corvette heads?
05-23-2006, 10:12 PM
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Car: 2012 Ram express
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corvette heads?
How could are these heads and who is running them with what results? I was thinking about getting a pair since new aluminum heads are $1000 plus does anybody got a link or some kind of information that has stats on the heads? Also is it a direct swap for my 89 tpi camaro. What year corvette had the best heads?
05-23-2006, 10:46 PM
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Look for casting #10088113 (1986-1989 vette) and yes these heads are a nice upgrade from stock cast iron, but porting really opens them up. 58cc combustion chambers 163cc intake runners and use standard 1.94" intake and 1.50" exhaust valves and could produce any where from 9.5:1-10:1 compression depending on head gasket thickness. EGR provision on the vette was different so you have to adapt something new or do away with completely. I had a pair on my old stock camaro 350 TPI and would estimate a 30hp bolt on increase with no porting and EGR delete.
05-24-2006, 12:32 AM
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diffenrence in corvette and f-body l98
I kno my l98 has 230hp and 330tq how much hp and tq does and c4 l98 have and why is it more then the f-body other then the heads?
05-24-2006, 09:35 AM
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being that the aluminum heads flow better the vettes run more aggressive spark and fuel curves and also have a better flowing factory exhaust. 3.23 gears will also make a huge difference over the stock 2.77, not sure what the vettes came with stock, but I would put money on it being at least 3.23 and most came with Dana rear ends.
05-24-2006, 09:53 AM
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Car: 71 Nova
Engine: Superramed 383, Topline heads
Transmission: 700r4
Axle/Gears: 8.2 posi 3.08
Those heads dont flow very well on the intake side. They have very strong exhaust flow numbers most likely because of the D exhaust ports.This is a quote from CHP.
This aluminum head was used on the Corvette TPI engines from the mid-Eighties until the LT-1 1992 motors were introduced. The 882-iron head out-flowed this head across the board. This piece is not our first choice for a performance head considering that the largest valve this head fits is a 2.00/1.55-inch combination and it has a 58cc chamber.
05-24-2006, 10:34 AM
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cylinder heads
Do the iron heads on my 350 better flowing then the aluminum ones on vettes?
05-24-2006, 10:47 AM
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Car: 71 Nova
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05-24-2006, 11:21 AM
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heads
it seems its a waste of $500 to get aluminum vette heads and just keep the iron l98 heads. My plan was to make a cheap upgrade of heads and cam by getting aluminum vette heads and a lt-1 cam what do you guys think?
05-24-2006, 11:37 AM
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Car: 71 Nova
Engine: Superramed 383, Topline heads
Transmission: 700r4
Axle/Gears: 8.2 posi 3.08
I think it would be a waste because the aluminum heads while stock flow pretty good they will be limited. If you look at the link I posted someone had some l98 heads with a stage 4 port job flowing like 270 which is incredible. I dont think those aluminum heads will ever be capable of flowing that much.
Ok as stated before all flow numbers are off the shop Superflow flowbench and corrected for standard temp and pressure.
First step in stage 4 was cutting for larger valves. For those of you that don't know what this entails it is A LOT of work. The actual cutting isn't to bad, but then you have to install new valve seats, report all the bowls to blend them in, do a new valve job, relieve the chambers for the bigger valves, cc chambers now to see what size they are, maybe mill to bring them back to size (I didn't, I wanted the extra volume to bring compression down a little bit). Now in reality if you were gonna do this this step would come first, except for the new seats you're not into it much more work than before, especially since cutting out for the new valves removes a huge amount of material from the bowls, so you have to spend less time porting Ok now with the 2.02/1.6 standard valves with a 3 angle valve job and a 10* back cut on the valves the flow numbers were :
Lift. Intake Exhaust
.1 72.4 47.6
.2 135.1 101.0
.3 201.3 140.2
.4 237.8 171.1
.5 264.6 187.6
.6 266.1 192.6
As you can see the heads reeaally liked the bigger valves. Though keep in mind that this is after extensive porting, just cutting for bigger valves and going would not get you these kind of numbers. Right now these are a kick but set of heads that would make a lot of power on any streetable small block. Intake runner volume is now between 190 and 195 cc's so you've still got good velocity for the street. Combustion chamber volume is 68 cc's. right now we're at about 70.5% intake exhaust ratio.
For the next Step I used manley pro-flo's to see if their vaunted necked down swirl polished valves really worked.
