Big Block Pushrods and Lifters

[Polara426]

On a stock build 426 wedge motor can I use 68 and up lifters and pushrods on a cam change.Later big blocks use a shorter pushrod and lifter but if I use them together this should work seems there is no difference in the blocks is this correct has anyone else done this.1966 and 67 440 also used the early pushrods and lifters.

 

[kidmopar]

ive used 68 up stuff on a 67 block, i did not know they were shorter those years of 66, 67 thats new to me, i thought they were all the same stock except for length in rb and b motors.

 

[67 B-body]

The lifter seat height is in fact one of the items that dictates the pushrod length. I just ran into this scenario with my build.... The Hughes EDM solid lifter is a different height than the Mopar Performance solid lifter. This means you have to use a different pushrod length to match things up and correct rocker / valve geometry. The year of the block had no bearing on this dimension at all.... just the differance in manufactured parts.

 

[67 B-body]

BTW,,, I still have the NIB Mopar Performance solid lifters if anyone is looking...

 

[arizona satellite]

I believe the only difference is in the solid or hyd lifter, the parts books do list different part numbers for solid or hyd pushrods. the block and heads are interchangeable on all RB motors.

 

[67 B-body]

Well, the part number for pushrods would be different simply because they are nothing alike.
The solid lifter with adj rockers uses a ball and cup pushrod, and the hyd lifter uses a straight ball pushrod end only.
You'll also find that comp cams offers a couple different solid lifters for the same application. Look into this and you'll find the lifters have a different cup seat height. I haven't looked into the dimensions between different hyd lifters, but I imagine you'll find the same thing.

 

[Meep-Meep]

The 426W and 440 blocks are the same as far as the push rods go. Just follow the recommendations above to make sure your geometry winds up correct.

 

[Polara426]

Thanks for all the replies I believe everyone agrees if I match components and check geometry I should be ok.Most commented on solid lifters but this is a hydraulic and the parts books list different pushrods and lifters for pre 68 big blocks.I did run into a problem with running the late lifters with early pushrods and had some valves stay open because of less plunger depth on late model lifters ( sealed power and summit #ht2011 early lifters are ht812 just wanted to see if any else ever had this issue.