351W / 408 Timing
Posted: 2021 Sep 11, 16:45
Car / Engine profile: 1970 Ford Mustang - 351W stroked to 408 by Carolina Machine Engines (CMEngines dot com) - RHS heads (64cc chamber / 180cc intake runner) - Edlebrock RPM Performer intake - Quick Fuel SS-VS-780 carb - Cam 270deg duration / 230 @ 0.05 lift / 110 lobe - MSD Pro Billet & 6AL Plus ignition & Blaster II coil - BBK headers with dual exhaust and X pipe
She stand dyno'd 440hp/470ft-lbs around 4700rpm (need to go break out the dyno sheet to confirm)
Was reading a page on Ignition & Timing http://www.efidynotuning.com/saftot.htm that had a MBT reference page http://www.efidynotuning.com/mbt.htm posted in 2013 / last updated in 2018
Not sure what the last two number mean (N/A and Cruise)?
MAKE CID LITERS CONFIG CYLINDER HEAD MAKE/MODEL/SPEC Boosted N/A CRUISE
FORD 302 / 351w 5.0 / 5.8 SB v8 RHS NO 22 39
Does this mean 22deg initial advance and 39deg max advance?
I've been running 14/35 (blue 21deg bushing with 1 silver & 1 blue spring = centrifugal starts at 1300rpm and maxes at 2800rpm)
I'll say that at idle - 900rpm - vacuum goes up as I increase advance all the way up to 20deg - which is scary given the cam would let it go to 45deg total advance with the cam I have in there.
I've read a not of sites that say SBFs can only handle up to 35deg advance - although not sure what that even means - "handle" to me means the bottom end max torque and there are a lot of 700hp/600+torque SBF out there.
Please clarify the 22 & 39 numbers and any advice would be greatly appreciated.
She stand dyno'd 440hp/470ft-lbs around 4700rpm (need to go break out the dyno sheet to confirm)
Was reading a page on Ignition & Timing http://www.efidynotuning.com/saftot.htm that had a MBT reference page http://www.efidynotuning.com/mbt.htm posted in 2013 / last updated in 2018
Not sure what the last two number mean (N/A and Cruise)?
MAKE CID LITERS CONFIG CYLINDER HEAD MAKE/MODEL/SPEC Boosted N/A CRUISE
FORD 302 / 351w 5.0 / 5.8 SB v8 RHS NO 22 39
Does this mean 22deg initial advance and 39deg max advance?
I've been running 14/35 (blue 21deg bushing with 1 silver & 1 blue spring = centrifugal starts at 1300rpm and maxes at 2800rpm)
I'll say that at idle - 900rpm - vacuum goes up as I increase advance all the way up to 20deg - which is scary given the cam would let it go to 45deg total advance with the cam I have in there.
I've read a not of sites that say SBFs can only handle up to 35deg advance - although not sure what that even means - "handle" to me means the bottom end max torque and there are a lot of 700hp/600+torque SBF out there.
Please clarify the 22 & 39 numbers and any advice would be greatly appreciated.