305 VORTEC ??????
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Car: 91 R/S , 89 dodge p/u
Engine: L31 GM crate re-cammed , 318
Transmission: T-5 , 4 speed auto
Axle/Gears: 3.42 , ?
305 VORTEC ??????
a friend bought a 1998 Z71 with a blown engine . since I had just installed a L31 Vortec in my Camaro he asked a few things about Vortec's . I looked at it and said sure enough it's a 350 Vortec . well yesterday got old engine pulled , scrapped crud away found engine was a 5.0 (305) . I said WTF , all outward appearance (heads) say Vortec . today I pulled a valve cover to look at numbers . cylinder head number 12552520 . put replacement eng. (from a newer J/Y truck) in today . newer 5.7 eng. has 906 heads as does my L31 GM crate . all I mean ALL , outward appearance on both engines are identical . oh yes , blown eng. (305) also has an 8" harmonic balancer . my question is WTF is the old engine . was there a 305 Vortec ???
#3
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Re: 305 VORTEC ??????
Yeah, and it wasn't anywhere near as good as it's 350 Vortec big brother.
But just think how happy you're going to be when you step through on 45ci more displacement fed by the far-superior 350 Votec heads (that are radically better than the 305 Vortec heads)!
But just think how happy you're going to be when you step through on 45ci more displacement fed by the far-superior 350 Votec heads (that are radically better than the 305 Vortec heads)!
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Car: 1988 Camaro
Engine: 355, 10.34:1, 249/252 @.050", IK200
Transmission: TH-400, 3500 stall 9.5" converter
Axle/Gears: Ford 9", detroit locker, 3.89 gears
Re: 305 VORTEC ??????
Yep made them in '96-98 IIRC, used only in trucks/vans/suvs. L30 was the RPO code.
It's a "vortec" 305. 9.1:1 compression, roller cam, "vortec" heads, but nothing like the L31 350 vortec heads. The 305s was more of a swirl port type head.
They also had 4.3L v6 vortec engines in that same time frame used in the blazers/jimmys
It's a "vortec" 305. 9.1:1 compression, roller cam, "vortec" heads, but nothing like the L31 350 vortec heads. The 305s was more of a swirl port type head.
They also had 4.3L v6 vortec engines in that same time frame used in the blazers/jimmys
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: 305 VORTEC ??????
In defense of the 305 Vortec it was rated at 230 HP though..A lil stronger than the Lg4,Lo3,L69,and most LB9s.
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Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: 305 VORTEC ??????
Yeah, "it wasn't anywhere near as good as it's 350 Vortec big brother" is a bit misleading. It went from 170HP as an L03 to 220HP as an L30...a very nice jump. Just as the L05 went from 190/210 to 255. So as an upgrade, the Vortec treatment on the 305 was just as effective.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 305 VORTEC ??????
Yeah, "it wasn't anywhere near as good as it's 350 Vortec big brother" is a bit misleading. It went from 170HP as an L03 to 220HP as an L30...a very nice jump. Just as the L05 went from 190/210 to 255. So as an upgrade, the Vortec treatment on the 305 was just as effective.
The 305 heads on a 305 are just as good as the 350 heads on a 350 and probably better than the 350 heads would be on a 305.
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Car: 91 R/S , 89 dodge p/u
Engine: L31 GM crate re-cammed , 318
Transmission: T-5 , 4 speed auto
Axle/Gears: 3.42 , ?
Re: 305 VORTEC ??????
well the results of my question surprised me . I can only assume that many people who think they have 350's in fact have 305's in trucks and vans . well your never too old to learn (I'm really old) . so an old phart like me learned a lot . thanks ................
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 305 VORTEC ??????
You can tell on the trucks/vans/suburbans and what not pretty easily. On the 1996-2002 vortec years if it is factory a "M" in the 8th digit of the vin is a 305. A "R" in the 8th digit is a 350. The factory 305s came with a Y pipe and a single catalytic converter. The 350s came with dual cats and pipes back to the muffler. My 1997 G1500 came from the factory with the "R" 350 in it. You could get a light duty G2500 with the "M" 305 in it and you could get a heavy duty G3500 with a "W" 4.3 in it. Just depends on how the option sheet was checked.
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: 305 VORTEC ??????
I can tell you my friend bought a new vortec 305 single cab pickup the first yr they came out it was either 95 or 96. It ran off and left my single cab L05 pickup I had at the time
#12
Re: 305 VORTEC ??????
Yes, there were real 305 Vortec heads. I had always heard that they were only found in 1 or 2 years of Pick Up Trucks.
350 Vortecs, last 3 numbers of castings = 906 and/or 062 64cc Chambers
305 Vortecs = 058 58cc Chambers
At least that is what an old guy with "halfheimers" can remember!
350 Vortecs, last 3 numbers of castings = 906 and/or 062 64cc Chambers
305 Vortecs = 058 58cc Chambers
At least that is what an old guy with "halfheimers" can remember!
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