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Old January 9th, 2009, 01:57 PM   #1 (permalink)
Cardinal
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350 SB Heads

I'm just getting back into something I think is fun. I got a 73 350 #8 heads cheap. Run of the mill stuff. I want to bring it back a little better than when it was built. Would a set of 5A heads be something to consider as a start to increase comp (.93 increase) flat top pistons, mild cam. I'm looking for 300 hp in the end.

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Old January 9th, 2009, 03:27 PM   #2 (permalink)
dan2286
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Are you talking about 5A heads from a 307 or 5 heads from a 350?
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Old January 10th, 2009, 05:46 AM   #3 (permalink)
Cardinal
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At this time its 5A heads from a 80's 307. I am in to advice. I saw some on Ebay and was just wondering.
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Old January 10th, 2009, 05:59 AM   #4 (permalink)
Cardinal
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Just a little more info. The VIN derivitive on the block is 33W134707. The "W" is confusing to me. A realiable source sugests the "W" is a miss aligned "M" . I have never seen a "M" so I don't know what it looks like upside down. The oil filler tube is 3864688 may not be orig. crank is 393654 (74) and the julian date code is 172, so I'm thinking late 73 early 74.
I do think this site is a MUST for anyone who into anything Olds
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Old January 10th, 2009, 08:29 AM   #5 (permalink)
joe_padavano
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Quote:
Originally Posted by Cardinal View Post
Just a little more info. The VIN derivitive on the block is 33W134707. The "W" is confusing to me. A realiable source sugests the "W" is a miss aligned "M" . I have never seen a "M" so I don't know what it looks like upside down. The oil filler tube is 3864688 may not be orig. crank is 393654 (74) and the julian date code is 172, so I'm thinking late 73 early 74.
I do think this site is a MUST for anyone who into anything Olds
The second "3" in the VIN derivative also indicates the 1973 model year. The "M" used in the VIN derivative stamp has parallel sides, so if it really is an upside down "M", the outboard legs will be parallel. A "W" has outboard legs that are splayed.
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Old January 10th, 2009, 08:45 AM   #6 (permalink)
J-(Chicago)
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5A heads from a 307 have 1/2'' bolts
#8's have 7/16''
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Old January 10th, 2009, 12:14 PM   #7 (permalink)
Cardinal
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The legs are definatly splayed so a Willow Run station wagon engine?
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