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FE Power Forums => FE Technical Forum => Topic started by: 390thunderbirdspecial on July 03, 2026, 07:28:51 AM

Title: 406 Heads
Post by: 390thunderbirdspecial on July 03, 2026, 07:28:51 AM

I bought a 390 bored 60 over with many hi-grade performance parts that I want to put in my 64 Galaxie. One of the components were a matching pair of 406 heads, c2se 6090c. They have been ported and go with my f427 intake. The heads have adjustable rockers and heavy duty valve spring and cups. I believe these to be original 406 heads in excellent shape. I am wondering what kind of compression rating I would be looking at. I have hydraulic roller cam and lifters as well.

This is my first FE build so I'm a bit new with this.

Thanks

Title: Re: 406 Heads
Post by: 1964Fastback on July 03, 2026, 10:03:26 AM

MustangTek claims those heads are 64 cc but since they are on the shelf and especially since they have been worked on, I would cc at least one chamber per head.  Cheap and easy.  You can then plug all the specifics into an online CR calculator (e.g. Wallace Racing) and see where you fall.

Pat

https://www.mustangtek.com/heads/Heads.html

Title: Re: 406 Heads
Post by: frnkeore on July 03, 2026, 11:23:53 AM

We'll need more info on deck clearance, how many cc on the piston dish and actual head cc for a actual CR but, if the 406 heads have 64cc and your C1's have 74cc, then that should raise the CR almost 1 full point.

Title: Re: 406 Heads
Post by: 390thunderbirdspecial on July 03, 2026, 11:28:05 AM

Thank you, I will and get some more info.