351W oil pump drive shaft length

[ScubaSteve]

I am building a 1994 351W to go into my 1986 F150. I am using a DSII distributor and want to be sure I have the correct length oil pump drive shaft. I have read there are two different length oil pump drive shafts but I can not find anything any different length than what I have. When I check Rock Auto it lists a Melling IS83 shaft for the 1980 351W and the 1994 351W with a length of 8.190". I have the distributor and oil pump installed and i can move the shaft up and down some so its not too long but if it was a little longer it would have more engagement in the distributor. Does anyone know if there is actually different length oil pump drive shafts available?

[ScubaSteve]

I think I may have figured out my answer but if anyone has anything to add please do. From what I can find the shaft in the EFI distributor is about 1/2" longer than the DSII distributor but the oil pump drive shaft is the same for both distributors.

[myrl883]

The shafts are different part numbers. Both are obsolete from Ford, and there are no length references in the parts catalog. I can't help ya - sorry!

[ScubaSteve]

Thanks for looking into it for me.

[Jacob84]

The 351w block I have (F4TE) has had a TFI distributor, DSII, and MSD dual sync at different times.They all engaged the stock oil pump shaft positively. Hope that helps

[ScubaSteve]

That does help thanks for the reply.