Posted By: plumber425
W2 340 heads - 01/11/10 10:45 PM
I have w2 heads on my 340 Duster & just found out one has 2 cracks in it.. I found a set on e-bay but the casting #'s are different than mine. my # is 3870810 his are 3577634 I called the mopar tec line they never seen this #. and suggested this site anybody know if these are the same as my heads? the pics. look like mine....
Thanks
Mike
Posted By: formula S
Re: W2 340 heads - 01/11/10 10:50 PM
sounds like an early set get a hold of RyanJ he can help you
http://www.shadydellspeedshop.com/
Posted By: S/ST 3040
Re: W2 340 heads - 01/11/10 10:56 PM
I'd hold off on anything that didn't match up. 3870810 casting
spanned several years and are pretty east to find. There were
a few different versions of the same casting. Pictures would
help a lot.
Welcome to Moparts.
Posted By: plumber425
Re: W2 340 heads - 01/11/10 11:02 PM
Thanks I called there just b4 the mopar tec. line I didnt get a call bk. yet
Thanks
Mike
Those look like the 810 heads, they are the early heads as noted (usually casting dates will be between 1976-1978, the majority were 1977) they are identifiable by the freeze plugs in the ends, they had allot of casting variability and it was common that they cracked, usually because of port work in an area where there was unpredicted core shift (AMHIK).
The later heads that have "W2" cast into the sides under where the spark plug holes, and no freeze plugs in the ends, they are/were cast better. Same basic heads, (respective to Race or Econo) just a better/later casting.
As noted the heads in the auction look EXTENSIVELY ported, those are probably some of the earliest heads made if Petty had them, and likey better than average concerning core shift issues,I'd still be leary about cracks, thins spots, or epoxy filled holes with that set.
Posted By: plumber425
Re: W2 340 heads - 01/12/10 02:38 AM
Posted By: S/ST 3040
Re: W2 340 heads - 01/12/10 02:47 AM
That's what I would call a "1st Generation" W-2. 77-early 80's.
Freeze plugs are dead give-away. They're around. Keep looking.
I have ONE for R&D.
Post an ad in "SB Parts Wanted"
Posted By: plumber425
Re: W2 340 heads - 01/12/10 02:58 AM
Yes mildy ported. cant tell in these pics.. How can u tell e-bay intake valves are bigger?
Posted By: S/ST 3040
Re: W2 340 heads - 01/12/10 03:04 AM
Research and Development.......you know. Grind holes in, etc.
Here's a post where we discussed those E-bay W-2s briefly. Not the same as your's.
https://board.moparts.org/ubbthreads/show...rue#Post5663318
Posted By: plumber425
Re: W2 340 heads - 01/12/10 03:32 AM
I dont know if they would work on my motor. my heads have the long valves and I think they should have the short ones I had smith bros. make push rods to fit these valves & if these e-bay heads have short valves they wont work Im going to sell this car so I dont want to get in to deep....
Posted By: S/ST 3040
Re: W2 340 heads - 01/12/10 03:39 AM
If your heads have offset rocker shafts and stands, they should have 5.280"-5.300" valves.
Post some pictures of your car and tell us about it.
Street? Strip? What's it run?
Posted By: plumber425
Re: W2 340 heads - 01/12/10 04:07 AM
Street/Srtip when I got the car it was runnin 12.20s with some dialn 12 teens. Freshend the motor & got it to go 11.821 @ 115 MPH WITH the cracked head
Posted By: plumber425
Re: W2 340 heads - 01/12/10 04:18 AM
Here is a video of a small burnout. I was playin with the pro tree for the first time...Im kinda new at this.. This was a 12.20 pass with the old motor...
http://www.youtube.com/watch?v=TIn8R3G1s4M
Posted By: MR_P_BODY
Re: W2 340 heads - 01/12/10 05:00 AM
By the way... I forgot to say... welcome to the jungle
Posted By: quick77rt
Re: W2 340 heads - 01/12/10 05:31 AM
The lowers my 76 crane/petty heads...I do not know how they machined them with no cut throughs.
Std 76 810 castings...
They are numbered/matched.
The upper is a hand ported (not by me 97 set).
I know the numbers for both, I know the early ones are not considered the best, but I got to try them any way.
OP check you pm box.
