rocker arm choise 347 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 5 (permalink) Old 09-05-2019, 07:00 AM Thread Starter
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rocker arm choise 347

I have a 302 d8ve-6015-a3a block +30 over, and have the eagle B16422MA030 balanced 347 kit, comp cams hydraulic rollercam retro cca-cl31-600-8, procomp 62cc heads and edelbrock proflo 4 injection, What Ratio should i have on the rockerarms, or shoud i go for standard?
Thanks
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post #2 of 5 (permalink) Old 09-05-2019, 07:43 AM
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Re: rocker arm choise 347

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Originally Posted by Hap71 View Post
I have a 302 d8ve-6015-a3a block +30 over, and have the eagle B16422MA030 balanced 347 kit, comp cams hydraulic rollercam retro cca-cl31-600-8, procomp 62cc heads and edelbrock proflo 4 injection, What Ratio should i have on the rockerarms, or shoud i go for standard?
Thanks
Installing a hydraulic roller cam in an older block requires paying attention to a lot of details. First, you will need a distributor that has a gear for a steel hydraulic roller cam. Cast iron flat tappet cams use an iron gear on the distributor, which is not compatible with the steel hydraulic roller. The cheapest way to go, is to buy a replacement distributor for a 1985 mustang, as that was the only year that had had a hydraulic roller cam with a carburetor. You can plug it into whatever ignition you are running. Of course, you can also buy an MSD distributor or something similar... as they have much more easily adjustable ignition advance curves.

You will need a compatible cam thrust plate and timing chain set. Go to the links I posted in the '302 cam thrust plate' thread in the All Ford Techboard.

Make sure the springs match the camshaft, and rocker geometry is correct... or you may destroy things before the first oil change. I won't go into retro cams vs. standard... But you can use standard base circle cams with link bar lifters, and it's a much better setup than using the reduced base circle retro-fit cams. The link bar lifters for use with a standard cam use to be more expensive than standard lifters used with the retro setup. And again, learn to check rocker geometry. I guarantee you will need custom length pushrods, which can be ordered. Your heads will use guide plate, which will require hardened pushrods. You can easily order custom lengths from Smith Brothers, Manton... and even Summit. You won't need anything special other than being hardened and the right length.

As for your original question... Standard ratio rockers will be just fine. Choose a name brand, and resist the cheap, crappy Chinese stuff.

Good Luck
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post #3 of 5 (permalink) Old 09-05-2019, 09:59 AM Thread Starter
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Re: rocker arm choise 347

Hi. And thanks for quick reply.
In the Proflo 4 there is an msd distributor with the set, do i need to change the gear on this? the block is a 1978 Lincoln block that is the same as the old mexikan/hipo block.
In my 68 block i have scorpion roller rockers standard ratio, will these be good for this combo, i will purchase the timing chain set and the thrust plate, this was very valuable information that i did not think about.
This is the camshaft i have https://www.summitracing.com/int/par...00-8/overview/ i will need guides and hardened rods, but i dont have any data on the springs as they was bought by the last owner of the block, but never taken in use, the only thing i know is that there is dual springs.
Thanks again
Helge
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post #4 of 5 (permalink) Old 09-05-2019, 10:48 AM
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Re: rocker arm choise 347

Quote:
Originally Posted by Hap71 View Post
Hi. And thanks for quick reply.
In the Proflo 4 there is an msd distributor with the set, do i need to change the gear on this? the block is a 1978 Lincoln block that is the same as the old mexikan/hipo block.
In my 68 block i have scorpion roller rockers standard ratio, will these be good for this combo, i will purchase the timing chain set and the thrust plate, this was very valuable information that i did not think about.
This is the camshaft i have https://www.summitracing.com/int/par...00-8/overview/ i will need guides and hardened rods, but i dont have any data on the springs as they was bought by the last owner of the block, but never taken in use, the only thing i know is that there is dual springs.
Thanks again
Helge
Hello Helge

I'm assuming you are from another country... and parts may be a LOT more expensive. Your existing roller rockers will be just fine. Scorpion is a good brand.

The valve springs have to be specific for a hydraulic roller cam. If you are unsure, I would recommend having the existing springs tested if you have a spring tester, or buying new ones that are recommended for that camshaft.

As for the distributor gear, a hydraulic roller will require a melonized steel distributor gear. A cast iron gear will have a fairly rough, cast appearance. A steel gear will be smooth. I would advise looking at the gear yourself to see which one you have. It's criminal that Edelbrock does not specify which gear the kit comes with, as using the wrong gear will destroy the cam and distributor gear, while sending metal all through the engine. They should specify, and then offer two part numbers... one for flat tappet cams, and one for hydraulic rollers.

Edit:
I was curious, and actually called their tech line... (slow day) He said the kit comes with an iron gear.... so it's likely that you will need to change it. Look up how to do set the gear height, as it's not always as simple as pressing the original off, and pressing a new one on... as the hole isn't always in the right place. Sometimes, you have to rotate hole in the gear 90 degrees from the hole in the distributor, and drill a new hole at the correct height. You may be able to measure the hole height on both gears (from the bottom of the gear) and get lucky if they are the same. Else, you'll be drilling a new hole.

Cast iron vs Steel



Good Luck

Last edited by n2omike; 09-05-2019 at 11:01 AM.
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post #5 of 5 (permalink) Old 09-05-2019, 12:12 PM Thread Starter
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Re: rocker arm choise 347

Hello Mike

Thanks again

Yes i am from Norway, but the prices are not to bad, but mostly i order from summit, jegs and other trusted companys but the shipping is a killer.

I will order the springs that are recomended to this cam and a new gear to the distributor, and take the rockers from the 68 block, they are almost new, and the engine will be stored if a buyer will have the matching number engine in the cougar.

I cant find any place the making of the thumpr cam, but i am pretty sure it is steel.

Thanks for calling the tech line, i agree edelbrock should have specified what cam it was for, it could have destroyed the engine. I bought the pro flo to fit the 68 engine, it was before i got the newer engine who was already 0.30 over, and i decided to build a more potent engine

I have sendt a request to jegs now, hopefully they have what i need

Thanks
Helge
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