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Old 01-02-2007, 08:07 PM
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pontiac engine ID

I just bought a 1968 firebird. It has the 350 hood and Im trying to id the engine. I found a stamp on the right side of the engine below the head. PXN. I also found a id # to the left of the timing cover 28l141143. My heads are marked 01. I think these are junk 301 heads from the 70"s. I'm hoping that the block is not a 301.Can you use 301 heads on a 350? Any help will be greatly appreciated.

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Old 01-02-2007, 08:44 PM
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301 150 Hp Px4,px6,pxl,pxn
Not being smart, only honest, 301`s make good boat anchors, that`s about all there good for.
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Old 01-02-2007, 09:11 PM
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thanks man, I'm really disapointed

Ya I would have to agree with you. I'll have to start looking for another engine.
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Old 01-02-2007, 09:12 PM
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Where did you come up with your info?
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Old 01-02-2007, 09:41 PM
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Pontiac Heads

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Originally Posted by kelly4goons@hotmail.
I just bought a 1968 firebird. It has the 350 hood and Im trying to id the engine. I found a stamp on the right side of the engine below the head. PXN. I also found a id # to the left of the timing cover 28l141143. My heads are marked 01. I think these are junk 301 heads from the 70"s. I'm hoping that the block is not a 301.Can you use 301 heads on a 350? Any help will be greatly appreciated.
A good head for a pontiac 350 was the #48 series. You can get very good results from a 6x or 4x head. I have 6x heads on a blown 428 pontiac and 6x heads on a 455 built to super duty specs which's runs 12.01 in the quarter mile in a 1969 pontiac grand prix. You can get these heads all over cheap. But I agree replace the 301 parts.
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Old 01-03-2007, 06:56 AM
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http://www.pontiacracing.net/engine1.htm
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Old 01-03-2007, 12:20 PM
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I think the casting numbers on a lot of pontiacs were on the back top near the tranny.

Last edited by vettedreams2001; 01-03-2007 at 12:28 PM.
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Old 01-03-2007, 09:11 PM
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If it has 301 heads, it's a 301 engine. The intake won't fit on anything else.
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Old 01-12-2007, 07:16 PM
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Head I.d.

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Originally Posted by vettedreams2001
I think the casting numbers on a lot of pontiacs were on the back top near the tranny.
THEIR IS A CASTING NUMBER IN THE MIDDLE OF THE HEAD OBSERVED ABOVE THE EXHAUST MANIFOLD AREA. EXAMPLE MARKINGS..6X,4X,670,13,16,6H ETC. USUALLY THE CASTING SIZE IS ABOUT 5/8 INCH IN SIZE. SOMETIMES IF YOU HAVE HEAT SHIELDS FOR THE HEAT RISERS TO THE AIR CLEANER THEY WILL BLOCK THIS VIEWABLE NUMBER.
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Old 01-12-2007, 10:02 PM
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Quote:
Originally Posted by JDG 38 pontiac
A good head for a pontiac 350 was the #48 series. You can get very good results from a 6x or 4x head. I have 6x heads on a blown 428 pontiac and 6x heads on a 455 built to super duty specs which's runs 12.01 in the quarter mile in a 1969 pontiac grand prix. You can get these heads all over cheap. But I agree replace the 301 parts.

6x heads have a reputation for being a great flowing head, pontiac guys are always drooling over them, but I wouldn't say they're all over and I wouldn't say they're cheap. 5c heads are the same casting but with hardened seats for unleaded fuel. they are as common as mud and few people realized they are the same as a 6x. not to go off on a tangent here, but it might be something to keep in mind if you're looking for heads.
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Old 01-14-2007, 04:32 PM
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heads

Thanks wyomingoutlaw thats good info to know..I'll watch for those numbers when I'm digging thru the junk yard.
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Old 01-14-2007, 10:36 PM
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GM heads from about '72 on had induction-hardened exhaust valve seats. If you're looking around for Pontiac heads, there's some good info at http://pontiacstreetperformance.com/...harticles.html (scroll down about halfway)
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Old 04-27-2008, 06:37 PM
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1969 engine/trans

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Originally Posted by kelly4goons@hotmail.
Ya I would have to agree with you. I'll have to start looking for another engine.
HI JUST PULL A ENGINE AND TRANSMISSION, AN IS FOR SALE
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