'The 383' ~ Getting Those True Factory Horsepower Ratings
John,
I agree .......... 35* Total Advance is just not enough.
On The Sig Erson SH-130
There are a couple of 'old specs out there.
> .440" Lift ~ 310* Duration
> .472" Lift ~ 310* Duration
> .493" Lift ~ 310* Duration
The 'new' TQ-30-H
> .462" Lift ~ 310* Duration {226* @ .050"} ~ 52* Overlap ~ 111* CL
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:
John,
I agree .......... 35* Total Advance is just not enough.
On The Sig Erson SH-130
There are a couple of 'old specs out there.
> .440" Lift ~ 310* Duration
> .472" Lift ~ 310* Duration
> .493" Lift ~ 310* Duration
The 'new' TQ-30-H
> .462" Lift ~ 310* Duration {226* @ .050"} ~ 52* Overlap ~ 111* CL