Pushrod help

stevewarden0

New Member
Mar 7, 2020
1
0
1
62
Ontario
Hi, I have a 66 289 that I am rebuilding, I have put a pair of 85 mustang heads on the block and the pushrods are toooo short.
It is a solid lifter cam and standard followers the pushrods are from the 66.
does anybody have any what pushrods I should use?

Thanks
Steve
 
  • Sponsors(?)


Saberdemon

Active Member
Mar 12, 2020
83
30
28
Maryland
Hold on bud. You can’t just pick a longer pushrod and slap it on. Get yourself a pushrod checker and do it the right way. There is a reason we take the time to get the correct length pushrods for our motors. Do a couple searches on valve train geometry and it’s importance. Then if that’s not enough, do some searches for photos of when your valve train geometry being wrong causes a catastrophic failure. It’s cheaper to do it right the first time around.
But that’s just my two cents.
 

Realmongo

I prefer to be called "Evil Genius"
Founding Member
Oct 10, 2001
2,295
34
99
Western Mass
That is what Speed-Pro made that part number pushrod for, 289/302 with flat tappet cam and the later style head and rocker arm.
No guess work needed.
 

Saberdemon

Active Member
Mar 12, 2020
83
30
28
Maryland
So what takes into account head gasket thickness, valve tip wear, or wear on the cam lobes? I get that companies always have their “answer” for things, but it’s not that hard to measure first.
still just my two cents.
 

Realmongo

I prefer to be called "Evil Genius"
Founding Member
Oct 10, 2001
2,295
34
99
Western Mass
If you find the cost of the Speed-Pro part prohibitive, another push rod worth looking at is the Sealed Power RP-3167 for the stock 1984 HO 5.0 Mustang.
Its length is 6.8760" if that works out for you.