Pushrod length!!!
#1
Pushrod length!!!
This is an FYI for you guys building a small block, especially a roller engine, or a 65 with #2 heads.
All of us know that the BBO engines have 3 different pushrod lengths available, I did a quick check of what I had in my garage, and found 3 different Small block pushrod lengths, also.
Here goes...
Roller cam engines have a 7 11/16" (or so) length. Mine came from a DX engine. This is due to the longer .921 lifter.
64, 66-76 engines have a 8 1/4" pushrod length. I did not find a difference between the large, and small tip. You do need to run the correct rocker arm for the tip size of your pushrod, however. I would not want to mix these up either.
1965 engines have a 8 3/8" long pushrod, due to the slightly different valve gear, I imagine.
I did not have any 307 units to check.
If you have a mix of these parts, make sure to label them so you do not mix them up!!!
Jim
All of us know that the BBO engines have 3 different pushrod lengths available, I did a quick check of what I had in my garage, and found 3 different Small block pushrod lengths, also.
Here goes...
Roller cam engines have a 7 11/16" (or so) length. Mine came from a DX engine. This is due to the longer .921 lifter.
64, 66-76 engines have a 8 1/4" pushrod length. I did not find a difference between the large, and small tip. You do need to run the correct rocker arm for the tip size of your pushrod, however. I would not want to mix these up either.
1965 engines have a 8 3/8" long pushrod, due to the slightly different valve gear, I imagine.
I did not have any 307 units to check.
If you have a mix of these parts, make sure to label them so you do not mix them up!!!
Jim
Last edited by Warhead; June 16th, 2010 at 08:59 PM.
#2
On the subject of pushrods, why do some sources show 8.234" pushrods for the SBO? And why are there two different part numbers at Supercars Unlimited for a 64 330 with rocker shaft (same p/n as 68-69 350) and 65-67 330 pedestal? I assume their third part number for the 67 4 bbl is the 39 degree engine.
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