i am replacing the intake and valve gasgets on my 74 390. the lifter valley was full of what look like burnt sugar. the underside of the intake was coverd with it to.the motor has 72000 m. on it.is this bad? we have been fighting with used carbs foe the last week.one was dumping raw fuel into both barrels.
thanks guy
Newbie motor guy

 

That gunk is not uncommon. Clean it up real good. Change oil after you get it back together as a lot of stuff will get knocked loose. Is this the stock intake? It's a heavy one. Be sure to seal the front and back intake gaskets with a lot of sealer as they are prone to leak there. And make sure the bolt surface on the valve covers are flat as well. If stock valve covers are used they bend easy from over tightening and tend to leak as well.

 

thank you for the tips.i clean it up but good. not a spot left on it.i spent the whole day cleaning,sanding or wirewheeling everything i could get off the motor.now that i am this far in to it i am thinking about doing the cam. any one i should look at? R.V. is what iam using the truck for.

 

Yes a mild RV cam, timing chain and gears and a set of headers will wake it up real nice.

 

i see that you live in alaska. i will be up in Whitehores this summer, with my 74 s.c.s. thanks again for the help

 

Whitehorse is almost as far from me as Texas. Alaska is REALLY BIG.

 

Not that far just take the boat to Skagway then drive a couple of hours an your there ! done several times !

 

I would love that boat trip. Made it to Juneau, Sitka and that area lots of times. BUT can't even afford the gas to launch it and tie to the dock yet. And the skiff is only a 50 hp. I aint even gonna try ta get the 22 foot with the Windsor going this season. Aint noone got any money to charter it. And the last gas I bought was $3.65 a Gallon. Next week with the new fuel drop it will be $4.25. Time ta get a Kayak.

 

Lived in Juneau for 43 years and road the Alaska marine highway everywhere an it was cheap! Your lucky gas here in oregon is 3.85 an keeps going up!

 

It's $4.20 in Craig right now. I get mine from the Kasaan Village bulk plant. They buy 5000 Gallons at a time and sell it for just above cost. Like I said the next dump will be around $4.25. Still a lot cheaper than town (as it will be over $5.00 by then) but to damn much to try and run the boats. Life is a sunny beach than the tide comes in.