I just want to know if anyone is doing this...and what you think about it. Are these heads a good choice to feed this motor? Can they support the capabilities of a 383 if ported a little? or would it be wiser to just go with AFR's or something???

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350, Comp 262, Edelbrock Performer intake 600 cfm carb and exhaust, headers
-JVC, Eclipse, Pioneer, MTX, Phoenix Gold, Planet Audio

 

I had the vortec heads on my 350 and I am convinced that they are perfect for most any small block street machine. GM uses the vortec heads on a high torque crate motor the puts out around 330 horsepower and something like 400 lb-ft. I could be wrong, I don't have the catalog in front of me. Any way vortecs will be fine as long as you don't expect too much from them horsepower wise. They don't flow as well as many of the aftermarket street small block offerings. That said pocket porting the heads has shown only 20 horsepower and they don't respond at all to larger valves. I would recomend some AFR 190 or 195 heads. They are what I drool over now. Stab in a comp 268h cam with those heads and your engine should really rock!

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter

 

So as not to ruffle anyone's feathers, I'm going to send you some head flow numbers that I've amassed over time.

Most of these were done by GM High Tech Performance mag and extreme pains were taken to insure the tests were fair to all.

Take a look at the flow numbers of the Vortec heads and compare them with others that were flowed with the same exacting setup of the flow bench.

Check for the port stall point of the Vortec's and how well they flow above .400 valve lift.

You can then be the judge.

Hope this helps.

Jake



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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9

 

A friend of mine did this very thing, except his setup was carburated (650 DP). That baby screams; set up was a sanp. I think he used the Performer intake. But it's sweet.

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87 Z28/89 vette 383TPI roller cam/700R4/vetteOEM 2K TC/MSD 6A/SLP stainless headers/edelbrock cat back/Optima/TTops/an angry squirrel.

86 Fiero SE 2.8V6/5SPD/turbo/2nd angry squirrel.

Runs on peanuts!

72 Pinto Wgn Version 3.0 /85 5.0L HO/AOD/ lowered/Shaved/Tinted/Optima/WHITE

 

Especially at the price.... $410 for the pair out of the box, complete! Amazing.

 

As long as you don't get to radical in the cam area, and pull the motor to extremely high RPM's, they will be ok.

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350 4 bolt main, Speed-O-Motive 383 stroker kit, re-sized rods ground for clearance,TRW Forged pistons,10.7:1 compression,HPC Coated RPM intake, Speed Demon 750 cfm carb,World Products Sportsman II heads,2.02/1.60 valves, Comp Cam 1.6 roller rockers, Comp Xtreme 284 cam,240/246@.050 with .540 lift,Crane pushrods,Proform HEI and MSD6A box,HPC coated 1 5/8 headers, 2.5" exhaust with 40 series mufflers,TH350 with B&M 3000 stall, Powertrax NoSlip Locker, 4.11 gears.

 

Some of the circle track cars around here run vortec heads. They rev them to 8000+rpm. They are ported as much as possible run larger valves, better springs, etc.... Of course, they run vortec heads because they are required to run GM casting iron heads. But it's nice to know they potential exists.
On your 383 in stock form, they will produce excellent torque with lots of low-end and mid range power up to 5000-5500 rpm. Build the rest of the engine to match the powerband of the stock vortec heads and you will have a sweet street motor that won't need a high stall converter and/or deep gears to launch hard.


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

 

The Vortec Heads will work Great on a 383, they will run out of steam around 5200-5500 rpm. lots of midrange power. If you want It to pull higher than that your going to need Lots of work to the heads, in which case you'd be better off finding Differnt heads


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It's always SOMETHING
"Sounds like Barry White at idle, Teddy Pendegrass wide open..
if it don't sound like Micheal Bolton your alright"