[djustice]

I recently Rebuildt the engine with a topend kit, my limiting factor for cam choiche was converter stallspeed before the topend rebuild, and not knowing what cam was inside the engine.

After completing the rebuild i now know the exact components in the engine:

Old specs on cam, intake and heads:
6x-8 heads untouched, no sign of portwork.
performer intake (non rpm) no portwork.
Cam; Edelbrock ramair 4 clone: 7157 Performer RPM Hydraulic flat tappet (partially wiped lobe(s)
Specs: Duration @ .050 Intake: 231 degrees - Duration @ .050 Exhaust: 240 degrees - Lift @ Valve Intake: .470" - Lift @ Valve Exhaust: .470" - Lobe Separation: 113.5 Degrees - Intake Centerline: 112 Degrees

With this combo my converter flash stalled to 2400 rpm on the tach when rolling at 10-20 mph and going full throttle.

Based on this info i was adviced to not go larger than 230/[email protected] with a 112LSA to have a nice and well functioning combo for cruising and low speed around town driving, as well as doing a few power pulls now&then.

The new combo:
Edelbrock d-port CNC ported 310+ cfm heads
Hurricane singleplane intake portmatced to heads
hydraulic roller BP comp grind: BP8022SP
Specs: HR) 282/288, 230/236, .510/.521, 112 LS (Std Firing Order/ Std Journals)

Doing the same test on flash stall, rolling at 10-20 mph and going full throttle
now flashes to 3000 rpm.

Armed with the power of hindsigth, i guess i could have gone to a step larger cam: 288/294, 236/242, .521/.540, 112 LS ?

But i had no idea the new topend kit would stretch the flash stallspeed by 600 rpm! with the displacement beeing the same, only 1.3 point in CR ratio higher and a lot more airflow