UPDATE
Thought I'd add latest change and dyno results to this thread. Sorry couldn't edit my previous post.
Baseline:
Stock '73 350 (2v factory rated @ 150hp)
'73 #46 heads 96cc (after pulling these, I found 2 burned exhaust valves)
Stock 555 Cam
Performer intake and Edelbrock 850 cfm
2" dual exhaust through a set of glasspacks, stock log manifolds.
Swapped cam:
performer cam 204/214 .420/.440 110 LSA.
Timing @ 12* ini and 38* total
Swapped heads and carb:
'70 #16 small valve heads, shaved to 68cc.
SCR appx 9.9:1
Compression test appx 190 psi on all cylinders.
Timing @ 6* ini and 32*total to prevent detonation.
Change the carb to Edelbrock 650 cfm (lean ~14.1:1 afr @ WOT)
Swapped carb:
Back to Edelbrock 850 (Rich ~12.0:1 afr @ WOT)
Dyno results baseline, after cam, and after heads and carb swaps:
274 RWTQ @ 3100 rpm; 196 RWHP @ 4200 rpm -- baseline
274 RWTQ @ 3450 rpm; 205 RWHP @ 4600 rpm -- cam swap 850 carb
293 RWTQ @ 3300 rpm; 228 RWHP @ 4750 rpm -- head/carb swap to 650
308 RWTQ @ 3400 rpm; 247 RWHP @ 4800 rpm -- carb swap back to 850
Torque curve was nearly flat with 295+ from 2000 to 4300 rpm after swapping back to 850 carb. Next change will be exhaust, then perhaps go to Q-Jet or another cam swap.
|