F.5 head on 2F engine (2 Viewers)

[BullHab]

Good question. I was so excited that I forgot to look at the gauge.

All good.

 

[BullHab]

As I understand, a domed piston with an open ( .5 head from 1974) configuration has higher compression than a flat piston with a closed configuration. Probably a domed piston will not work with a close configuration.
Do you already have the closed head? If so, you can measure the diameter.

Really appreciate it. It appears to me that the 74 head is kind of a crosd between open and semi closed chamber.

 

[BullHab]

I took her on the freeway for the first time today, going 75 mph. She sounds like she could go a little faster, but the 55 mph speed limit is stopping me from pushing her further. She also has 7.00x15 tires, which make for a bit of a bumpy ride.

Surprised at the stock compression numbers. Compression makes power!! Thank you for shating.

 

[BullHab]

Surprised at the stock compression numbers. Compression makes power!! Thank you for shating.

Sharing!!!!

 

[SergP]

Surprised at the stock compression numbers. Compression makes power!! Thank you for shating.

stock compression is 135-160 (dry) with f.5 head compression from 170 (dry) and higher..

 

[BullHab]

stock compression is 135-160 (dry) with f.5 head compression from 170 (dry) and higher..

Looks like I need to find a 74 60051 head! I am trying to contact the previous owner of my FJ40 to determine how much, if any, was shaved of the head during rebuild about 30k miles ago.