Vortec heads
I am also looking at doing a 383 (4 bolt main) with Vortec heads and intake. Would you suggest Fuel injection or carb? Can I get away with the stock FI unit off a Vortec V8?
Also anybody ever run N20 on one of these setups with any positive results?
Also anybody ever run N20 on one of these setups with any positive results?
Teching In
Joined: Oct 2008
Posts: 22
Likes: 0
From: Lincoln Nebraska.
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.
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.
i joined this site just for this post. that is absolutly rediculous. how much work was this job and where was it done? im in the very begining stages for a 383, (was going 406 but both blocks were cracked) and would like to not choke them down so much. trying for 450 hp 450 ft lbs. or as close to as possible!!
Well, the general build with a 355 ends up with 425 HP and 450 TQ give or take, the general 383 ends up with 450 HP and 500 TQ give or take with a decent cam shaft. All results i have seen that were like this were roller cams and roller rockers. The numbers posted above were close to the numbers for the engines i mentioned. The 355 cubed motors fall off around 6500 RPM while the 383 is out of steam at 6000 or so.
Hope this helps you.
Hope this helps you.
Teching In
Joined: Oct 2008
Posts: 22
Likes: 0
From: Lincoln Nebraska.
good info!
wanting as much out of them vortecs as possible. have a 4 bolt 350. will go 383 if needed.
not concerned about gas milage.
was going to go with a 400, but both i could come up with were bad blocks, and all builds i could make with the extreme energy 274 cam pulled over 500 tq, 450 hp.
i have another build i was wondering on.
400, 9.85 comp, bracketmaster 285/285 455/455 all the other basics, its an old cam and the numbers came out to be 435 hp, 525 ft lbs! that done even sound real possible with that old cam.
any advice?
zone, what is ur "general build" on a vortec headded 355/383?
wanting as much out of them vortecs as possible. have a 4 bolt 350. will go 383 if needed.
not concerned about gas milage.
was going to go with a 400, but both i could come up with were bad blocks, and all builds i could make with the extreme energy 274 cam pulled over 500 tq, 450 hp.
i have another build i was wondering on.
400, 9.85 comp, bracketmaster 285/285 455/455 all the other basics, its an old cam and the numbers came out to be 435 hp, 525 ft lbs! that done even sound real possible with that old cam.
any advice?
zone, what is ur "general build" on a vortec headded 355/383?
The builds were based off 10-10.5 to 1 compression, the cams were i believe 230/236 duration at .050 and 5.10 .520 lift zero decked if i remember correctly with air gap manifolds and 750 carbs. A 400 SBC will run out of steam around 560 RPM or so, but yes, the TQ numbers are outstanding on all vortec 400 builds i have seen. The low end TQ it builds is sure to find weak points in the first sixty feet at the track on slicks. But for a nice well rounded street motor the 383 is optimal for plenty of TQ and power that no one will laugh at, it is not only the power but the curve it makes and even exchange from TQ to HP across the board that also make them a good motor for street and strip. Make it forged and you can spray a 200 shot on top and make 750 FTLBS TQ easily.
TECH Resident
Joined: Oct 2005
Posts: 814
Likes: 0
From: Champaign IL
slightly off topic, but will a Super Victor Or Hurricane for the vortecs clear a stock '82 SMC hood with or without an air cleaner. I have a dual snorkel I would like to run. I want one of the single planes so I can spray a a 250 shot without any problems with distribution that a dual plane could cause.
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On The Tree
Joined: Feb 2007
Posts: 156
Likes: 0
I have a question about the max cam lift you can run with stock vortec heads.....ive sometimes saw on advertisements where it says not to run a cam over .470 or .480 lift.why shouldnt you if you have a good set of valve springs on it?I have a .488 lift cam in my 355 and have been considering a set of vortecs but i havent because of seeing that.I'll probly go with a set of summit racing cast iron double hump remakes if not vortecs.
Teching In
Joined: Jan 2007
Posts: 17
Likes: 0
If the valve guides are cut down when the "good" springs are installed, then there will be no problem. I cut mine, installed Comp 986-16 springs, 740-16 retainers, and the 611-16 locks. If the heads are cut by a decent head builder you should be good to .525 lift.
