square.
I took my S-10 out this weekend for test and tune and it performed very sluggish and only ran an ET of 6.84. My old 406 would run 6.40's allday long. After a plug check it was evident the motor was running lean, so we jetted the carb up to 94 square, the plugs looked alot better but the ET slowed to 7.00, you could imagine my disappointment! We decided to bump the timing up to 40 degrees and made another pass. The truck left alot harder and ran an ET of 6.63 at 104mph best pass of the day. I plan on sticking a 1050 Dominator on it this week to test, but could this thing actually want that 40 degrees or possibly 42 degrees of total timing? HELP!!