LT1 Heads 12551561b

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LT1 Heads 12551561b

Post by hodos » Mon Dec 02, 2019 1:39 pm

I recently purchased a 94 Firehawk and was wondering about these heads. I can't find much mention on the ethers of the internet about the significance of the "B" on these heads. Does anyone know? Are they specific to firehawks? I have a 97 camaro that has 12551561 heads, without the B. It seems weird that an engine 3 years older would have a revised head casting #. Any help that anyone could provide would be appreciated.


8 is enough
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Re: LT1 Heads 12551561b

Post by 8 is enough » Thu Dec 05, 2019 9:13 pm

Not sure about the casting numbers, but the engines in 2004 firehawks were stock LT1’s. There were no engine modifications. Just the intake airbox, and cat-back exhaust if equipped.
1994 Yellow Firehawk Trans am Pilot Car #003

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Re: LT1 Heads 12551561b

Post by lakeratiam » Fri Dec 06, 2019 3:27 pm

There were only very minor casting differences in the 2nd generation lt1 heads...... '92 - '97 and they all had the same size valves and runners. The Lt4 heads had the runner raised just a bit compared to the lt1 heads. The only real difference was the B body cars with the Lt1 had iron heads instead of aluminum.
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