Help ID this 340 head setup, looks hardcore !!!!!
#815021
09/26/10 05:07 PM
09/26/10 05:07 PM
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Joined: Jan 2003
Posts: 1,018 Hazlet, NJ
440Satellite
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 1,018
Hazlet, NJ
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Hey guys, I just picked up and brought home a complete and running 340/904 tranny setup I bought on ebay. Anyway first I noticed the intake had some light porting under the carb, then I took off the valve covers to find some pretty hard core setup that I havent seen before. Now they are J heads and the motor is block # 2780930 340 5 and date coded 7 2 70. But there seems to be dual springs with dampers, non-steel retainers( any ideas) and big aluminum blocks for bolting down the adjustabe rockers. Also if you look down the head into the block there is a big aluminum plate with holes for the pushrods that I've never seen before.
So can anyone tell me anthing about this setup? It was soposedly a good running motor but I'm gonna tear it down to inspect and see what else lies beneith, but I figure maybe someone can help me out on this one. Heres a few pictures.
Butch
Last edited by 440Satellite; 09/26/10 07:39 PM.
1972 Duster
318 4 speed
1958 392 Hemi engine
waiting to be built!!!!!
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: 440Satellite]
#815025
09/26/10 10:09 PM
09/26/10 10:09 PM
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Joined: Jan 2003
Posts: 5,903 Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,903
Florida
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If the retainers are aluminum, recycle them ASAP before you have to recycle the whole engine. If they are titanium retainers, you're fine.
The blocks were a valvetrain trick to help geometry, usually with long stem valves and/or get clearance for larger diameter valve springs. Milled rocker shaft pads were standard on race W-2 heads. Econo W-2 had OEM-style cast stands.
Double-check the rocker contact patch on the valve to make sure it's not to far inward towards the shafts.
The plate inside may be a Milodon or similar valley tray that has a pair of spring steel straps that snap under the heads. It keeps the lifter in its bore in case there is a valvetrain failure. Otherwise, a lifter popping out could cause rapid oil pressure loss.
The intake looks like an original Edelbrock Torker or Tarantula intake. My personal opinion is that either one is junk compared to what is available today.
I also just noticed that the oil squirt holes on top of the rockers have been closed off with a set screw!
Do the hold-down bolts go through the middle of the rocker shaft or is the shaft offset towards the intake?
Intersting set-up. I'm curious what's inside too! This should probably be in the Unlawful's Race Only section.
Last edited by Locomotion; 09/26/10 10:20 PM.
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: Locomotion]
#815028
09/26/10 11:34 PM
09/26/10 11:34 PM
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Joined: Jan 2003
Posts: 1,018 Hazlet, NJ
440Satellite
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super gas
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super gas
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Hazlet, NJ
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Ok, first is there a way to tell if the retainers are aluminum or titanium, looks like this motors seen a good amount of use and there still looking good. And your right on the blocks, the rocker shaft mount was milled down, the bolt goes throught the rocker shaft and block and into the head where it normally bolts up, but with larger bolts. Ans your also right on the valley pan , I took the intake off and it is held on with 2 spring straps, so your probably right there too.
Well I got the intake off and pulled one head, they are indeed J heads, with what looks like stainless 2.02 intake and exhaust valves. Looks like they did some heavy port matching as the intake port on all of them hit the valve cover bolt area in between intake ports.
Also after pulling the heads I found TRW .030 over L-2322 forged dome pistons. The cylinder walls look great, there isnt even a ridge on top once I wipe away the carbon, and I can still see cross hatch. Strange thing is, that there is no notable bore scorring or were, but the pistons are really loose in the bore, but I was able to see one top ring gap and by eye it looks good. Now heres the other thing, the pistons look like the valve reliefs were cut deeper, and thy must have cut too deep on one, cause a couple chunks are missing. But with the piston with the missing peice, the walls look great and there no chunk in the bore, and it looks like it has been runn for a long time like this?
So heres a few more pictures, what do you think, can that one piston be run like that, well it was running so I quess I answered my own question. But why would pistons be run so loose?
Butch
1972 Duster
318 4 speed
1958 392 Hemi engine
waiting to be built!!!!!
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: 440Satellite]
#815029
09/26/10 11:37 PM
09/26/10 11:37 PM
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Joined: Jan 2003
Posts: 1,018 Hazlet, NJ
440Satellite
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super gas
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OP
super gas
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Hazlet, NJ
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Ohh yeah the drivers side front block # is
G340P33750547 then theres a 43 with a 3 under thats stamped sideways
And the heads are AAWJ 3418915(G or C cant tell)
Last edited by 440Satellite; 09/27/10 07:14 AM.
1972 Duster
318 4 speed
1958 392 Hemi engine
waiting to be built!!!!!
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: 440Satellite]
#815034
09/26/10 11:44 PM
09/26/10 11:44 PM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Looks like you left a letter out after the G? At any rate what you posted breaks down as a: G-Series (1971 model year) 340 P = Premium Fuel October 24th 1970 Assembly date 547th engine assembled Cool engine, but you better have lots of race fuel around with those pistons, that is one old school build! IMO I'd tear it down and start over with all fresh parts, pistons, rockers, etc. Maybe even the heads if those have been overly ported.
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: 440Satellite]
#815035
09/26/10 11:46 PM
09/26/10 11:46 PM
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Joined: Jan 2003
Posts: 29,679 Hamtramck, PA
Alaskan_TA
Fluffy Balladeer
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Fluffy Balladeer
Joined: Jan 2003
Posts: 29,679
Hamtramck, PA
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Quote:
3418916
Most likely 3418915
They can be hard to read at times, but 915 goes with J & a few other letters.
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: Alaskan_TA]
#815036
09/27/10 01:43 AM
09/27/10 01:43 AM
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Joined: Jan 2005
Posts: 12,478 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
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Posts: 12,478
Kalispell Mt.
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Those valve releifs have been machined deeper than my set of the same pistons, that is why they broke through on the ring lands. Those pistons are not too high of compression with stock heads, they don't come in anywhere near what they are suposed to unless the heads or deck have been milled a lot.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: HotRodDave]
#815038
09/27/10 01:47 AM
09/27/10 01:47 AM
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Joined: Jan 2003
Posts: 17,547 Las Vegas, NV
6bblgt
I Live Here
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I Live Here
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Las Vegas, NV
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Quote:
...... that is why they broke through on the ring lands ......
Looks like they "burned through" to the ring & cylinder wall, look at the burn mark at the top of the cylinder.
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: HotRodDave]
#815039
09/27/10 07:01 AM
09/27/10 07:01 AM
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Joined: Jan 2003
Posts: 1,018 Hazlet, NJ
440Satellite
OP
super gas
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OP
super gas
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Hazlet, NJ
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Ok heres another picture of the damaged piston.
1972 Duster
318 4 speed
1958 392 Hemi engine
waiting to be built!!!!!
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Re: Help ID this 340 head setup, looks hardcore !!!!!
[Re: 440Satellite]
#815040
09/27/10 07:05 AM
09/27/10 07:05 AM
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Joined: Jan 2003
Posts: 1,018 Hazlet, NJ
440Satellite
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 1,018
Hazlet, NJ
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And heres a good shot where you can see how loose it is, look at how much ring you can see on the sides, now keep in mind that this motor is filthy on the outside and going by the gaskets, hasnt been apart in a long time, looks like since it was built. What would be the reason for such loose pistons.
1972 Duster
318 4 speed
1958 392 Hemi engine
waiting to be built!!!!!
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