Stroker rebuild

Carl · Post by **Carl** » Wed Sep 17, 14 1:15 pm

Prior to setting number 1 up with an inlet and exhaust valve etc. I marked the top of the valve stem so I can see how the roller rolls across the top of the stem this tells me if I have the correct length push rod. If the mark is too close to the exhaust side, the push rod is too long, too close to the inlet and the push rod is too short, you want it as close to the centre as possible. This as close as I could get it without running out of adjuster thread. You need an adjustable push rod to get the correct length

Carl · Post by **Carl** » Wed Sep 17, 14 1:22 pm

And all bolted on, it just so happened with the cam that's gone in a set of 273 pushrods where the perfect length.

Carl · Post by **Carl** » Wed Sep 17, 14 1:24 pm

The lifters got a good coating of bearing guard before going in too

Dave-R · Post by **Dave-R** » Wed Sep 17, 14 2:52 pm

Carl wrote:Prior to setting number 1 up with an inlet and exhaust valve etc. I marked the top of the valve stem so I can see how the roller rolls across the top of the stem this tells me if I have the correct length push rod. If the mark is too close to the exhaust side, the push rod is too long, too close to the inlet and the push rod is too short, you want it as close to the centre as possible. This as close as I could get it without running out of adjuster thread. You need an adjustable push rod to get the correct length

I think you need to shim under the rocker shaft to get the mark dead centre on the top of the valve stem. I think 20thou shims are available?

Carl · Post by **Carl** » Wed Sep 17, 14 3:37 pm

Yes your probably right I was thinking that too

Les Szabo · Post by **Les Szabo** » Wed Sep 17, 14 4:06 pm

All very nice, but where did it say you check VTP clearance with a bone dry Hyd lifter?.....did you use lightweight springs on the test or the springs your going to run?.

Jon Connolly · Post by **Jon Connolly** » Wed Sep 17, 14 7:42 pm

Carl

I can`t tell, are they 273 rockers ??????????????

Carl · Post by **Carl** » Wed Sep 17, 14 7:45 pm

Les Szabo wrote:All very nice, but where did it say you check VTP clearance with a bone dry Hyd lifter?.....did you use lightweight springs on the test or the springs your going to run?.

It didn't say anywhere to use bone dry hyd lifters. I know I should of used a solid lifter, I didn't have any at the time so I thought I would see what I got by using a hyd lifter to be honest it has been playing on my mind to re do it so I've got hold of a couple of solid lifters and will do it again properly this time.

I didn't use light weight springs, but lighter springs than the recommended springs for the cam for the break in.

Carl · Post by **Carl** » Wed Sep 17, 14 7:57 pm

Jon Connolly wrote:Carl

I can`t tell, are they 273 rockers ??????????????

I believe they fit all small blocks Jon.

Les Szabo · Post by **Les Szabo** » Wed Sep 17, 14 8:02 pm

Just trying to make sure you get a more accurate VTP check...you would prob be ok with that cams overlap and duration,......the prob with an empty hyd. lifter is that they have a certain amount of compression distance, when its dry you can Bananarama! down past the point it would normally go when the engine is running and it has oil in it. This will give you less lift on the VTP test.

Les

Mossy68 · Post by **Mossy68** » Wed Sep 17, 14 8:21 pm

Coming on great mate.
At this rate you'll be back on the road way before me !!

Carl · Post by **Carl** » Thu Sep 18, 14 4:16 pm

Dave wrote:
Carl wrote:Prior to setting number 1 up with an inlet and exhaust valve etc. I marked the top of the valve stem so I can see how the roller rolls across the top of the stem this tells me if I have the correct length push rod. If the mark is too close to the exhaust side, the push rod is too long, too close to the inlet and the push rod is too short, you want it as close to the centre as possible. This as close as I could get it without running out of adjuster thread. You need an adjustable push rod to get the correct length
I think you need to shim under the rocker shaft to get the mark dead centre on the top of the valve stem. I think 20thou shims are available?

I need lash caps I recon, lifting the rockers will push the roller closer to the exhaust side. I need to bring the rear of the rocker down and the roller side up to bring the roller closer to the centre of the valve stem, shortening the adjustable push rod and setting the lash to get it anywhere near the centre of the valve requires the rocker adjuster to have to wind down too far, I could get longer valves, another alternative is to have the pedestals milled down, or I need another set of rockers?

Dave-R · Post by **Dave-R** » Thu Sep 18, 14 4:39 pm

Carl wrote: lifting the rockers will push the roller closer to the exhaust side.

You sure?

Raising the rocker will mean it has to rotate down more. It rotates in the direction of the inlet side yes?

I might be wrong. You had better check.

Pete · Post by **Pete** » Thu Sep 18, 14 4:50 pm

I would be very interested to hear the different in P-T-P clearances between a solid and hydraulic lifter - I have only used Solid ones for this check........

Carl · Post by **Carl** » Thu Sep 18, 14 4:54 pm

I am using a solid lifter too Pete.