Originally Posted by thefox
hello someone is trying to sell me SBC double hump 1969 z/28 heads complete 3370's are these any good and will they work good if i bolt them on my stock 1972 lt1 350 out of a vette the heads that are on it now are 882 heads witch im told they suck. just want some info before i buy them. he wants 250 for them
The 882 casting would not be original to a 1972 LT1, they are large chamber smog heads that were not production till 1974. These use a low compression 74 cc chamber but then again what should be there is also a low compression head.
The 3973370 is a 64 cc chambered part that was production in Canada but an over the counter factory hot rod part in the U.S. of A. They came in straight or angled plug; valve sizes can range 1.94/1.5 to 2.04/1.55. Ports are so-so; typical of the period. They will boost your compression which may or not have much effect depending upon whether you're running the larger LT1 cam that needs more compression to wake the motor up. The down side is the lack of hardened exhaust seats which will erode from the effects of no lead fuel.
$250 seems steep from a practical sense especially if they need rebuilding. Neither the 370 nor the 882 are period correct for the 72 LT1. But the 882 has the right size chamber as do the 487 and 916 heads which should be on an LT1 of that year both are large chamber heads. So the 882 is hardly crap compared to what the factory put there originally, but the 370 would put the compression up where an LT1 cam would like it. But if you have to spend $250 and rebuild them you'd be dollars and power ahead with Vortecs or their many aftermarket clones.
Back at that time and even today there are people enamored with the bigger valves that came in LT1 heads, but without more compression this is more BS for bench racers than anything that will get you down the track faster without more compression.