Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 355 SBC Tuning help
View Single Post
  #4 (permalink)  
Old 11-18-2011, 07:38 PM
THE BIG AL's Avatar
THE BIG AL THE BIG AL is offline
SSR Engines & carburation
Last photo:
Join Date: Aug 2011
Location: Newton, NC
Posts: 32
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Going of on a hunch.

With the cam change you need more initial timing.
I estimate you need 18-22 initial. The thumper cams have a low center line with a lot of overlap, this gives the thumper sound. ( I call them whipper cams)

You need a curve kit in dist.

You reduce the amount of mechanical advance to increase your initial based on setting the total timing.

The vacuum advance advances the timing based on vacuum, vacuum is controlled b engine load. The vacuum advance needs to be disconnected during these setting, once the setting are archived, hook the advance back up.

Uploaded with

Red line is total timing, the blue is initial.

On the left is 25 degrees mechanical advance, the right is 16

by reducing the mechanical advance, you raise the initial timing.

Hope this helps
Reply With Quote