Lift. Intake Exhaust
.1 82.5 52.5
.2 145.6 111.8
.3 212.9 150.1
.4 245.4 178.6
.5 269.2 190.9
.6 270.6 195.2
First step in stage 4 was cutting for larger valves. For those of you that don't know what this entails it is A LOT of work. The actual cutting isn't to bad, but then you have to install new valve seats, report all the bowls to blend them in, do a new valve job, relieve the chambers for the bigger valves, cc chambers now to see what size they are, maybe mill to bring them back to size (I didn't, I wanted the extra volume to bring compression down a little bit). Now in reality if you were gonna do this this step would come first, except for the new seats you're not into it much more work than before, especially since cutting out for the new valves removes a huge amount of material from the bowls, so you have to spend less time porting Ok now with the 2.02/1.6 standard valves with a 3 angle valve job and a 10* back cut on the valves the flow numbers were :
Lift. Intake Exhaust
.1 72.4 47.6
.2 135.1 101.0
.3 201.3 140.2
.4 237.8 171.1
.5 264.6 187.6
.6 266.1 192.6
As you can see the heads reeaally liked the bigger valves. Though keep in mind that this is after extensive porting, just cutting for bigger valves and going would not get you these kind of numbers. Right now these are a kick but set of heads that would make a lot of power on any streetable small block. Intake runner volume is now between 190 and 195 cc's so you've still got good velocity for the street. Combustion chamber volume is 68 cc's. right now we're at about 70.5% intake exhaust ratio.
For the next Step I used manley pro-flo's to see if their vaunted necked down swirl polished valves really worked.
Lift. Intake Exhaust
.1 82.5 52.5
.2 145.6 111.8
.3 212.9 150.1
.4 245.4 178.6
.5 269.2 190.9
.6 270.6 195.2
05-24-2006, 02:48 PM
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corvette heads
corvette heads r better u can find them at a junk yard and stuff they r not hard to find and they uboilt on if wanted to make a better swap a 305 head on a 350 will give u a high compsion i think corvette tpi is rated from 230 early years 265 but i can be wrong i know its better then camaro
05-24-2006, 03:52 PM
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Car: 71 Nova
Engine: Superramed 383, Topline heads
Transmission: 700r4
Axle/Gears: 8.2 posi 3.08
Whats the big deal about aluminum heads anyway? Its about the flow not the material. You could port the exhausts yourself and have it flowing just as good as the aluminums and then have another $500 to spend elsewhere. Or you could take that $500 and get a nice set of vortecs with all the goodies and put a spanking on those vette heads.
05-26-2006, 07:47 PM
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Originally Posted by shaggy56
Whats the big deal about aluminum heads anyway? Its about the flow not the material. You could port the exhausts yourself and have it flowing just as good as the aluminums and then have another $500 to spend elsewhere. Or you could take that $500 and get a nice set of vortecs with all the goodies and put a spanking on those vette heads.
05-26-2006, 08:01 PM
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Car: 71 Nova
Engine: Superramed 383, Topline heads
Transmission: 700r4
Axle/Gears: 8.2 posi 3.08
So for the price hes going to pay for the aluminum heads his stock heads can be made to flow just as good if not better. If he does it himself he would save all that money. Im sure they are super heads but if you want to spend money then why get those heads if he could spend a little more and get something far superior and not have to worry about porting them. Im sure he could get more bang for the buck for iron heads. If he decides to spend tons of cash on getting those heads and spending to have it worked over he would be alot farther ahead with a set of nice aftermarket aluminum heads.
Last edited by shaggy56; 05-26-2006 at 08:06 PM.
05-26-2006, 08:21 PM
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I am not arguing that money could be spent in better places I was merely pointing out that the vortec are designed after the 113's. A few other things to consider. You can run a little high CR with aluminum heads and they weight half as much as Cast. A lot of people look to the corvette heads for quick boltons.
05-28-2006, 05:58 PM
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Car: 1991 Z28
Engine: 305 TPI
Transmission: WC T5
Axle/Gears: 3.73 Posi
The wieght savings of the aluminum heads is something to keep in mind in our nose heavy cars
05-28-2006, 06:58 PM
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Car: 71 Nova
Engine: Superramed 383, Topline heads
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Ok 50 lbs weight savings from aluminum heads vs over 50 hp increase from vortec heads. I vote for 50 hp any day.
05-29-2006, 01:56 AM
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Car: 92 1500p\u 2wd
Engine: 91 z28 tpi 355
Transmission: 91 700r4
how would you keep egr with the 113 heads...my LTs dont have an air pump setup on them so would i have to weld in a bung for a tube to go to the intake base for my egr parts to work again?
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