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Old 12-14-2009, 08:11 PM   #1
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Default Push rods

SO I'm look at upgrading my valve train starting with a GT cam and 105# springs. I saw that push rods come in different lengths what is the difference in them I know stock is 7.05. What is the different between oil restricted and not. ( I feel restricting oil is a bad thing) Thanks guys.
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Old 12-14-2009, 08:19 PM   #2
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Oil restricted push rods keep oil in the pan and the lower part of the motor. Restricting oil flow in the pushrods however, allows you to have full pressure and flow at lifters, less wear on the cam and fuller oil pressure.

The longer rods are intended to get full spring collapse (valve open). However; they put lot'* of pressure on the valve train and can cause damage unless you've beefed up the entire train.
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Old 12-14-2009, 08:23 PM   #3
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You will stick with stock length. I would suggest the oil restricted push rods thought. All this does is increases the pressure in the lifters making them firmer. This is the type of PR I run.
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Old 12-14-2009, 08:28 PM   #4
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so no ill effects for the oil restricted. and beefed up train I'm imagining double roller chain
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Old 12-14-2009, 08:35 PM   #5
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If you go with a double roller chain you will need a machined oil pump plate, or use 2 timing cover gaskets. Otherwise the chain will contact the pump cover and break the chain.
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Old 12-14-2009, 08:36 PM   #6
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and that would be the only way to run longer rods. Not going to go with longer ones just from inquiring
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Old 12-15-2009, 02:08 AM   #7
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Quote:
Originally Posted by Nighthwk12 View Post
and that would be the only way to run longer rods. Not going to go with longer ones just from inquiring
The machined oil pump plate or double gaskets are when you got to a double roller. Not longer push rods.
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Old 12-15-2009, 08:41 AM   #8
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Longer pushrods are only used when changes in valvetrain necessitate their need. I have not seen anyone here that would need them except maybe something Pontiac Jeff might do with milling heads etc.

If you deck the heads enough, then pushrod length changes come into play. Certain rockers require different rods and come with them. Stock rockers, need stock length rods if the heads have not been messed with.

Oil restricted rods should only be used where needed. Many have changed ways of thought to not using OR rods with roller rockers due to some failures and premature wear they have experienced. Oil is a lubricant and should be allowed to flow whenever possible. You need to keep oil flow if you stay with stock rockers.

Adding an oil pressure increase kit is well worth the cost. I recommend them for every motor I work on at this level.

Double chain'* have been getting a lot of breakage lately. Do a lot of research before you choose one. It also introduces a ton of vibration into your drivetrain. As an example of how much vibration it makes, I am running a single chain. With Stage 3 heads, 130# springs, S1X cam and 1.8 rockers on top of it all. .579 /.592 lift. Justin..you saw/felt it. Single chain was my choice. In addition the vibration will give your motor mounts a beating.
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Old 12-16-2009, 12:35 AM   #9
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where would I find one of those kits seems like someting else to do if I pull my engine
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Old 12-16-2009, 07:38 AM   #10
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Intense and ZZP both sell them. I've made my own from the gasket ~$2.00 at the dealer and a dorman washer that I picked up at Autozone. I think it was a pack of 10. I remember someing like 060-076 as a part number but could check on that.

The washer goes inside the plunger between the plunger and spring to increase the spring pressure slightly.
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