weim55
Member
Recently picked up a 1971 440 with 346 heads. .040 rebuild with very few miles that after teardown looks absolutely beautiful to bottom. Engine has only one issue I can’t deal with: Low mechanical compression.
I have not cc’d the heads yet but the variety of sources that I have found show it should be close to 90cc. Cast flattops .095 below the deck + .040 fel pros show 8.46 to 1 in the calculator.
Edelbrock performer and Comp XE268
Are the only modifications.
224-230@.050 .477-.480 on 110lsa
The reason compression is so critical is I live at high altitude (6,000-7,000)
Learned a long time ago high compression is absolutely mandatory at this altitude if you want to create decent vacuum and cylinder pressure for snappy off idle torque.
I would like to get some pistons that will put me right at about 10.5. Doing research I don’t think a flattop will get me there even at zero deck. I did not dig any further to see if there’s a small dome I should be looking for for the 440.
Thoughts?
Steve weim55 Colorado
I have not cc’d the heads yet but the variety of sources that I have found show it should be close to 90cc. Cast flattops .095 below the deck + .040 fel pros show 8.46 to 1 in the calculator.
Edelbrock performer and Comp XE268
Are the only modifications.
224-230@.050 .477-.480 on 110lsa
The reason compression is so critical is I live at high altitude (6,000-7,000)
Learned a long time ago high compression is absolutely mandatory at this altitude if you want to create decent vacuum and cylinder pressure for snappy off idle torque.
I would like to get some pistons that will put me right at about 10.5. Doing research I don’t think a flattop will get me there even at zero deck. I did not dig any further to see if there’s a small dome I should be looking for for the 440.
Thoughts?
Steve weim55 Colorado
