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| | | | Joined: Mar 2011 Posts: 58 New Guy | | New Guy Joined: Mar 2011 Posts: 58 | The 302 I am building is coming along great. Until I decided to do as Pop's wanted and use 1.75 ratio rocker arms from a buick I8. They are a good shaft rocker, stamped steel and in great condition despite the fact that they are older than me.
The 302 head has pretty vertical geometry and the rockers are just not going to work. Are there other mfg's of I6 rocker assemblies? or am I stuck with stock?
Getting more humble every day | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | Can you address the rocker arm problem by changing the height of the rocker shaft by extending or shortening the stands that hold it off the head? It might require custom-length pushrods if you do that, however. What's the stock rocker ratio, and how much extra valve lift do you anticipate getting? On some of the small block Chevy V-8's I've built, changing the rocker ratio actually resulted in a horsepower loss on the dyno unless a massive amount of geometry correction was done, moving rocker stud position, etc.
Jerry
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| | | | | Joined: Mar 2011 Posts: 58 New Guy | | New Guy Joined: Mar 2011 Posts: 58 | Jerry,
Exactly. I can change all of those things, but the 1.75 rocker will either miss the valve at full open or the push rod at full close. The Buick push rods are easy enough to shorten. They have caps top and bottom. The trunion lenth seems to be the real issue. If I move the rocker shaft stands, the rocker will hit the valve perfectly and open and close. But the pushrod geometry will be all messed up. I'm considerin roller lifters of the 1.6 flavor. The cam is already ground so I have to work with 218@ 050 and .300 lobe. I will be a very fun ride no matter how I solve it right???? | | |
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