Bmann412's AMC 304 Rebuild - Page 3 - JeepForum.com
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post #31 of 259 Old 03-16-2020, 11:51 AM Thread Starter
Bmann412
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Quote:
Originally Posted by Axhammer View Post
You can degree it with all eight installed. The only reason for doing it with only #1 installed is it will turn over easier. When doing the process you have to turn to forwards and backwards several times as you check and double check the valve opening and closing events. I used to think checking a cam with a degree wheel was boloney until the last engine I put together. It was off several degrees, and I had to fix it.

Makes sense I will have to pick up a cam degree wheel when I decide which cam I am using.

Quote:
Originally Posted by Matt1981CJ7 View Post
You'll have to compare the installed spring height and spring loads for the 2 cams to determine if your existing springs will work. That information should be on the cam card for each cam, or you can research it online.



Matt

I will have to find the cam card for the cam I currently have and post it here.


1998 TJ 5.9l
1978 CJ7 Renegade
2013 JK
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post #32 of 259 Old 03-16-2020, 08:12 PM Thread Starter
Bmann412
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Current Cam Specs

Summit Racing Part Number:MEL-CL-SRC-5

UPC:00729295150701
Cam Style:Hydraulic flat tappet
Intake Duration at 050 inch Lift:196
Exhaust Duration at 050 inch Lift:196
Duration at 050 inch Lift:196 int./196 exh.
Advertised Intake Duration:263
Advertised Exhaust Duration:263
Advertised Duration:263 int./263 exh.
Lobe Separation (degrees):110
Computer-Controlled Compatible:No
Lifters Included:Yes
Lifter Style:Hydraulic flat tappet

Lunati 250/256

Advertised Duration (Int/Exh): 250/256
Duration @ .050 (Int/Exh): 208/213
Gross Valve Lift (Int/Exh): .484/.484
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1000-5200

1998 TJ 5.9l
1978 CJ7 Renegade
2013 JK
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post #33 of 259 Old 03-17-2020, 07:25 AM
Matt1981CJ7
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None of that tells you about the valve springs.

I used Comp Cams #910 springs with my Lunati cam. They have a 100# seat and 300# open pressures.

If your machinist put stock springs in, they should around 70/200# seat/open, so they will be a little too light for the Lunati cam.

Matt


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post #34 of 259 Old 03-17-2020, 08:01 AM Thread Starter
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Email I got from lunati


“with new springs you will be fine.. old springs that have been cycled a million times you would need to change”

1998 TJ 5.9l
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post #35 of 259 Old 03-17-2020, 08:24 AM
Matt1981CJ7
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Do you know what springs were installed?

Matt


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post #36 of 259 Old 03-17-2020, 08:30 AM Thread Starter
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I wish I knew based on the cam and other parts in the kit it’s a mellings part


Sent from my iPhone using Tapatalk

1998 TJ 5.9l
1978 CJ7 Renegade
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post #37 of 259 Old 03-17-2020, 08:34 AM
Matt1981CJ7
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I'm surprised by Lunati's response considering they have no idea what springs were installed. Seems a little reckless to me.

Matt


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post #38 of 259 Old 03-17-2020, 08:40 AM Thread Starter
Bmann412
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Quote:
Originally Posted by Matt1981CJ7 View Post
I'm surprised by Lunati's response considering they have no idea what springs were installed. Seems a little reckless to me.



Matt


I was expecting more questions from them as well. I will see if they listed the part number on the receipt from the machine shop

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post #39 of 259 Old 03-17-2020, 12:34 PM Thread Starter
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Recommend spring and stats from Lunati


spring kit # 73126K1


These springs are rated as 103lbs at the seat installed at 1.800" open pressre is 303 lbs @ 1.250 coil bind is @ 1.100 spring rate is 364 1.500" od 1.086" id

1998 TJ 5.9l
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post #40 of 259 Old 03-17-2020, 01:51 PM
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Be careful with the Lunati springs. The ones they sent with my cam, which were suppose to fit an AMC V8, had the wrong diameter and were sloppy in the spring seats. That's why I ended up using the Comp Cams #910 springs. They fit perfectly and had the correct spring specs.

Matt


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post #41 of 259 Old 03-17-2020, 02:01 PM Thread Starter
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Quote:
Originally Posted by Matt1981CJ7 View Post
Be careful with the Lunati springs. The ones they sent with my cam, which were suppose to fit an AMC V8, had the wrong diameter and were sloppy in the spring seats. That's why I ended up using the Comp Cams #910 springs. They fit perfectly and had the correct spring specs.



Matt


Wasn’t really planning on running those specifically. Just trying to determine if what I got is sufficient for the cam.

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post #42 of 259 Old 03-17-2020, 02:03 PM
Matt1981CJ7
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Can't your machinist shed some light on what springs he used?

Matt


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post #43 of 259 Old 03-17-2020, 02:11 PM Thread Starter
Bmann412
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Originally Posted by Matt1981CJ7 View Post
Can't your machinist shed some light on what springs he used?



Matt


I have been meaning to give him a call. I was going to check the paper work I got back for the machine shop.

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post #44 of 259 Old 03-17-2020, 05:40 PM Thread Starter
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Ok found the information I think that is needed. unfortunately I am not quite sure what I am looking at what i should be looking for.

Melling VS-970

Closed Height: 1.800 IN
Closed Pressure: 70 PSI
Coil Bind Height: 1.225 IN
Grade Type: Regular
Inside Diameter: 0.955 IN
Open Height: 1.400 IN
Open Pressure: 208 PSI
Outside Diameter: 1.355 IN
Spring Type: Single Spring

Recommend Spring Kit From Lunati
spring kit # 73126K1

These springs are rated as 103lbs at the seat installed at 1.800"
open pressre is 303 lbs @ 1.250
coil bind is @ 1.100
spring rate is 364
1.500" od
1.086" id

1998 TJ 5.9l
1978 CJ7 Renegade
2013 JK
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post #45 of 259 Old 03-17-2020, 06:27 PM
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Subscribed. I started a full rebuild on my ‘77 CJ7 a few months ago. I should be rebuilding my 304 within a couple months. Thanks for starting this thread, I may need to reach out to you down the road for advice
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