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Author Topic: Any idea what kind of heads these are?  (Read 9148 times)

Offline c10dude75

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Any idea what kind of heads these are?
« on: August 19, 2015, 11:09:03 pm »
Yeah was just curious as to what kind of heads these are tried looking up pictures to see what they might be. I did find something similar but still wasn't it. If anyone knows feel free to comment thank you👌.
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Offline Don5

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Re: Any idea what kind of heads these are?
« Reply #1 on: August 19, 2015, 11:34:45 pm »
There should be a number stamped into the inside of the head. You use the last three digits to decode the head.
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It's been a LONG time since I have been called a newbie. Just sayin....

1979 GMC K15 355, SM 465, 205, 3.73 Dana 44 with a Spartan Locker, 12 bolt Eaton limited slip and 6 inch lift with 36 x 12.50 Super Swamper TSL's.

Offline c10dude75

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Re: Any idea what kind of heads these are?
« Reply #2 on: August 19, 2015, 11:53:45 pm »
Alright ill have to check that out thanks man👍. But yeah I bought this truck about a month ago it looks like it was semi speedy at 1 point so trying to find out what kind of secrets it's hiding haha.
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Offline Irish_Alley

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Re: Any idea what kind of heads these are?
« Reply #3 on: August 20, 2015, 01:16:41 am »
kind of hard to see from the angle and grime on there
does this help?
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When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline c10dude75

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Re: Any idea what kind of heads these are?
« Reply #4 on: August 21, 2015, 07:42:48 pm »
Yeah seen the chart before that's why I was asking cus I didn't see it on there. Thank you for the help hopefully get to the bottom of this soon.
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Offline Irish_Alley

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Re: Any idea what kind of heads these are?
« Reply #5 on: August 21, 2015, 07:54:55 pm »
could you get a better picture?
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline LTZ C20

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Re: Any idea what kind of heads these are?
« Reply #6 on: August 21, 2015, 08:05:41 pm »
That is the casting mark I boxed in red in Irish's post. It is reversed but that is it.

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Offline enaberif

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Re: Any idea what kind of heads these are?
« Reply #7 on: August 21, 2015, 08:46:21 pm »
3927185....69-76...307/327/350..70cc chambers
or
3986339....71......307/350......74cc chambers

The 339 would be better than the 185 but once you get the numbers be easier to tell
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Offline c10dude75

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Re: Any idea what kind of heads these are?
« Reply #8 on: August 22, 2015, 12:24:17 pm »
Yeah I was going to say looked like that L shaped 1 but wasn't sure since it was pointing the other way thought they might of been different but thank you for clearing that up. And alright ill have to look either later today or tomorrow to find out for sure the number.
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Offline c10dude75

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Re: Any idea what kind of heads these are?
« Reply #9 on: August 23, 2015, 09:41:21 pm »
So I looked under the valve cover found this number looks like it says 186? But on that chart it be a different head and that's not possible cus looks nothing like that other head symbol. Also found out the gas is in the oil and when I bought it dude said it had a sticky lifter at full throttle which I comfirmed. But could it just be cus the oil is to thinned out and it's just not oiled properly?
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Offline enaberif

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Re: Any idea what kind of heads these are?
« Reply #10 on: August 23, 2015, 09:47:16 pm »
3927186....69-70...302/350......Camel hump,64cc chambers,accessory holes

An ok head but nothing that great. 64cc chambers are pretty small.
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Offline Irish_Alley

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Re: Any idea what kind of heads these are?
« Reply #11 on: August 23, 2015, 09:49:49 pm »
gas in oil can be from a bad fuel pump diaphragm. if you let the truck sit for a couple days of so does it seam to take a couple more cranks than normal to start?
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

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Offline Don5

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Re: Any idea what kind of heads these are?
« Reply #12 on: August 23, 2015, 09:53:15 pm »
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It's been a LONG time since I have been called a newbie. Just sayin....

1979 GMC K15 355, SM 465, 205, 3.73 Dana 44 with a Spartan Locker, 12 bolt Eaton limited slip and 6 inch lift with 36 x 12.50 Super Swamper TSL's.

Offline enaberif

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Re: Any idea what kind of heads these are?
« Reply #13 on: August 23, 2015, 09:53:54 pm »
Quote from: Irish_Alley on August 23, 2015, 09:49:49 pm
gas in oil can be from a bad fuel pump diaphragm. if you let the truck sit for a couple days of so does it seam to take a couple more cranks than normal to start?

Gas in oil can also be from a leaky carburetor
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Offline c10dude75

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Re: Any idea what kind of heads these are?
« Reply #14 on: August 23, 2015, 11:51:12 pm »
Yeah got to pump the gas pedal 3 times then it starts. Kid I bought it from been doing that since he got it. also might have leaky carb cus there is what looks to be gas caught in the torker intake like might of been running down or flooded i don't know. And wouldn't 64cc create higher compression? And thanks for the link ill have to check that out. maybe ill take a pic up close of the carb so can see what's going on.
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