Small block ID

[Truckman4life]

I'm helping my father in law with an engine out of an old boat. It froze and was getting water in the oil. He pulled it out. He picked up a 70s blazer that supposedly had a good engine. It was locked up. He pulled it also. We tore them down this weekend. The blazer engine is a 350 and had 2 pistons rusted in place but otherwise really good shape. I messed up those pistons/rods driving them out. Casting number shows '75 and its a 4 bolt main. I'm hoping I can hone it and do a re-ring.

The boat engine is a 2 bolt main. Broken block. Hoping to use the 4 bolt block with the heads and other parts from the boat motor. Its a Volvo Penta. Can't find any info from its casting number. Maybe @ryoken knows. Just want to make sure they're compatible and which stuff is the better stuff to go with. I've heard the boat heads would be better. Not sure on cams, pistons look similar.

 

[Wes Harden]

that 4 bolt got a forged crank ?

 

[Truckman4life]

that 4 bolt got a forged crank ?

No idea! That's what I need to know, which parts are the best to try to use in that block.
Gotta finish blowing both of them all the way apart then clean parts and evaluate.

 

[Wes Harden]

smack a counter balance with a small ballpeen if rings like a bell it's forged, if it's a dull clank it's cast. Can also tell by the part seam.

 

[HankScorpio]

I helped swap a 350 into a boat, it had a small block of some kind originally. We had an automotive long block to swap into it. We had to drill through the outside of the heads into a water passage to make all the boat cooling stuff work properly. We just measured the old heads as a template.

 

[ZooMad75]

The TYZ suffix code comes back to 1975,76,77 350 that had a 4bbl with an auto trans and it was from a truck.

That won’t say if it’s got a forged or cast crank.

As far as compatibility goes as long as they are both gen 1 small blocks everything will swap. You could snag the casting numbers off the heads to truly see when ones are better. The original 350 being from the mid 70’s would have some relatively crappy heads given the smog era the came from. Small blocks used in boats typically didn’t have the same emissions that a car or truck did back then. Meaning the boat engine might have a better head, but I doubt it. The casting numbers would flesh that out pretty quickly.

Checking the casting number on the other block is being 4010207 as I read it doesn’t come up on most of the casting list websites. 14010207 comes back to an 80’s truck 350. Some of my Google searches came back to the number without the 1 at the front being a possible 305. But no list confirmed the number without the 1 up front.

I only bring this up if the boat engine is a 305 the heads while physically capable of bolting onto a 350 they would have smaller valves and port sizing.

Key thing would be to run the casting numbers of the heads to ID them to confirm what the are and which if either is better.

 

[Truckman4life]

The TYZ suffix code comes back to 1975,76,77 350 that had a 4bbl with an auto trans and it was from a truck.

That won’t say if it’s got a forged or cast crank.

As far as compatibility goes as long as they are both gen 1 small blocks everything will swap. You could snag the casting numbers off the heads to truly see when ones are better. The original 350 being from the mid 70’s would have some relatively crappy heads given the smog era the came from. Small blocks used in boats typically didn’t have the same emissions that a car or truck did back then. Meaning the boat engine might have a better head, but I doubt it. The casting numbers would flesh that out pretty quickly.

Checking the casting number on the other block is being 4010207 as I read it doesn’t come up on most of the casting list websites. 14010207 comes back to an 80’s truck 350. Some of my Google searches came back to the number without the 1 at the front being a possible 305. But no list confirmed the number without the 1 up front.

I only bring this up if the boat engine is a 305 the heads while physically capable of bolting onto a 350 they would have smaller valves and port sizing.

Key thing would be to run the casting numbers of the heads to ID them to confirm what the are and which if either is better.

More pics. First 4 boat. Last 2 truck engine. Boat engine has flat top pistons. Truck ones are dished.

 

[Wes Harden]

All crappy heads. 624 a copy 882, weak crack prone. Can have multiple sizes of vavles.
74-76 combustion chamber.

Eng with dish and 624 heads had low low compression

Edit: also these are light weight castings

 

[imiceman44]

All crappy heads. 624 a copy 882, weak crack prone. Can have multiple sizes of vavles.
74-76 combustion chamber.

Eng with dish and 624 heads had low low compression

Edit: also these are light weight castings

You beat me to it.
I have scrapped a few of those