I have a small block 350 in my car. Based on casting #'s (3970010) and engine code (V0806TXB) the block is from 1975. The cylinder heads (333882) are 1.94 intake, 1.5 exhaust and match the block. I know that GM started making hardened valve seats for unleaded fuel in 1971 but the guy who built my engine had used CD-2 lead additive in the car before I got it. I have continued to use it but as I to do more research I do not think I need it. I don't know my compression ratio but I do not believe it is over 9.0:1. All that said, what are thoughts on running the lead additive? If I don't need it for the valve protection should I use it to boost my octane? If not should I start running 91 octane gas without the lead additive?
Fuel Octane and Lead Additive
- Thread starter VintageMonte
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I do not think CD-2 Lead substitute boosts octane.
As for your valves, valve seat ressesion tuned out to be a non issue for most engines and most people.
If you intend to run the car on a race track, you might see a problem
(IF the engine does not have hardened valve seats)
But for road use you won't have a problem.
As for your valves, valve seat ressesion tuned out to be a non issue for most engines and most people.
If you intend to run the car on a race track, you might see a problem
(IF the engine does not have hardened valve seats)
But for road use you won't have a problem.
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