93 5.0 bent pushrods

[AIFOX]

Just swapped out the heads on my 93 for some GT40P's, fully rebuilt with slight port work and comp springs good for .590 lift. I used Crane 1.7 RR's with stock FRPP pushrods and brand new lifters from FRPP. I got everything back together went to start the car and it immediately didnt sound right. Shut it down and started going back over everything. I found that ALL my pushrods are bent. 2 of them actually came apart. Any ideas on what I could be dealing with? Springs too heavy? Pushrods incorrect length? Lifters seized?

[red95gts]

Cam?

Sounds like all the valves kissed the pistons or the valve springs bound....

[AIFOX]

B cam

[red95gts]

Pedestal rockers? Adjusted correctly? Did you check piston to valve clearance?

[sickpony]

too much spring?

[Vertnut]

A B with 1.7's should typically work, but not with a ton of clearance. I wonder if the heads were milled when they did the other work?

[91CoupeMike]

How much are the heads milled?

Always!!!!!! Do a piston to valve clearance test.

[91CoupeMike]

Also. Did you alter the cam timing?

[AIFOX]

A B with 1.7's should typically work, but not with a ton of clearance. I wonder if the heads were milled when they did the other work?

I am wondering that myself, I was told they were not but who knows. I ran this exact same setup about 2 years ago and it worked perfect. Only difference was I was running stock springs.

[AIFOX]

Also. Did you alter the cam timing?

No the cam was already in the car, all that was touched was the heads.

[AIFOX]

too much spring?

Im starting to suspect that.

[BlueCoupeRedVert]

Also. Did you alter the cam timing?

That's what I am thinking...

[AIFOX]

Found the issue. Springs are binding up. Thanks for the help guys

[jyro]

you can't check things like that enough before you crank a motor

Found the issue. Springs are binding up. Thanks for the help guys

you can break a lifter, bend valves, break pistons, break a timing chain, all kinds of bad things that affect performance through the life of that motor build. The sealing of the valve seats to valves is one of the most important performance items in the motor. There are many thing inside a motor that affect performance, without a leakdown test, you'll never figure out why the motor is down on power because of a slightly bent valve.