Just picked up a set of vortec 062 iron castings new. The heads have 1.94 - 1.50 valves in them. These heads in stock form supposedly have decent flow #'s These heads will be bolted on a 383 stroker I'm building. I hope to get around 380-400 hp. At what point does valve size come into play. Anyone care to take a guess? Thanks.
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The weight argument it stupid, compare a Warhawk LS motor to a all aluminum BBC, the weight difference is worth it to me with the kazillion more cubes.
i've built some vortec headed 383s most of them end up in the 400hp range on the dyno with flattop pistons and a decent hyd roller-heads dont benefit much from bigger valves,even with port work
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Man that really sucks. I just went and looked and sure enough the 062's I have were made in Mexico. I just bought these heads new from summit racing. I wonder how much smaller the intake port volumes are, compared to the U.S made ones?
__________________ 00 Z28 NBM A4 273 gears for now
The weight argument it stupid, compare a Warhawk LS motor to a all aluminum BBC, the weight difference is worth it to me with the kazillion more cubes.
yeah, the vortecs flow pretty good with theyre stock 1.94" size valves, the reason being is because the actual opening in the head at the bottom of the valve seat is the same size as a 2.02 valve, but the diameter at the top of the valve seat on a 1.94 head is alittle smaller(1.94" vs. 2.02") so there isnt really that big of a flow difference. Plus GM engineered the ports to flow good with a 1.94" vavle.
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They share the same basic combution chamber design as the ZZ4/LT1/LT4/Fast Burn heads from GM. For the most part, on these other heads, a 2.00" int valve & a 1.56" exh valve is prefered for being ideal. I would then port the heads, just because I hate leaving HP on the table(But I also do my own porting too).
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i've built some vortec headed 383s most of them end up in the 400hp range on the dyno with flattop pistons and a decent hyd roller-heads dont benefit much from bigger valves,even with port work
You are incorrect.
stock vortecs vs ported vortecs with big valves is a huge air flow increase.
this was a set of 4.3 vortecs,they share the same 170cc intake runner as the 062 head.The sheet shows 1.94 and 1.5 but they are 2.02 and 1.60 valve sizes.I think the chart says 272 and 202 exhaust.
A stock Vortec head flows 218 cfm intake and 150 cfm exhaust
im sorry but thats a huge gain,and look at the low lift numbers where most street cars are going to be,in the mid 550 lift range.Ideal street head that can support big power.Ive made 388whp on a dynojet 248 dyno and tons of power under the curve with 575 ft tq in a super mild 406 with the same port work and flow numbers on a v8 062 or 906 casting vortec head.Combo was so basic it was wrong.
10 to 1 dish piston 406
stock crank and beemed stock rods
the ported vortecs
vic jr intake
tci street fighter converter
3.73 gears
850dp
isky z35 solid cam(very street car friendly and fun)pulls from 2500 to 7000,made peak tq at like 3700 rpm and peak hp at 6100rpm.I garuntee that wouldnt happen with a stock un touched vortec head,not to mention stock they will only handle about .480 lift anything more and the retainer hits the guides.Car was 3700lbs and went 11.60 at 116 all day long and 10.56 at 129 on a 150 shot.
If you have any questions about vortec heads or what cam to run with them or where you need them sent to achieve the same flow as mine pm me and i will share all the details you need.Best bang for the buck street head PERIOD.
yeah, the vortecs flow pretty good with theyre stock 1.94" size valves, the reason being is because the actual opening in the head at the bottom of the valve seat is the same size as a 2.02 valve, but the diameter at the top of the valve seat on a 1.94 head is alittle smaller(1.94" vs. 2.02") so there isnt really that big of a flow difference. Plus GM engineered the ports to flow good with a 1.94" vavle.
This is why when running a 2.02 you unshroud the valve.
stock vortecs vs ported vortecs with big valves is a huge air flow increase.
this was a set of 4.3 vortecs,they share the same 170cc intake runner as the 062 head.The sheet shows 1.94 and 1.5 but they are 2.02 and 1.60 valve sizes.I think the chart says 272 and 202 exhaust.
A stock Vortec head flows 218 cfm intake and 150 cfm exhaust
im sorry but thats a huge gain,and look at the low lift numbers where most street cars are going to be,in the mid 550 lift range.Ideal street head that can support big power.Ive made 388whp on a dynojet 248 dyno and tons of power under the curve with 575 ft tq in a super mild 406 with the same port work and flow numbers on a v8 062 or 906 casting vortec head.Combo was so basic it was wrong.
10 to 1 dish piston 406
stock crank and beemed stock rods
the ported vortecs
vic jr intake
tci street fighter converter
3.73 gears
850dp
isky z35 solid cam(very street car friendly and fun)pulls from 2500 to 7000,made peak tq at like 3700 rpm and peak hp at 6100rpm.I garuntee that wouldnt happen with a stock un touched vortec head,not to mention stock they will only handle about .480 lift anything more and the retainer hits the guides.Car was 3700lbs and went 11.60 at 116 all day long and 10.56 at 129 on a 150 shot.
If you have any questions about vortec heads or what cam to run with them or where you need them sent to achieve the same flow as mine pm me and i will share all the details you need.Best bang for the buck street head PERIOD.
What were the cam specs on that motor? Do you have any pics of the ports on these heads? Where did you get them done? Im am working on a set now to test after I run my car with the NON- Ported heads first.
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The weight argument it stupid, compare a Warhawk LS motor to a all aluminum BBC, the weight difference is worth it to me with the kazillion more cubes.
thats a nice combo elky i had a simmilar combo that ran 11.64@113.8 /10.95@120 125 shot in a 3500lb malibu .Really fun cheap combo till the .060 came to haunt me .Vortecs are a great street head for lo buck guys ,had a lil fun with the 1 pic both are motor launches.
400 .060
kb flat tops
stock rods & crank
unported 062 vortecs ,screw in studs ,1.5 RR,crane h-11 springs,
comp 282S 244/252 520/540 110
super vic ,750 m/d
9.5 torco verter/th350
3.42 275/60/ 15 mt dr
bench seat , column shifter
The weight argument it stupid, compare a Warhawk LS motor to a all aluminum BBC, the weight difference is worth it to me with the kazillion more cubes.
just spend the $$$ and get a vortec intake , if u check the ports the vortec are slightly higher and with the re-useable gaskets and ford style bolt pattern no worrys about leaks my .02
Vortec heads 