Vortec heads Just to let you know that I have up graded vortec heads on the shelf if you might be interested. They will cost you $384.95 ea plus frt and have already got the following work done:
Z28 valve springs good to .525 lift
guides have been machined
pushrod holes have been enlarged to run a 1.6 ratio rocker
If interested check out our website for many more up grade options all the way to .600 lift with screw in studs and guide plates..Or just give me a call..
Z28 valve springs good to .525 lift
guides have been machined
pushrod holes have been enlarged to run a 1.6 ratio rocker
If interested check out our website for many more up grade options all the way to .600 lift with screw in studs and guide plates..Or just give me a call..
TECH Resident
Joined: Oct 2005
Posts: 814
Likes: 0
From: Champaign IL
Im gonna run some sub 11.50's when my heads are done and motor is together next summer. Its gonna fly. And for all the naysayers, JUST WAIT!!! That will be the beauty in the car, No One will Believe it!
that trans is junk, sure the engine will churn some power
but that trans will be shrapnel
Teching In
Joined: Oct 2008
Posts: 22
Likes: 0
From: Lincoln Nebraska.
The builds were based off 10-10.5 to 1 compression, the cams were i believe 230/236 duration at .050 and 5.10 .520 lift zero decked if i remember correctly with air gap manifolds and 750 carbs. A 400 SBC will run out of steam around 560 RPM or so, but yes, the TQ numbers are outstanding on all vortec 400 builds i have seen. The low end TQ it builds is sure to find weak points in the first sixty feet at the track on slicks. But for a nice well rounded street motor the 383 is optimal for plenty of TQ and power that no one will laugh at, it is not only the power but the curve it makes and even exchange from TQ to HP across the board that also make them a good motor for street and strip. Make it forged and you can spray a 200 shot on top and make 750 FTLBS TQ easily.
sorry to take so long for a reply *on vacation*. thanks for the imput. i talked to the guy who did them heads. 450 bucks for stage 2. 600-650, i cant remember, for stage 3. (stage 3 is the same flow numbers as the chart above shows.) for just port work. thats a heck of a deal isnt it?
im thinkin i will get them sent out, for stage 2, seeing how its a street motor, but hey, a little work cant hurt right? then get them machined for .550". that with the xe274 or 286 is it? or what other recoomendations?
4000 lb truck, 700r4, 23-2500 stall, 4.10's. want as much power with them as i can get.? what ya think?
I am going ot be using the comp cam XE 288 HR for my .040 over 350 and portet virtecs. It will make power to 6000 RPM and run great. The specs are 236/242 @.050 and .520/.540 lift. The car is a 95 Z28. So being lighter and a 6 speed makes it a good runner(we will find out). Now, being a heavy truck, yo would want a bit less duration to keep some torque in there on the low end for that stall and the weight of the truck. The step down for the extreme energy line would be 230/236 duration and .510/.520 lift. That is the one i have seen make 428 HP and 458 FTLBS on the engine dyno, that TQ will really help get the truck moving and the stall would be where it should be. It recommends 2500+ stall.
Man, some are just wierd, i have put well over 400 HP to the ground and mine lived for a long time beating the hell out of it, but the secret for me was stock clutches and radials.
TECH Resident
Joined: Oct 2005
Posts: 814
Likes: 0
From: Champaign IL
Hell, fastest pass I know of on stock t5 is 9.xx at 144mph in N20 AFR 347ci mustang.
my roommate and i put together a mild carburated 355 with vortec heads in a 86 RX7 with the WC T5 we would generally trap in the 118-120 mph area, race weight was about 2900 lbs and i tore up that silly T5 shortly after hitting 3rd on one pass
bad luck i guess, T56 or bust now though
but yeah to keep this somewhat on topic, our cam gives us nearly .500 of lift and we just had an area engine machinist grind down the guides for us and we havn't had any problems at all
bad luck i guess, T56 or bust now though
but yeah to keep this somewhat on topic, our cam gives us nearly .500 of lift and we just had an area engine machinist grind down the guides for us and we havn't had any problems at all