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Original stock 390
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70amcpwr View Drop Down
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 70amcpwr Quote  Post ReplyReply Direct Link To This Post Posted: Feb/26/2017 at 5:19am
Originally posted by 69 ambassador 390 69 ambassador 390 wrote:

Don't use the Chevy ones, not good geometry. Use the Ford small block non-rail ones. The Summit brand roller tips are excellent and we use many of them.


OK help me out here. Summit is listing them as 1.6 ratio and AMC/Chevy. If I recall, 1.6 is the correct ratio and they're the only ones that the listing says AMC, so wouldn't they be the correct ones?

Again, thanks for the input as most of you have forgot more than I know in regards to this.
70amcpwr You just can't fix stupid.
SOLD 1970 BBO Javelin, wifes 73 AMX 360 4spd. Next project 1969 AMX
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 70amcpwr Quote  Post ReplyReply Direct Link To This Post Posted: Feb/26/2017 at 6:01am
So would this be preferred?

https://www.summitracing.com/parts/cca-1442-16
70amcpwr You just can't fix stupid.
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Points: 519 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DoughertyAMX Quote  Post ReplyReply Direct Link To This Post Posted: Mar/28/2017 at 5:33pm
Originally posted by 70amcpwr 70amcpwr wrote:

So would this be preferred?

https://www.summitracing.com/parts/cca-1442-16



Yes, those are what I am putting on my 70 390.
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Points: 4165 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 348AMX Quote  Post ReplyReply Direct Link To This Post Posted: Mar/28/2017 at 6:49pm
check for bent pushrod/s
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Points: 4866 		Post Options Post Options   Thanks (0) Thanks(0)   Quote White70JavelinSST Quote  Post ReplyReply Direct Link To This Post Posted: Mar/29/2017 at 9:04am
Cheaper, not sure if better, however not pressed steel either.

Had these recommended by a reputable AMC engine builder.

http://www.ebay.com/itm/Ford-SB-289-302-351-Windsor-1-6-3-8-Stainless-Steel-Roller-Rocker-Arms-/172589735851?hash=item282f265fab:g:GyIAAOSwXYtY05Z3&vxp=mtr
70 Javelin SST, second owner, purchased 1972
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 70amcpwr Quote  Post ReplyReply Direct Link To This Post Posted: Mar/29/2017 at 12:46pm
Originally posted by 348AMX 348AMX wrote:

check for bent pushrod/s


They're all perfect.
70amcpwr You just can't fix stupid.
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Points: 2752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Mar/29/2017 at 3:50pm
Originally posted by White70JavelinSST White70JavelinSST wrote:

Cheaper, not sure if better, however not pressed steel either.

Had these recommended by a reputable AMC engine builder.

http://www.ebay.com/itm/Ford-SB-289-302-351-Windsor-1-6-3-8-Stainless-Steel-Roller-Rocker-Arms-/172589735851?hash=item282f265fab:g:GyIAAOSwXYtY05Z3&vxp=mtr

Price is great and they look decent,
but I worry about off brand roller rockers coming apart and pumping those pesky little needle bearings through the engine. Ouch
71 P-code 4spd Javelin/AMX
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Points: 718 		Post Options Post Options   Thanks (0) Thanks(0)   Quote n2ojoe Quote  Post ReplyReply Direct Link To This Post Posted: Mar/29/2017 at 4:16pm
Originally posted by 69 ambassador 390 69 ambassador 390 wrote:

Don't use the Chevy ones, not good geometry. Use the Ford small block non-rail ones. The Summit brand roller tips are excellent and we use many of them.

Yep, I have used these before and they are good quality. The geometry is correct.
https://www.summitracing.com/parts/sum-141708pl/overview/make/american-motors
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 70amcpwr Quote  Post ReplyReply Direct Link To This Post Posted: Jul/16/2017 at 7:23am
Finally getting around to going back together and hit a huge snag I over looked (surprised actually no one else had this issue, well not really). I didn't check stud size as I assumed (huge mistake w/anything AMC) the application charts were correct. I've got 7/16 studs.

Now try to find an inexpensive 1.6 ratio 7/16 stud rocker that doesn't require replacing push rods (heat treated), "some head machining" and adding guide plates (which in past experience may not fit under stock valve covers).

Summits answer twice hasn't worked.

Thinking of Three Options:

1) Replace studs to 3/8
2) Use Comp 17044 w/o guide plates
3) Use Comp 1451 which is a 7/16 1.5 ratio steel roller tip rocker, will this have any real negative performance effect on the old style cylinder heads? https://www.summitracing.com/parts/CCA-1451-16/


Open to other options in the $200 range. Any help today would be great as I want to order ASAP, Thanks
70amcpwr You just can't fix stupid.
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 70amcpwr Quote  Post ReplyReply Direct Link To This Post Posted: Jul/16/2017 at 7:48am
Also wondering......Are the "X" castings coincidences (obviously not on the block)? If not how many parts were cast special for the 390?

Piston, camshaft and bearing pictures when they came out, not cleaned.
70amcpwr You just can't fix stupid.
SOLD 1970 BBO Javelin, wifes 73 AMX 360 4spd. Next project 1969 AMX
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