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Will these work on 304? |
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75Cj5
AMC Apprentice Joined: Apr/05/2021 Location: Decatur, Tx. Status: Offline Points: 60 |
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Posted: May/05/2021 at 11:56am |
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I have been trying to find full roller rockers that fit my budget... It is next to impossible, but I found these. The ratio and capacities seem to line up but don't want to dig back into this motor for a third time because I made an assumption.
They say that these are for Ford small block, has anyone used rockers that do not "specifically" say they are for AMC? Thanks. |
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1975 CJ5
AMC 304 |
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4085 |
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The problem you will have is that if you have 75 heads with bridged rockers, you will have to buy either Harland-Sharp or Scorpion rockers designed for the bridged heads. If not, you will need to machine the pedestals about .375" and have them drilled/tapped for GM style studs. You will need to run guide plates and possibly a different length pushrod. Someone here had a writeup on using junkyard LS rockers, but I think they're a 1.7 ratio. Bob tufcj
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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75Cj5
AMC Apprentice Joined: Apr/05/2021 Location: Decatur, Tx. Status: Offline Points: 60 |
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Ok, I am dropping heads off at the shop today so I can have them setup with studs. These say they are self aligning, I went with these because I didn't want to mess with the guide plates. I did see the other posts but it was a little different than this so thought the questions was reasonable. Thank you!
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1975 CJ5
AMC 304 |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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Unless I missed it the only thing I see in the spec is self locking, didn't see any mention of self aligning. How much does machine work and related pieces add to the price over a correct set of rollers for that head style?
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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I thought scorpion recently started offering roller rockers for bridged rocker heads. They can’t be crazy money.... Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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The LS rockers are something I believe JCISWORTHY was doing with success, dont know what heads he was starting with or if any machining was needed. He is a engine builder so an added step when rebuilding a set of heads is not a big deal. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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75Cj5
AMC Apprentice Joined: Apr/05/2021 Location: Decatur, Tx. Status: Offline Points: 60 |
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Heavy 488, it is the seventh line on the overview that addresses the self aligning. I was just going over the numbers again. It was suggested I got full roller vs. roller tip... If I went roller tip then I can get the rockers, studs and guide plates for around $200. Plus another $100 or so for head machining. So roller tip rockers $300-$400. I have not seen any of the other rockers for less than $350... plus they are require the studs and prep work too, so another $150-$200. I may be missing something so please correct me if I am wrong. |
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1975 CJ5
AMC 304 |
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75Cj5
AMC Apprentice Joined: Apr/05/2021 Location: Decatur, Tx. Status: Offline Points: 60 |
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And looking at it this way... there is not much difference in cost. So I guess what makes the most sense is not what I am going to be working on.
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1975 CJ5
AMC 304 |
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75Cj5
AMC Apprentice Joined: Apr/05/2021 Location: Decatur, Tx. Status: Offline Points: 60 |
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I haven't seen this but I am going to look some more. Thanks! |
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1975 CJ5
AMC 304 |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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Harland sharp S-40046A. These bolt on to a bridged rocker head style
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