Comp Cam lifters 5/16 push rod cups - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 10 (permalink) Old 07-12-2019, 09:46 AM Thread Starter
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Comp Cam lifters 5/16 push rod cups

Hey All,

First post after trying to find this question with no luck.

Im rebuilding my FE 390 and bought Comp Cam 33-224-3 (268H) cam and matching lifters. After inspecting the parts and doing some research, the Comp lifters have a 5/16" cup and my factory push rods have 3/8" ball on both ends. I realize I will likely be ordering new push rods when I measure after my factory heads are machined.
My question is...how do us FE guys find suitable push rods with a 5/16 ball one end and 3/8" ball on the other to fit the factory rockers? I could order them custom I suppose as one option. My other thought was getting a set of new factory OEM hydraulic lifters to use with the Comp cam. Of course the guy at Comp says this would void any warrantee. Has anyone used OEM lifters with a mild aftermarket cam?
Any advice would be appreciated.

I think I have posted this in the right forum this time...
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post #2 of 10 (permalink) Old 07-12-2019, 01:07 PM
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Re: Comp Cam lifters 5/16 push rod cups

if you measure the depth of the lifter cup you will find it to be less than half the depth of a 3/8 ball. i bet the lifters are fine with your pushrods
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post #3 of 10 (permalink) Old 07-12-2019, 06:13 PM
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Re: Comp Cam lifters 5/16 push rod cups

The ball is at the lifter end of the pushrod, the cup is at the rocker arm end if you have adjustable rockers.

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post #4 of 10 (permalink) Old 07-13-2019, 06:28 AM Thread Starter
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Non-adjustable rockers. The cup I'm referring to is on the lifter in which the push rod ball end sits.
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post #5 of 10 (permalink) Old 07-13-2019, 02:09 PM
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Re: Comp Cam lifters 5/16 push rod cups

I would not worry about Comps warranty, it's not worth the read. No matter what goes wrong its installed incorrectly and not there problem.

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post #6 of 10 (permalink) Old 07-13-2019, 05:23 PM Thread Starter
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Extech...I used a marker to get witness marks on the push rod ball and it is definitely sitting on the thin chamfer at the edge of the lifter cup. I suspect it wont last too long like that. I dont have big spring pressure...but not liking how it is sitting. The stock lifters swallow up the whole radius of the ball.
I like the comment about the warrantee...not worth the paper its written on. Im leaning toward using a new set of OEM lifters...Im sure they wont be any less of a part than Comp Cam's lifter. Then I can use the standard size double ended 3/8" ball rods.
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post #7 of 10 (permalink) Old 07-13-2019, 07:02 PM
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Re: Comp Cam lifters 5/16 push rod cups

since different size pushrod ends are hens teeth. i agree that stock lifters will be fine with a mild cam
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post #8 of 10 (permalink) Old 07-14-2019, 08:26 AM
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Re: Comp Cam lifters 5/16 push rod cups

I was going to say, you probably have the wrong lifters...
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post #9 of 10 (permalink) Old 07-15-2019, 03:50 AM
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Re: Comp Cam lifters 5/16 push rod cups

This is a common issue with some lifters, in some cases, it's a SBF lifter and height is wrong too. I have seen some from Comp with sort of a chalice shape allowing either cup size, but your witness mark shows it's the wrong cup. I now only use Lunati Camsavers when building a hyd flat tappet FE for this reason. They have the correct height and pushrod size.

You can buy custom pushrods, which would not be a bad idea to address preload per cylinder too, but they will likely surprise you on cost for a 5/16-3/8. You can also buy a set of Lykins Motorsports hyd non-adjustable 1.76 roller rockers, he designed them with 5/16 ends to allow a much cheaper pushrod to be used. That is what I have been doing on hyd roller FEs because they have the same design

Likely easiest/cheapest way is to buy some Camsavers, they are also a very good lifter. Be sure to check preload though regardless, I have found that most FE pushrods are long from the factory, and valve tips are often all over the place.

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post #10 of 10 (permalink) Old 07-15-2019, 01:50 PM Thread Starter
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Re: Comp Cam lifters 5/16 push rod cups

n2omike: I was thinking the same thing, but the lifters are the part number paired with that cam. I even emailed Comp Cam to ask why an FE lifter would be sized for 5/16" ball since they all came with a 3/8" ball

The Comp lifters share the same dimensions of the OEM lifters, with the exception of the cup size.

My427stang: I searched camsavers, looks like Crower makes them. Some of the forums suggest oil issues...like lower oil pressure on an engine that already has lower pressure. Do you run the stock volume oil pump without any issues? I would think this style of lifter would help with break-in as well

Since I need a little machining on the rocker valve pad, maybe they can touch up the cup for a 5/16"ball. Although the camsavers seem like the best way to go as long as they dont mess with oil pressure
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