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head identification

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retard_rambler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote retard_rambler Quote  Post ReplyReply Direct Link To This Post Topic: head identification
    Posted: Sep/03/2012 at 1:08pm
bought an AMX and this motor came as  an extra.heads on it are casting number 3188558 they have 2.08 intakes valves and and 1.625 exhaust valves, 7/16 head bolts plus an added 4 head bolts per side 3/8 in size , located on the lower edge of the head, no extra marking, square exhaust port. My guess is they are just stock heads that someone has played with any thoughts?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbad69 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/03/2012 at 1:30pm
Those are 343/early 390 heads. It sounds like someone put some work into them if they have the extra 3/8" bolts - those are for high compression engines. There could be some port work done as well.
69 Javelin SST BBO 390 T10
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: Sep/03/2012 at 4:30pm
I agree with bigbad69.....the very early 318 8558 heads did not have the "X" cast on the outside of the head.
Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar)
68X,GoPac,390,4sp,52A
69X,GoPac,390,4sp,64A
70X,GoPac,390,4sp,87A,8
70X,GoPac,390,4sp,BBO,8
70 Jav SST,390,AT,BSO
74MatX,401,AT,Prototype
74MatX,401,AT
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Post Options Post Options   Thanks (0) Thanks(0)   Quote retard_rambler Quote  Post ReplyReply Direct Link To This Post Posted: Sep/03/2012 at 10:44pm
ok here's the next part, the block casting number is 3190806 which should be and is a 7/16 head bolt  block. but with the heads bolted on the block the narrow (68-69) intake is too narrow. did AMC raise the deck height on some of the late 7/16 head bolt blocks.  also the heads do have the x cast into them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1971_AMC_GUY Quote  Post ReplyReply Direct Link To This Post Posted: Sep/15/2012 at 12:11pm
3190806 is a 390 built from 68-69 with the 7/16" Head Bolt
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amc-rookie Quote  Post ReplyReply Direct Link To This Post Posted: Apr/27/2013 at 5:09pm
I have a 304 of unknown vintage with a set of dogleg heads.
The casting number look like 3212880-1. I could not find this number in the head chart on-line.
Any ideas? Any value?
Thanks,
Dave
Project finally underway $$$! near-basket case 1968 AMX #2789 was 290/auto will be 343/auto

Son's car 1968 Javelin 6cyl/3 speed
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Post Options Post Options   Thanks (0) Thanks(0)   Quote silver71 amx Quote  Post ReplyReply Direct Link To This Post Posted: Jan/23/2019 at 3:40pm
321 2990 were used late 1971 to early 1972

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Post Options Post Options   Thanks (0) Thanks(0)   Quote myrambler Quote  Post ReplyReply Direct Link To This Post Posted: Jan/23/2019 at 7:47pm
The block may have been decked, this will cause fitment issues with the intake. I would suggest taking it to a machine shop and have it checked for square and also check readings to factory specs. Check piston height also. The 8558 heads are 67-69 343/390 square ports with 7/16 head bolts. should be correct for your block, based on the additional bolts added note the engine has been rebuilt at some point. you can buy thicker intake gaskets to use these heads on your engine. but you still need to check block IMO. I recently had a 343 rebuilt and discovered it had been previously machined, however the block had to have additional machining done to square it up. Same problem when it was done, intake didn't fit tightly so we ordered thicker gaskets for intake. alignment of bolt holes is also an issue if block, heads or intake have been machined. 
I am no expert here but there are so many variables that its worth having things checked before you sink a bunch money into a build. 

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