lead substitute

[pjm8047]

Im add lead substitute in my gas at every fill up in my 71 roadrunner 383. I was wondering if I have to add lead substitute to my gas or if i car run it without it and run it with just the enthonl additive. the engine has 34,000 miles never been pulled out.

 

[blackblazer717]

Always run lead substitute, youll kill the valve seats if you dont

 

[lewtot184]

basically the marketed "lead substitutes" don't work and there isn't any real substitute for tetra ethyl lead. ethanol is a non-lubricant and lead was a valve seat lubricant.

 

[pjm8047]

Yeah thats what I thought. I add it at every fill up. I was just wonder what year chrysler switched over to unleaded gas?

 

[blackblazer717]

74-75ishh??????? Cant remember

 

[pjm8047]

i use cd-2 lead sub and its almost done. I cant find it anywhere. Whats a good replacement?

 

[blackblazer717]

i use cd-2 lead sub and its almost done. I cant find it anywhere. Whats a good replacement?

Thats good stuff!!! I always get it at Advance Autoparts. Last time i needed it they didnt hace any in stock, so i ordered a case from them

 

[Histoy]

I used to buy the CD-2 lead sub at the Farm and Fleet store.

 

[69Bee]

Snake-oil in a can. Just put hard exhaust seats the the heads, and install chrome stem valves. You probably have spent more than the cost of the job in additives already.

 

[Mesopic]

I run broquet fuel catalyst and just regular unleaded fuel. Never had any trouble. Fuel catalyst means you don't need to add lead also means you can advance the timing a bit. Ethanol is only meant for rental cars.

 

[Erike]

Get a set of 906's done with hardened seats. You will be money ahead in the long run. Maybe even a set of 452's for the wreaking yard.

 

[Ron 73]

74-75ishh??????? Cant remember

I really don't know what year, But the block in my car is the original (73) but i found my heads are 1975, Ive been thinking being the guy that rebuilt this maybe that is the reason for the heads being swapped.. Im just guessing...