350 timing

[skid]

Anyone else have a carbed 350 in their jet boat? If so whats your timing set at?

 

[gunner3006]

28 deg

 

[skid]

And that was at 3000rpm or when you were at full throttle?

 

[gunner3006]

And that was at 3000rpm or when you were at full throttle?

That was from idle up to 2800 I believe.

 

[NoBrakes!]

32 is safe on 91 pump IMO. 38 if you're on LL 100 and jet for it!

make sure the advance is all in, either disconnect and plug vacuum or rev to 3500ish

 

[skid]

Thanks guys, going to hit the lake one night this week and bring the timing light with me. I have a quadrajet 4 barrel carb on it and when I reinstalled the carb on the intake the gasket was torn so I replaced it but the old one was fairly thick, about 1/4” and no one in town had that thickness so I needed up using the thinner gasket they had. Is the thicker gasket specific for marine?

 

[S.W.A.T.]

More problems Steve? Is the gasket universal between 350s specific to the carb?

 

[skid]

No I just dropped a new long block in it and that particular gasket needed replacing, lordco had never seen the thicker style but had a thinner one in stock which I installed. I did some searching and it looks like it’s for insulating it from heat from the intake. I used intake gaskets with the exhaust cross over ports fully blocked so my intake doesn’t get as hot so I should be good with the thinner gasket. Runs like a champ now.

 

[mur190]

run my zz4 on prem at 32 degrees, if I was on 87 oct it would be 28.

 

[mur190]

I ordered a plastic composite deal off amazon that measures about 3/8' thick, and thin gasket on either side, i dont have much clearance between my sun deck and filter otherwise i would have went thicker... similar to the link below.

https://www.amazon.ca/Edelbrock-926...hevrolet+carb+insulator&qid=1589497848&sr=8-1

No I just dropped a new long block in it and that particular gasket needed replacing, lordco had never seen the thicker style but had a thinner one in stock which I installed. I did some searching and it looks like it’s for insulating it from heat from the intake. I used intake gaskets with the exhaust cross over ports fully blocked so my intake doesn’t get as hot so I should be good with the thinner gasket. Runs like a champ now.

 

[skid]

Hmmm ok I’ll look into that, my gasket is a bit different in shape, it’s a quadrajet carb. I’ll see what I can find, but I’ll see how she does on the ocean this next weekend. Thanks mur

 

[NoBrakes!]

I would think with the constant throttle, you wouldn't worry about the heat transfer. my intake is ice cold most of the time, the spacer sweats on the outside.

 

[ABMax24]

I would think with the constant throttle, you wouldn't worry about the heat transfer. my intake is ice cold most of the time, the spacer sweats on the outside.

The issue isn't during operation, it's when the engine is shutoff for a while giving the carb a chance to heat soak, it seems to boil the fuel out of the carb making restarts difficult at times. My dad has a Ford 302 lake boat like this, on warm day with a warm engine you have to pump the throttle a few times to get enough fuel in it to start.

 

[gunner3006]

The issue isn't during operation, it's when the engine is shutoff for a while giving the carb a chance to heat soak, it seems to boil the fuel out of the carb making restarts difficult at times. My dad has a Ford 302 lake boat like this, on warm day with a warm engine you have to pump the throttle a few times to get enough fuel in it to start.

Hard on the starter too. My 305 was the same way.

 

[NoBrakes!]

Tunnel ram baby! problem solved