I thought id start a new thread.


77 f250 351m 4spd 4x4 is getting a new engine, stock 69 429 2bbl (with 4bbl intake) I want to get away from the points, I will buy a new stock distributer out of a later 460 and recurve it to my likings. i need to know what my likings should be.


the engine will be stock. it is not a race truck and I do alot of towing. i will run 91 octain.


i need to know:

initial timing.
total advance.
at what rpm the advance is all in at.





-gbm-

 

Intial timing will depend on the advance curve you choose.

Total advance should be in the 36° to 38° (more than 38° is asking for trouble)

RPM for total advance depends on vehicle weight, gearing and what you are planning on doing with the truck. Towing will require higher rpm than a light truck with a 4.10 rearend. General recommendation is 3000 rpm for light truck and normal driving. While 3500 rpm for heavy truck and/or towing.

You did not ask about what curve to choose. I'm a believer in a shorter curve is better. A 10° dist. = 20° engine damper is better than an 18° dist. = 36° damper.

Example (My 1984 F250 Super Duty, Super Cab 460 with a reworked 1850 Holley, C-6 and 4.10 rearend, stock tires)

13° dist. = 26° damper.

36° max timimg in at 3500 rpm.

Makes for a 10° intial.

 

Yes I understand the concept, my terminolgy is just off I have never recurved a distributer.

of course 10 deg. advance on the dist. will be 20 deg. on the balancer as the cam and distributer spin half as fast as the crank (4 stroke engine basics)


these were the numbers i was looking for and i thank you.


-gbm-