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Old 09-21-2003, 08:20 PM
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Pontiac 400 heads

I am looking for information on how to tell the difference between a 1970 gto #13 head ( 350 hp) from a 1970 Firebird #13 head( 330hp). The date stamped on the head is H049, this should mean it is a 1969, but with the #13 stamped in the center ports it must be from a 1970 Firebird or GTO. Im gettin confused with all the number research and am starting to go crossed eyed searching the net. HELP!

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Old 09-21-2003, 10:33 PM
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Try www.wallaceracing.com John has a great list of head codes for you.
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Old 09-22-2003, 09:40 PM
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Thanks, I checked it out and now see its the cc's. Now i just got to pull them off and figure it out. By the way, what are a set of these heads worth?
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Old 09-23-2003, 07:33 PM
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Even though you checked out the site, they are the same heads, the reason the Firebird has a lower horsepower rating is due to the weight difference between the F-body and A-body. Both heads should be between 72-75 cc's and both could be had with the standard 400 and the Ram Air III, and could be found primarily on automatic equipped vehicles.
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