'The 383' ~ Getting Those True Factory Horsepower Ratings
Paul,
On ANY stock 68-71 383 or 440 Magnum, set the total timing at 38 degrees. Huge difference!
Here's my '68 383/727 Roadrunner bought used in 1971
3.91 Sure Grip
Sig Erson SH130 cam (can't find the specs anymore but I believe was a .484)
Doug's headers
Edelbrock DP4B (Big difference)
Mallory 4-lobe distributor
Accel coil & wires
Holley 800 DP not as good as hot-rodded 625 AVS with enlarged secondary jets
and completely removed air valve secondary door
Pictures before and after:
Paul,
On ANY stock 68-71 383 or 440 Magnum, set the total timing at 38 degrees. Huge difference!
Here's my '68 383/727 Roadrunner bought used in 1971
3.91 Sure Grip
Sig Erson SH130 cam (can't find the specs anymore but I believe was a .484)
Doug's headers
Edelbrock DP4B (Big difference)
Mallory 4-lobe distributor
Accel coil & wires
Holley 800 DP not as good as hot-rodded 625 AVS with enlarged secondary jets
and completely removed air valve secondary door
Pictures before and after: