LT4 383 LT4 build question, compression....

[Bluewasp]

GUys,

I'm trying to decide on the compression ratio for my 383 build. Choices from the builder are 10.4, 11.2 and 11.8... 11.8 is to high for sure but I can't decide between the 10.4 and the 11.2 There is a .8 difference which would give me about 15 to 20HP (flywheel) by going with the 11.2 over the 10.4. CAM is the GM847 with CNC LT4 heads.



thanks
robert

 

[-=Jeff=-]

Tough call on the Compression. I would almost suggest the 10.4 compression for the street, but then the ZR1 was close to 11:1

 

[Bluewasp]

Tough call on the Compression. I would almost suggest the 10.4 compression for the street, but then the ZR1 was close to 11:1

Stock LT4 compression is 10.8:1.... the builder is strongly suggesting the 10.4...

This motor should produce 500 to 525hp (peak) with 10.4:1 and about 540 to 550hp with the 11.2:1

For each point increase in compression you gain about 3% HP.

Hard choice...

 

[*89x2*]

who is building this???