8.1L/496 BBC Vortech
4 posters
G3GM :: G3 Tech :: Engine & Driveline
Page 1 of 1
8.1L/496 BBC Vortech
Hope someone can help me. I am looking at a 2000 8.1/496 Vortech motor possibly for my '76 Laguna S3. I have done quite a few Gen IV 396/427/454's over the years, just wondering about the differences between those and this newer generation?
It is a local CL ad, supposedly a complete motor with computer, torn down ready for a freshening up.
Anyone know of any good documentation on this newer generation? I have a few of the older books on the Gen IV's.
It is a local CL ad, supposedly a complete motor with computer, torn down ready for a freshening up.
Anyone know of any good documentation on this newer generation? I have a few of the older books on the Gen IV's.
BAS-Sr- G3GM Member
- Street Cred : 1
Re: 8.1L/496 BBC Vortech
Probably best to stay away from it. Very little if anything interchanges with the previous generations. Head bolt location, firing order is different just to name a few. Intakes and heads are totally different. Those engines are a cross breed between an LS style motor and a standard big block. they do look very similar on the outside though.
If you can find a gen 6 454, that would be the one to get. All the main caps are 4-bolts, one piece seals, roller cam. The factory heads are not very desirable. Earlier generation heads will fit with the proper head gasket. I am in the process of helping a friend assemble one. Very nice motors. No fuel pump mount if you plan on running a carb. I will be going with a gen 6 when my current 454 gets tired.
If you can find a gen 6 454, that would be the one to get. All the main caps are 4-bolts, one piece seals, roller cam. The factory heads are not very desirable. Earlier generation heads will fit with the proper head gasket. I am in the process of helping a friend assemble one. Very nice motors. No fuel pump mount if you plan on running a carb. I will be going with a gen 6 when my current 454 gets tired.
73ss- G3GM Enthusiast
- Street Cred : 11
Re: 8.1L/496 BBC Vortech
Fun reads. I think you will find it more trouble than it's worth. On the other hand, you could pull a camper.
http://www.hotrod.com/articles/gm-vortec-8100-the-454s-forgotten-big-brother/
http://www.raylarengineering.com/vortec-8100-496cid-truck-performance-parts.html
http://www.hotrod.com/articles/gm-vortec-8100-the-454s-forgotten-big-brother/
http://www.raylarengineering.com/vortec-8100-496cid-truck-performance-parts.html
REVINKEVIN / Mr. 600+HP- G3GM Senior Member
- Street Cred : 19
Re: 8.1L/496 BBC Vortech
It is a great engine - in a truck. Very little aftermarket support (read expensive) and limited. The stock computer has torque management programed into it so you can keep the rear tires on the truck. It is actually a metric tall deck so nothing except valve covers or oil pan will interchange, basically an LS Big Block.
One heck of an engine for towing, 10,000# on the hitch feels like nothing, has no power over 4500 RPM but will smoke the tires at will. As mentioned above, go with a Gen VI - still a basic 454 with a better oiling system than a Mark IV, will accept Mark IV heads with a FelPro 1037 head gasket. Also has the provisions for factory roller cam, or can use an old flat tappet. The blocks in demand are the crate engine blocks because they have a fuel pump pad, the ones used in the trucks did not even have the fuel pump pad pored with the block so you have no choice but electric fuel pump.
I am building a Gen VI with the Vortec heads for my 1978 C20 Camper Special, using a 454 HO cam. Vortec heads are good for torque, but are not performance heads, but any aftermarket head and all stock heads will bolt up (you can interchange Gen V and Gen VI head on Gen V and Gen VI blocks, but you cannot put Mark IV heads on a Gen V block).
One heck of an engine for towing, 10,000# on the hitch feels like nothing, has no power over 4500 RPM but will smoke the tires at will. As mentioned above, go with a Gen VI - still a basic 454 with a better oiling system than a Mark IV, will accept Mark IV heads with a FelPro 1037 head gasket. Also has the provisions for factory roller cam, or can use an old flat tappet. The blocks in demand are the crate engine blocks because they have a fuel pump pad, the ones used in the trucks did not even have the fuel pump pad pored with the block so you have no choice but electric fuel pump.
I am building a Gen VI with the Vortec heads for my 1978 C20 Camper Special, using a 454 HO cam. Vortec heads are good for torque, but are not performance heads, but any aftermarket head and all stock heads will bolt up (you can interchange Gen V and Gen VI head on Gen V and Gen VI blocks, but you cannot put Mark IV heads on a Gen V block).
Iggy- G3GM Member
- Street Cred : 15
Re: 8.1L/496 BBC Vortech
Thanks, exactly what I wanted to know!
I'll stick with a 454!
I'll stick with a 454!
BAS-Sr- G3GM Member
- Street Cred : 1
G3GM :: G3 Tech :: Engine & Driveline
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum
|
|
Yesterday at 7:25 pm by 77camino
» 77 elco SS
Tue Mar 26, 2024 4:35 pm by Whisperer
» 3-g cars in Finland
Tue Mar 26, 2024 11:33 am by Finn Monte
» Stainless brake lines
Mon Mar 25, 2024 4:37 pm by Joe73
» New chassis for my 73
Sun Mar 24, 2024 9:39 pm by g3chevy / Mr Pontiac
» 1973 Chevelle SS, 350, 4spd. build
Fri Mar 22, 2024 4:21 pm by Joe73
» Rusty's progress Hood sorta Finalized and other Updates
Thu Mar 21, 2024 4:58 pm by Limey SE
» cluster metal trim
Thu Mar 21, 2024 10:23 am by Joe73
» Nos wheel well moldings
Wed Mar 20, 2024 3:33 pm by Limey SE
» Dash assembly for 73-77 Malibu/Monte/El Camino,etc.
Wed Mar 20, 2024 11:26 am by Limey SE