vortec heads?
#1
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Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
vortec heads?
Hey, i have been looking on ebay for some vortec heads. they all say they are for a 350. will these still work for my 305. i was thinking they will but i wanted to be sure, and also is there any certain model i should look for. Let me know what you guys think.
Thanks
Thanks
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Car: '92 RS, '84 Z28
Engine: 383, L69
Transmission: T56, 700R4
Axle/Gears: 3.42, 3.42
yes they will work, but the drawback will be you will lose compression due to the fact that they have 62-64 cc combustion chambers, where your 305 has 58 cc chambers. You could have them milled to the same cc tho. As far as which casting number is better i dont know.
Kevin
Kevin
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Car: 89 Camaro RS
Engine: 305 TBI
Transmission: 700R4
There are two different castings of the vortecs. One isn't as good as the other.
12558060 is the part number of the good ones, I'm not sure what the casting number is though. I had mine milled down .030 for about 60 bucks. Then used a thin head gasket.
12558060 is the part number of the good ones, I'm not sure what the casting number is though. I had mine milled down .030 for about 60 bucks. Then used a thin head gasket.
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Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
http://www.mortec.com/castnum.htm
Either one is fine.
Avoid the next two at all costs. They're the 305 heads. They're not even good for an upgrade on your 305. :nono:
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber, 170cc intake port, 1.94"/1.5" valves
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port
Avoid the next two at all costs. They're the 305 heads. They're not even good for an upgrade on your 305. :nono:
12558059...97......305..........Vortec, truck, 1.84"/1.5" valves
12552520...97-up...305..........Vortec, truck
12552520...97-up...305..........Vortec, truck
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Car: 92 RS Convertable
Engine: RAMJET 350
Transmission: G-FORCE T-5
there are differences in the vortec heads avoid the ones off an early (first 2 years i think) 3/4 or 1 ton truck they have a restriction and slightly diffrent shap in the intake port. which makes them not as good as the other ones for performance
just my 2 cents
Ryan
just my 2 cents
Ryan
#7
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The eight-bolt intake bolt pattern is totally different than the early model V8 12-bolt design. Use new manifold P/N 12366573, 12496820, 12496822.
450 bucks a pair right now at most places, or you can find a set of good used ones in a yard off an L31 truck 96-up for less in which i am going to do
you have to use a special intake to run carb or any injection manifold other than what came on these
http://www.google.com/search?q=12558...hl=en&safe=off
http://www.macmaster.on.ca/sbgm.htm
http://gilbertautoparts.com/frame.ht...TOKEN=33173055
http://www.mortec.com/castnum.htm
450 bucks a pair right now at most places, or you can find a set of good used ones in a yard off an L31 truck 96-up for less in which i am going to do
you have to use a special intake to run carb or any injection manifold other than what came on these
http://www.google.com/search?q=12558...hl=en&safe=off
http://www.macmaster.on.ca/sbgm.htm
http://gilbertautoparts.com/frame.ht...TOKEN=33173055
http://www.mortec.com/castnum.htm
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
EDIT- Wow, just looked at when this post was originally posted.
Last edited by Fast355; 02-09-2007 at 07:15 PM.
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Re: vortec heads?
Just a note, but I appreciate updates on old posts. I am researching head numbers to build my 355 TPI motor, so this is important information to me. Keep it up. Thanks.
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