Heads
Drifting
Joined: Nov 2002
Posts: 1,665
Likes: 1
From: Ontario
According to this site
http://www.stingray.nu/tips/tech80.htm
both engines had the same head casting number of 462624.
This site here
http://www.chevytalk.com/tech/engine/SBC_Heads.html
has this to say about this casting number.
"624" – 462624, 426624, or 458624. The 458624 was a truck head, with 1.72/1.50 valves – non performance. The other castings were used mid 70's and up on 350 engines, they came with 1.94/1.50" or 2.02/1.60" valves, had 76CC combustion chambers, DO have accessory holes, intake port volume is 161CC's, exhaust port volume is 62CC's. These heads are made of thinner castings and are prone to cracking.
http://www.stingray.nu/tips/tech80.htm
both engines had the same head casting number of 462624.
This site here
http://www.chevytalk.com/tech/engine/SBC_Heads.html
has this to say about this casting number.
"624" – 462624, 426624, or 458624. The 458624 was a truck head, with 1.72/1.50 valves – non performance. The other castings were used mid 70's and up on 350 engines, they came with 1.94/1.50" or 2.02/1.60" valves, had 76CC combustion chambers, DO have accessory holes, intake port volume is 161CC's, exhaust port volume is 62CC's. These heads are made of thinner castings and are prone to cracking.
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
The L82 will flow better due to the bigger valves. But they are large chamber 76cc smog heads. If you can afford to, a head swap WILL give you the desired bang for your buck.
