TubeTruck
I'm from Boston. Deal with it.
- Joined
- Sep 4, 2019
- Posts
- 1,439
- Reaction score
- 2,180
- Location
- East TN
- First Name
- Denis
- Truck Year
- 1978
- Truck Model
- Suburban K10
- Engine Size
- LQ9
My Suburban currently has a 400 small block in it. From what I've been told is it was rebuilt in 2000 and the PO just used it to tow his boat after that. It runs rough, but it runs. I know one cylinder has leaky valve seals, possibly a bad valve in that cylinder. It leaks oil from both ends, the valve covers, and coolant from the thermo housing. I'm guessing it was bored over, probably .030. If it was rebuilt in 2000, figuring on the small end, 5k miles a year, that's almost 100k on the motor. It has head casting #458642 which are 1.72/1.50 valve 76cc chamber crack prone smog heads.
In my '75 I have a 350 small block. Runs good, feels pretty strong. No idea on age, rebuilds, or originality. It doesn't leak. It has head casting #333882, which have 1.94/1.5 valves and are also 76cc chamber crack prone smog heads but supposedly they flow good.
Keep in mind that eventually I want a big block in this truck so this is going to be a "budget" rebuild that needs to last a few years. I have a few scenarios that I could come up with.
Scenario #1
Swap the 400 with the 350 and call it a day, maybe install a cam, intake and carb. Sell the 400 and use the cash for a big block.
Scenario #2
Replace leaking gaskets and hope the 400 holds up for a while, sell the 350 and use that cash towards a big block.
Scenario #3
Take the heads off the 350, make modifications to put them on the 400, new gaskets, truck cam, intake and carb.
What do you guys think? I don't have a lot of cash on hand. I'm kind of able to use cash when it's available, probably a few hundred a month. Currently looking for ways to make extra cash for my projects. Big blocks around here go for $750+ for a stock core with no accessories. I can get a freshly pulled motor off eBay for around $1k and free delivery but they have 2-300k miles on them.
In my '75 I have a 350 small block. Runs good, feels pretty strong. No idea on age, rebuilds, or originality. It doesn't leak. It has head casting #333882, which have 1.94/1.5 valves and are also 76cc chamber crack prone smog heads but supposedly they flow good.
Keep in mind that eventually I want a big block in this truck so this is going to be a "budget" rebuild that needs to last a few years. I have a few scenarios that I could come up with.
Scenario #1
Swap the 400 with the 350 and call it a day, maybe install a cam, intake and carb. Sell the 400 and use the cash for a big block.
Scenario #2
Replace leaking gaskets and hope the 400 holds up for a while, sell the 350 and use that cash towards a big block.
Scenario #3
Take the heads off the 350, make modifications to put them on the 400, new gaskets, truck cam, intake and carb.
What do you guys think? I don't have a lot of cash on hand. I'm kind of able to use cash when it's available, probably a few hundred a month. Currently looking for ways to make extra cash for my projects. Big blocks around here go for $750+ for a stock core with no accessories. I can get a freshly pulled motor off eBay for around $1k and free delivery but they have 2-300k miles on them.