pushrod purchase
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Senior User
Joined: Mar 2008
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pushrod purchase
im trying to determin what size pushrod fits my 390 engine. the rockers are non adjustable. ive measured with a caliper and and most seem in the 9,590 range but also have a few at 9.595 and even two at 9.588. napa said the norm was 9.620. what do i buy? 9.590 or 9.620?
Rabbit-Hole Researcher
Joined: Feb 2004
Posts: 466
Likes: 6
From: Middle of Ohio
Please look into this topic in the old posts. You can have some real trouble if you skip this important rebuild topic. Hydraulic lifters only have a little bit of travel.
There are at least six "stock" lengths. You really need to measure the new length with a screw-apart-push-rod tool. They are less than $25 bucks. Your head gasket, block cleanup, and new lifters change the dimension, in addition to what 'Mike 68" said.
If the dimension comes out to something strange, check out the posts on "Pedestal Shim" and that may give you other options or combinations.
If the existing pushrods are different lengths, there is a chance they are bent. I had two that were bent, and they were about .010 shorter than the rest, and I couldn't tell. My machinist noticed what I couldn't.
Pushrods are inexpensive. I'd replace them to get them all the same. If you didn't have the valve stem heights equalized, or if they are well-used, I suppose it doesn't matter much, but it would be one less unknown.
There are at least six "stock" lengths. You really need to measure the new length with a screw-apart-push-rod tool. They are less than $25 bucks. Your head gasket, block cleanup, and new lifters change the dimension, in addition to what 'Mike 68" said.
If the dimension comes out to something strange, check out the posts on "Pedestal Shim" and that may give you other options or combinations.
If the existing pushrods are different lengths, there is a chance they are bent. I had two that were bent, and they were about .010 shorter than the rest, and I couldn't tell. My machinist noticed what I couldn't.
Pushrods are inexpensive. I'd replace them to get them all the same. If you didn't have the valve stem heights equalized, or if they are well-used, I suppose it doesn't matter much, but it would be one less unknown.
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