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post #1 of 8 (permalink) Old 02-07-06, 12:20 AM Thread Starter
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1.8 ratio rockers

Has anyone used 1.8 ratio roller rockers in a cleveland?If so what brand and what effect did it have on the geometery of the valve train ie pushrod lengths.Seems like an easy way to give a bit of extra lift without changing cams...Valve float could be worse but.

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post #2 of 8 (permalink) Old 02-07-06, 02:31 AM
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Re: 1.8 ratio rockers

i know a guy who runs a set he had a big cam and kept bending pushrods now with medium roller cam its okay
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post #3 of 8 (permalink) Old 02-07-06, 06:04 PM
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Re: 1.8 ratio rockers

I am running Harlan Sharp Big Block Chevy 1.8 ratio Aluminum Roller Rockers On my 408C.
Also I had to use pushrods that were .100 shorter, because the pushrod was touching the back of the rocker arm at full lift.

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post #4 of 8 (permalink) Old 02-07-06, 06:34 PM
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Re: 1.8 ratio rockers

Quote:
Originally Posted by TMG70GT
I am running Harlan Sharp Big Block Chevy 1.8 ratio Aluminum Roller Rockers On my 408C.
Also I had to use pushrods that were .100 shorter, because the pushrod was touching the back of the rocker arm at full lift.
How is the geometry now? Does the roller run nice on the valve tip?
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post #5 of 8 (permalink) Old 02-08-06, 04:28 PM
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Re: 1.8 ratio rockers

yes they have a nice centerd pattern on the valve tip, that was another reason that I had to run shorter pushrods. tim

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post #6 of 8 (permalink) Old 02-08-06, 10:24 PM Thread Starter
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Re: 1.8 ratio rockers

Quote:
Originally Posted by TMG70GT
I am running Harlan Sharp Big Block Chevy 1.8 ratio Aluminum Roller Rockers On my 408C.
Also I had to use pushrods that were .100 shorter, because the pushrod was touching the back of the rocker arm at full lift.
Thats interesting...What is the difference between the two?There both canted valve so I knew they would be similar.What lift has your cam got at the lobe?and are they 7/16 studs they're mounted on?cheers.
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post #7 of 8 (permalink) Old 02-12-06, 12:53 PM
1970 Torino GT 408C
 
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Re: 1.8 ratio rockers

The 1.8 for the chevy are more readly available and at a lower price.
Yes I have 7/16 screw in studs with 5/16 push rods.
I have .387 Lobe lift on the In. and .371 on the ex.

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post #8 of 8 (permalink) Old 02-12-06, 04:16 PM
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Re: 1.8 ratio rockers

Here is a pic of the difference in the rocker arms.
Attached Images
File Type: jpg rockercomparo.jpg (120.9 KB, 53 views)

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