427w Stroker... cam question - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 5 (permalink) Old 02-06-2014, 02:12 AM Thread Starter
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427w Stroker... cam question

Ok, I just received my stroker 427w short block. I had CHP build me a shortblock where I told them which cam I was looking to run and bought through them. I also ran some other cams by them, but they recommended the same one I had initially requested. Basically my build was based off of a magazine build mostly. Not the best way of doing things, but whatever. Anyways...

I told them I wanted to run a retrofit hyd roller cam (35-426-8) and that I had the correct linked lifters that would be necessary (I got a great deal on them). I bought the cam and a few other items (oil pan), etc.). They degreed the cam and also installed the other things so that I wouldn't have to. Figured let a pro handle it.

I received my shortblock and noticed that they built it on a '94 roller block. I'm not concerned about the strength of the block (Im only looking to put out 525-550hp). My concern now is, what lifters do I use now since it's a small base circle cam? The retrofit cam it is to be used on non-roller blocks. I don't mind buying new lifters (it would be very easy to gain my $ back if I sold the linked lifters), but will that cam even work at all? Is there even a fix besides running a regular hyd roller cam?

I'm going to call CompCams tomorrow and see, but figured I'd throw this out there to you guys since there is so many knowledgeable people here.
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post #2 of 5 (permalink) Old 02-06-2014, 05:09 AM
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Re: 427w Stroker... cam question

As you probably know, the retro cam has a smaller base circle than factory stock and thus the lifters would ride lower in the block. The potential problem is the raised lifter bore height of the 94' roller type block. The issue is that the link bars may not clear the top of the lifter bores. This easy to check.

Put 1 pair of link bar lifters in the block and rotate the crank. (Normally the links face toward the center of the block, but on a 351w it can face the heads if desired.) See if the links bottom out or rubs somewhere. Note how much clearance you have . If it is .050" or more, you are golden. Then move on to another cylinder and check again.

Alternately, so as not to scrap the sides of the lifters in the bores, you could put the cam to the high part of a lobe and carefully try to measure from the crown of the lobe to the top of the block's lifter bore. Then compare that measurement to the new lifters with the bars installed on the work bench. You can only do one lifter bore at a time before rotating the cam to another lifter bore. It won't quite be the same as the links rotating on the lifter, but it might give you some idea ahead of time before actually throwing a pair in the block.

If you can't get the clearance needed, then I believe your only recourse is to replace the cam. The factory individual lifters will ride too short in the block to use the spider and I am unaware of any tall riding ford link bars or individual Ford type lifters that will compensate for the reduced base cam (and of course they get expensive to try.)

There is another possible problem with the 427w in that there could be interference between the rotating rods/pistons and a normal base diameter cam. I've not built a stock block 427w to know for sure and maybe that is only a Chevy problem. I am sure someone will speak up about that.

Dennis

65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. [email protected]

Last edited by dennis111; 02-06-2014 at 05:12 AM.
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post #3 of 5 (permalink) Old 02-06-2014, 10:19 AM Thread Starter
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Re: 427w Stroker... cam question

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Originally Posted by dennis111 View Post
As you probably know, the retro cam has a smaller base circle than factory stock and thus the lifters would ride lower in the block. The potential problem is the raised lifter bore height of the 94' roller type block. The issue is that the link bars may not clear the top of the lifter bores. This easy to check.

Put 1 pair of link bar lifters in the block and rotate the crank. (Normally the links face toward the center of the block, but on a 351w it can face the heads if desired.) See if the links bottom out or rubs somewhere. Note how much clearance you have . If it is .050" or more, you are golden. Then move on to another cylinder and check again.

Alternately, so as not to scrap the sides of the lifters in the bores, you could put the cam to the high part of a lobe and carefully try to measure from the crown of the lobe to the top of the block's lifter bore. Then compare that measurement to the new lifters with the bars installed on the work bench. You can only do one lifter bore at a time before rotating the cam to another lifter bore. It won't quite be the same as the links rotating on the lifter, but it might give you some idea ahead of time before actually throwing a pair in the block.

If you can't get the clearance needed, then I believe your only recourse is to replace the cam. The factory individual lifters will ride too short in the block to use the spider and I am unaware of any tall riding ford link bars or individual Ford type lifters that will compensate for the reduced base cam (and of course they get expensive to try.)

There is another possible problem with the 427w in that there could be interference between the rotating rods/pistons and a normal base diameter cam. I've not built a stock block 427w to know for sure and maybe that is only a Chevy problem. I am sure someone will speak up about that.
Thank you for the reply. Basically, one of my concerns was going to be if the lifters would ride too low. I just called CompCams and asked what they recommended. They said to run link bar lifters (which I have). So I'll throw them in and see if there is any clearance issues. Responses from any others who have run a similar set-up would be appreciated in alleviating my concerns. =)
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post #4 of 5 (permalink) Old 02-06-2014, 12:09 PM Thread Starter
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Re: 427w Stroker... cam question

Alright, I double checked the lifters. None of the link bars hit/interfere with anything.
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post #5 of 5 (permalink) Old 02-06-2014, 02:12 PM
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Re: 427w Stroker... cam question

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Originally Posted by THE EVIL TW1N View Post
Alright, I double checked the lifters. None of the link bars hit/interfere with anything.
Awesome! You should be good to go.

Good Luck with the rest of the build.

Dennis

65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. [email protected]
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