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Author Topic:   1.5 or 1.6 Rockers
69-er
Member
posted May 22, 2001 07:00 PM
I'm considering getting some Harland Sharp roller rockers in 1.5 (8ea) and 1.6 (8ea) ratios.

At the risk of over simplification, which ratio would work better for the intake and which ratio for the exhaust?

Here's my spec's:

355 SBC,
12:1 CR,
462 heads, 2.02 & 1.60, pocket ported, mild runner porting
.540" lift 258 dur. I,(.050"), .558" lift 266
dur. E,(.050"),
Holley 2 barrel,
1 5/8" headers.

Also, are Harland's a good brand?

Thanks!

Larry

[This message has been edited by 69-er (edited May 22, 2001).]

jammin
Administrator
posted May 22, 2001 07:13 PM
The main thing that the upper ratio rockers do is open the valve sooner. With 1.6 on intake and 1.5 on exhaust, your engine will open the intake faster and close the exhaust slower, which will build cylinder pressure. You can get too much of it. The setup really has to work hand in hand with the camshaft. If you want some really great help with this, call CamCraft Cams....one of our sponsors(look for the banner above, or on the sponsors page). They can help you a lot with this. They really know their stuff!


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