Problems with Harland Sharps and pushrods on Iron Heads

[GNVYUS 1]

Anyone else have a problem with the Harland Sharp Roller Rockers pushing the pushrods against the heads opening and also having the pushrods come up really short in the rockers?

Harland wants two threads to be seen out the bottom of the rockers and mine have none?

Does this sound like I have the aluminum head rockers?

 

[PhilM]

crap... i dont think i checked mine yet, i have same setup, ill check em tomorrow & let ya know

Phil

 

[Blown&Injected]

Depending on the ratio, the pushrods will be moved around in the head.

The pushrods must be measured. Many people come in at about 8.200" but my stock block and heads came in at 8.050".

There is an oil passage in the set screw that must match the oil passage in the rocker arm. About two threads showing puts the oil passages right on center.

There was an issue with the bolt hole location in the rocker shafts. The holes were close but would bind before threading all the way in.

Make sure you accurately check the pushrod length!!!

 

[Mike Licht]

There is no aluminum head rockers from HS. The pushrods are just too long.
Mike

 

[49-blues]

Intercooler used them and broke one on his motor.

 

[GNVYUS 1]

Blown, we have the exact same issue, I am off about the same amount you were.

Should have the new p rods in after we measure with an adjustable first.

I am sure all will be ok but its killing my time frame and winter looks like it officially hit here in IL.

Who would of thought that pulling a motor in early Sept would still be playing around with issues now, not my cold butt this weekend installing it.

 

[TurboTR]

While you're at it, be sure to get a very strong pushrod. At the very least on the exh side. Something like a single tapered 4140 from Manton. The pushrod holes through the head may need clearancing. At the least it needs checking with the new rockers.

TurboTR

 

[DonnieShort]

I had the same problem, Harland Sharp 1.65's, ported stock heads roller cam and lifters. Even on the 8.225" ones that is generally sold for these as the correct size. I had to use 8.150" on mine to get it right and proper adjustment. The 8.225" pushrods were too long causing the valves to hang open with no adjustment

 

[GNVYUS 1]

Wouldn't the head needing clearancing mean that the rockers are a tad bit to long at the tip and not exactly a custom GN part?

If so, I can not imagine anyone NOT having this problem with the rods being on the head openings.

So far, nothing head related has been smooth, especially the VPE end of it with heads having 160 seat pressure leaving their shop.

 

[Blown&Injected]

Mike at Full Throttle has been real quick about getting thick, .080" wall, different length pushrods for me.

The oiling will not be right if the pushrods are off in addition to the other possible issues mentioned. Even Comp Cams says right on their web site that they would love to sell you all the parts but they can't because the pushrods must be checked. With so many stock block and head engines being built here, I thought I could just guess based on what so many others are using but I wound up much shorter than what I have been reading about. Since they are adjustable, there is a bit of leeway.

With 1.60:1 HS rockers, I had only one pushrod come close to the passage thru the head but it seems like it will be OK without grinding that hole.

Harland Sharp rockers have a life time warrantee and were very quick about sending me a new set when I found an issue with the rocker shafts.

What happened to Intercooler's engine?

Dr. I have been going around and round with my rebuild too. In Maryland it seems to go from damn hot to cold with about 45 minutes of comfortable weather in-between but I would rather be a bit cold than sweating my butt off - besides our cars like it cold

 

[PhilM]

Well, I just checked one of em and they fit fine.

Setscrew for adjustment is about halfway. I have a HFT cam in there.





Did I just get "lucky" with something... OMG it's a miracle.

Phil

 

[PhilM]

Harland Sharp rockers have a life time warrantee and were very quick about sending me a new set when I found an issue with the rocker shafts.

These rockers have a lifetime warranty?! What does this cover as I've heard people breaking the tips off.

Phil

 

[Mike Licht]

These rockers have a lifetime warranty?! What does this cover as I've heard people breaking the tips off.

Phil

People, as in more than one, how many? I know of one and in the end it was found that the wrong pushrods (too short) were used.
Mike

 

[Mike Licht]

I have seen these go from 8.300 to 8.050 on a iron head application with roller rockers. 8.225 is most often correct though. If you buy a kit from us all you need to do if they are worng is just let us know the correct size you need and we will supply them on an exchange basis. We have many sizes in .050 increments (and some .025)
Mike

 

[49-blues]

Mike- what difference in pushrod length does it make when using a flat tappet cam vs. a roller cam while also using roller rockers on both? And if using gn-1 heads vs. iron heads should the pushrods be even longer using any of the same scenerios?

 

[Mike Licht]

pushrods with falt cam are about 8.675.
roller 8.225

Champion with flat cam 8.850
Champion roller 8.400

Roller rockers may need a shortwer pushrod

Lengths seem to change much more with roller cams due to different base circles

Block or head machining and different head gaskets also change pushrods
Mike

 

[49-blues]

Between what lengths should i be on pushrod length with a roller cam, gn-1 aluminum heads with cometic .040 gaskets and scorpion roller rockers> i think the ones i have now are about 8.55".- thanks

 

[Mike Licht]

No one can answer that. There is only one way, measure. If you have the correct pre load and rocker adjustment then the roller on the rocker is in the middle of the valve at mid lift, if so, you have the right length. If it is to the outside at mid lift you are too long and if it is to the inside you are too short.
Mike

 

[49-blues]

Thanks Mike-i ll check them.