Need to buy new push rods, I need to know the standard length of an '87 chevy 350 small block?


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'87 L98 TPI IROCZ, AFR190 heads, 3.70 gears, ZZ9 cam, 3000 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, no MAF screens, Accel manifold base & SuperRam, 24#/hr SVO injectors, Edelbrock double roller timing chain, MSD ext coil & distributor, trans cooler, 52mm TB with airfoil, TB coolant bypass, AFPR(50psi), K&N filters, Hotchkis lowering springs, my custom chip, Lay Ind. ram air kit, SS Brakes 1LE upgrade 12" rotors dual piston calipers, 265/45R16 Kumho V700 tires.
ET 13.27sec @ 103mph on MT ET Streets
'90 Eagle Talon AWD, no rust thru 9 winters
'99 Camaro SS, red, 6-spd, T-tops, Mcleod clutch, Pro 5.0 shifter, MAF processor, Direct Flow airlid, K&N filter, next mod: 4.10 rear gears
313.7Hp & 320.6ft-lbf, ET 13.55sec @ 105.1mph

 

best thing to do is get a length checker and make sure you need the standard length.
Especially if you have done anyblock decking.

But, for a flat-tappet lifter, 7.8 inch.

For a factory hyd-roller lifter 7.2 inch

 

Thanks jcb,

What happened was that I was looking for a miss in the engine, the car felt like it was running on 7 cylinders.

So after going thru the ignition stuff, I decided to pull off the valve covers and check for a broken spring.

Well what I found was that on cylinder #2, the rocker stud on the exhaust side was broken off and the push rod on the intake side was broken in half. So cylinder #2 was totally dead.

This is the second rocker stud that has broken on my AFR heads. These studs came from AFR when I bought the heads. The first stud broke after only 1 month. I thought that it was just a fluke. After this second one broke, I'm going to replace all of the rocker studs.

One would think that if you spend $1500 on a set of heads that you would get good studs!
I'm really pissed off!!!!!

 

THe usual reason for stud breakage is valve spring coil bind, or over-revving the springs; the results are similar in both cases, namely the studs get several times their design load applied to them... the effect is much like beating on them with a hammer, as much as hundreds of times a second.

What is your valve train? The answer to your problem lies there, not the studs; the studs are just the victim of whatever is actually going on.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Well, the heads are AFR 190 heads and I ordered them preassemble for max valve lift of 0.600", at least thats what I was told by AFR what I was going to get.

I have a ZZ9 cam and 1.5 ratio rocker arms so that the actual max valve lift is about 0.52".

I have never checked for coil binding. I believe that when the valve is fully opened thats when you measure the gap between the individual coils of the valve spring. Is this correct?

What is the minimum gap between the coils at max lift?

BTW, the rockers are 1.5 ratio Comp Cams roller tip rockers and also I am using guide plates which came with the heads.