Is a 150 shot safe on a stock BBC?

[Blackroc]

A friend of mine from our local track is waiting for his race motor for his 442 to be finished. He has picked up a stock 455 around a 1976 and he wants to race me with my stock 454 with the peanut ports. He wants to go on the motors and then a 150 shot each. I have a good enough fuel system and know how much timing to take out.

[Dave Severson]

Nitrous is never completely "safe". Fuel enrichment can fail, timing can slip, or most anything could happen. But if all the components are there and working correctly, a 150 shot should be fine as long as the motor is in good shape and not allready half shot.

[Blackroc]

Thanks Dave, the motor hasn't had many miles on it since it was rebuilt. I will take 8 degrees of timing out and likely run a second pump for the fuel enrichment.

[Dave Severson]

Well, if everything is installed correctly and working properly, should be ok. Nitrous is not at all conducive to long engine life but when used at a moderate level, good fuel enrichment, and the correct timing it should be ok....

[billlsbird]

.....I ran nitrous on my '84 Camaro & for the fuel supply I put a Jaz 5 Gallon fuel cell up front where the battery was {I had the battery in the trunk}. And then put an electric fuel pump beside it so I just had a totally separate fuel source for the nitrous. I then put race fuel in the Jaz cell but since then I read somewhere that it wasn't good to mix race fuel & pump gas together like that.... oh & I had the timing retarded but I don't remember how much..... Don't do what I did & just keep putting bigger jets in though!! I had a 305 in it, it was fine w/ the 125 jets, fine w/ the 150 jets, ah but the 175 jets? KABOOM!!! No more motor!!!! A stock 305 isn't made for a 175 shot! Bill

[Dave Severson]

.....I ran nitrous on my '84 Camaro & for the fuel supply I put a Jaz 5 Gallon fuel cell up front where the battery was {I had the battery in the trunk}. And then put an electric fuel pump beside it so I just had a totally separate fuel source for the nitrous. I then put race fuel in the Jaz cell but since then I read somewhere that it wasn't good to mix race fuel & pump gas together like that.... oh & I had the timing retarded but I don't remember how much..... Don't do what I did & just keep putting bigger jets in though!! I had a 305 in it, it was fine w/ the 125 jets, fine w/ the 150 jets, ah but the 175 jets? KABOOM!!! No more motor!!!! A stock 305 isn't made for a 175 shot! Bill

Yup, if a small shot is a little bit of fun, then a bigger shot must me more fun, right????? In the pursuit of scientific investigation, we determined a 250 hp shot on a stock 302 with 80,000 miles was a bit much!!!! But man, was it a great explosion, even took the starter off the side of the block!!!!! I'd bought the car for the body, didn't need the engine, and decided to have a bit of fun....