I'm picking up a 4-bolt main truck block on monday that was a factory roller cam block and has a one-piece rear main seal. This is totally interchangeable with the block that's currently in my 89 IROC-Z right?

 

Yes it should be a direct swap as far as the block goes.

Jason

 

Sensor ports and accessory bracket holes and all right?

 

Yes, the oil pressure and knock sensor ports should still be there, but if you're going from a 305 to a 350 you'll need a different knock sensor. The bracket holes should be there too.

The Gen II small blocks are the same except for the bore offered.

Jason

 

Thanks. I already got my 350 knock sensor so I should be set as long as I don't put a hole in this block too.


------------------
Riccioli Performance Motorworks

--RPM Racing--

-Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, AFR 190 heads, MSD ignition.
-Will be installing Baer Brakes
-Will be installing full Spohn suspension in rear
-Art Carr 700R4 trans??


Attention Everyone!!! I will be changing my name on the message boards to HardcoreZ28 sometime in the near future. Just wanted to let everyone know.

 

That one looks great Paul.


The GENII small blocks were of the LT1/LT4 designation (92-97) and there are actually a few differences, but the bore was the same except for the 4.3L V-8 (yes V-8) that was in a few Caprices that had a small bore.

------------------
-Joseph
ASE Master Automobile Technician
Scoggin-Dickey Chevrolet

1967 Camaro (Vortec Heads, GM ZZ4 intake manifold, ZZ4 roller camshaft)
1992 Firebird (Weiler Vortec Heads, LT4 Hot Cam, GM ZZ4 Intake, Edelbrock 750, eventually will be Ram-Jet)

 

there was also a 4.3 V8 back in the day, some guy tried to sell me an 81 cutlas or soemthin with one...what a dog...i believe it's a 262 or something

 

It was a 267...Kevin

 

Sorry, by Gen II I meant the new 87+ roller blocks w/ 1 piece rear main seals. I know the Gen IIIs are the new LS1 blocks, and I guess I forgot that Gen IIs are LT1 blocks.

When I said Gen II I meant the new 87+ roller blocks w/ 1 piece rear mains.

Sorry for the confusion,

Jason