Head help? Need fast answer.

[tekslk]

I just looked at some J heads with this number, what does it mean, 3418915 F

 

[4404spd]

Its the casting number.

 

[OldmanRick]

I just looked at some J heads with this number, what does it mean, 3418915 F

Hi Tom, if the're unmodified, they should be 1.88/1.60 valves and have a combustion chamber around 72cc's. You may have these on your 360 already?

 

[tekslk]

He said there 202s but I guess I will have to measure. What is the f and what year are they? Mine are 1973 360 heads with 188s.

 

[lil red]

mopar engines states 1971 360 or 72 340/360 (or T/A but unlikely)

 

[OldmanRick]

He said there 202s but I guess I will have to measure. What is the f and what year are they? Mine are 1973 360 heads with 188s.

Sorry, if they were early "J"s they could have 2.02's. I'm trying to find if the F has any significants as to the year produced.......

 

[paulscars]

I just looked at some J heads with this number, what does it mean, 3418915 F

according to my book these heads could be from a 1970 340 6 bbl or a 1972 340. also a 1971 360 and 1972 360. the combustion chamber volumes differed a little. at least according to my mopar bible.

 

[tekslk]

Thanks everyone I will check them friday.

 

[OldmanRick]

Haven't found what the "F" meant. Consensus on the net seems to be that the 71' 340 2.02's had a chamber in the 68/72 range? idk.

 

[1968FormulaS340]

F is most likely just a mold designation or mold revision. Meaning...... It essentially means nothing.

 

[1wild&crazyguy]

The 915F jheads i have were off a 1971 360.
Those r the heads i used to port into the 280's for my stroker.

I dont think they are anything special compared to any other 915's..but idk

 

[tekslk]

The F stands for forged I read it on the net, Will better flow help with a ping issue?

 

[OldmanRick]

No offense to Wild & Crazy, but Shady Dell, "Ryan" is right in your backyard. Have you talked to them about what you want and your budget?

 

[fishy68]

The F stands for forged I read it on the net, Will better flow help with a ping issue?

Sorry but the F does not stand for forged. No mopar head was ever forged. All are cast. Totally different process. I can't say what the F stood for but every set of 915's I've had ended in F.

No, flow won't affect a ping issue.

 

[1wild&crazyguy]

8-)

No offense to Wild & Crazy, but Shady Dell, "Ryan" is right in your backyard. Have you talked to them about what you want and your budget?

none taken ;)
Besides, he gets how much outta these heads? 8-)