![]() ![]() If you want to see the difference just take your actual cam lift and multiple it buy 1.6 to get total lift. If you do this you will have no problems with the 1.6 ratio I would not run 1.7 on a sbc I have seen them on dirt track motors it puts a lot of side load on the guide even with correct push rod length. Check the rocker to see if it is riding on the center of the tip of the valve if not change the push rod length to center it and check your piston to valve clearance. There is some things that need to be checked changing ratios make sure the push rod doesn't hit the head where it passes though the head. I bolted a set of the later 1.1 to 1 rockers onto my motor & could definitely feel the difference in the motor. On later VW models they swtched to a 1.1 to 1 ratio. I have done this on cars I bought and felt improvement but just as was stated if you are building the motor, are changing the cam order the cam you want and run the 1.5 ratio. The engine had a big bore kit that increased it from 1200 cc to (IIRC) 1385 cc, and a header. Most of the time the 1.6 is on the exhaust most sbc heads have good intake flow but the exhaust is lower it will help the exhaust flow with the more lift I do think the duration will stay the same but I could be wrong. The 1.6 and 1.5 staggering is used a lot.
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