mostwanted
1/2 ton status
Would the center bolt heads on my rig be vortech? If so are the rocker arms and stuff be the same as any other GM head?
CK5
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center bolt heads
- Thread starter mostwanted
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Jason4x4
1/2 ton status
the vortec heads only have 4 bolt holes on each head for the intake, if it has 6 holes for the intake, they aren't vortec heads.
mostwanted
1/2 ton status
what about the intake ports? A friend of mine said vortechs are oval.
big blocks maybe, but not gen 2 small blocks, they are still rectangular. And the Vortecs take the self aligning rocker type set up, and just because they are centerbolt doesn't mean they are vortec. The vortecs came in 96 up applications.
mostwanted
1/2 ton status
76zimmer said:
that's what I needed to know. I know I either need head work or have bad rings as I am loosing compression on 1 cylnder. If I am going to tear into it, then I want to build it the way I want. Planning on Vortech heads with a comp cam XE262H grind cam.
sled_dog
1 ton status
76zimmer said:
vortec engines are still considered gen I
thedrip
1/2 ton status
LT1 is gen II... but vortec is gen I. Optispark and reverse flow cooling are whats real different about the gen II from the late gen I's.
The LT1 has been around since the 70's, i think you're confusing it for the LS1.
thedrip
1/2 ton status
no, there is a 'new' LT1. used in b-body 94-96, camaro/firebird 93-97, vette 92-96. Called the Gen II smallblock. LS1/LS2/LS6 and the truck 4.8/5.3/6.0 are gen III.
Trucks/vans never got Gen II motors. Vans were gen I until '02 or 03.
Trucks/vans never got Gen II motors. Vans were gen I until '02 or 03.
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sled_dog
1 ton status
4X4HIGH said:
The LT1 in reference here is the 92+ Vette/Camaro/Caprice multiport engine. Come on, you know that.
LSx engines are Gen III engines.
thedrip
1/2 ton status
Digging further back in my memory... I pulled this little tidbit out of... well... the far reaches of the back of my head... the 70's engine you were referring to was actually monikered the "LT-1" while the gen II is actually "LT1"
mostwanted
1/2 ton status
sled_dog
1 ton status
no 94, is TBI engine, not vortec. Vortec started in 96 for v8s.
mostwanted
1/2 ton status
ok thank you.
blazin_blazer
1/2 ton status
true but....
......in 96 the vortec was an option so all '96 models aren't vortec. regular tbi motor was standard, vortec was optional motor in 96...vortec was standard in 97!
sled_dog said:
......in 96 the vortec was an option so all '96 models aren't vortec. regular tbi motor was standard, vortec was optional motor in 96...vortec was standard in 97!
I'm not sure where your info came from but everything i know of says 1996 was vortec. The last regular TBI was 1995
blazin_blazer
1/2 ton status
i know this because i have a 96 tahoe with a vortec and i also have the window sticker of said vehicle that shows the vortec as an option and also have a friend with a 96 that his dad bought new as a base model and it has a regular tbi in it
1996 - This was the last change for the Generation I engine, and continued through the end of the production run in 2003; all 1997-2003 Generation I engines were Vortec truck engines. The cylinder heads were redesigned using improved ports and combustion chambers similar to those in the Generation II LT1. This change resulted in significant power increases.
it says all 97-2003 because in 96 tbi or vortec was available
1996 - This was the last change for the Generation I engine, and continued through the end of the production run in 2003; all 1997-2003 Generation I engines were Vortec truck engines. The cylinder heads were redesigned using improved ports and combustion chambers similar to those in the Generation II LT1. This change resulted in significant power increases.
it says all 97-2003 because in 96 tbi or vortec was available
blazin_blazer
1/2 ton status
TBI L31 applications
1996 G-series Vans over 8,500 GVW w/ 4L80E\
1996 General Motors C/K full-size trucks
1996 Chevrolet Suburban/GMC Yukon XL full-size long-wheelbase SUVs
1996 Chevrolet Tahoe/GMC Yukon full-size short-wheelbase SUVs
L31 applications:
1996 G-series Vans over 8,500 GVW w/ 4L80E\
1996 General Motors C/K full-size trucks
1996 Chevrolet Suburban/GMC Yukon XL full-size long-wheelbase SUVs
1996 Chevrolet Tahoe/GMC Yukon full-size short-wheelbase SUVs
L31 applications:
- 1996-2003 Chevrolet Express/GMC Savana full-size vans
- 1996-1998 General Motors C/K full-size trucks
- 1996-1999 Chevrolet Suburban/GMC Yukon XL full-size long-wheelbase SUVs
- 1996-1999 Chevrolet Tahoe/GMC Yukon full-size short-wheelbase SUVs
- 1999-2000 Cadillac Escalade
Here are the specs from GM for '96 vehicles:
http://media.gm.com/division/chevrolet/products/archive_prod_info/pguide/chevpgde.htm
GM specifies nothing but Sequential Fuel Injection for the C/K or 2/4dr Tahoe's for gas engines.
I know the TBI Vortec SBC GenI intake being sold is a genuine production piece, only thing I've ever heard that used on was the vans for one year.
http://media.gm.com/division/chevrolet/products/archive_prod_info/pguide/chevpgde.htm
GM specifies nothing but Sequential Fuel Injection for the C/K or 2/4dr Tahoe's for gas engines.
I know the TBI Vortec SBC GenI intake being sold is a genuine production piece, only thing I've ever heard that used on was the vans for one year.
