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How much did those heads cost you? according to my new Super Chevy GM designed these to be a cheap alternative to all the current al aftermarket heads, and they are $700 assembled, but they seem to be $1000 everywhere I look.
 

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He didn't pay for them. He works for a magazine and this is a test. I'm not sure but it may be the mag you mentioned.
 

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Nova77X said:
How much did those heads cost you? according to my new Super Chevy GM designed these to be a cheap alternative to all the current al aftermarket heads, and they are $700 assembled, but they seem to be $1000 everywhere I look.

Heck if thats the case then I would just go with a set of AFR ot TFS heads for the same price if not a couple hundred more. The whole point behind the vortec's was they were cheap, plentifull, and made killer power for stock castings. In the end they still weigh a ton compared to aluminum heads and have all the other drawbacks of iron heads.

That being said if these were selling for say $500 a set complete then I might consider them an alternative to aluminum castings for budget racers.
 

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Discussion Starter #44
First, let me say I do not work for any magazine's. I'm just a regular guy with a Nova that got his pic of his car in CHP and happened to be in the right place at the right time to hear a conversation, and I took the liberty to chime in. I met some of the editors and photographers through a welding job I did on an altered wheelbase Nova, and thay found out I was a Nova-haulic as well. Soon thereafter, opportunities came my way, some of which I turned down,and some I'm still scratching my head on (as in the Fairmont Funny).I turned down the testing of the Performance Online suspension parts for an article, because I could not stomach someone else driving my beloved car through a slalom course beating the tar outta it. But when this GM deal came my way, as I had a set of Vortec's already, I jumped on it. I've tried to keep my car as pure GM as possible, this is just the next step. Its alot of work, swapping parts around, I ain't gettin paid a dime and I think I'm doing a service of sorts to the street machine and 'strip community to show how these heads will do. I think what is cool is we have so much out there to choose from, there's something right for everyone. On pricing, there are two versions out now, I don't know if there is a price difference between the two. Dale
 

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teddisnoke said:
First, let me say I do not work for any magazine's. I'm just a regular guy with a Nova that got his pic of his car in CHP and happened to be in the right place at the right time to hear a conversation, and I took the liberty to chime in.
Thanks for clarifyong that. I apologize...I misunderstood.

Still cool stuff though! :D
 

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Discussion Starter #46
LOL. Mario- I think its best we leave our stock suspensions be, after you and your spindle woes and me with, well, lets say stock is cool. Those heads were good today for a 12.12 @114 mph compared to a best 1/4 mile of 12.39 @112 mph. Todays pass was at 2000 ft. on a hot day, and the other was at Carlsbad (near sea level) A good day at a track with cooler conditions and no wind would hopefully produce an 11 second run.
 

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Gm Vortec Bowtie Heads??

Anyone running GM Vortec Bowtie small port heads part#25534421? Im building a 383 and its time to choose what heads to use.
They seem to flow pretty well, and accept up to .530 lift
Around $490 each complete.
Please look at the numbers and tell me what you think.

Flow Numbers intake:
SMALL-PORT HEAD
Lift CFM
0.100 67
0.200 136
0.300 182
0.400 223
0.500 251
0.600 240
0.700 240

Any info would be appreciated!

A-M
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I did a set of these for a customer in September and the flow numbers out of the box were:

Intake
.200 123.3
.300 181
.400 222
.500 241.5
.600 241.5
Since the port stalled at .500 lift I didnt go to .700
Flow @ 28" 4.00 Bore and Radiused Inlet Guide

Exhaust
.200 121
.300 148.8
.400 155.6
.500 156.5
.600 157.8
Flow @ 28" No Exhaust tube




Flow after. I had to rape the chamber around the spark plug to clear the piston. Short block was assembled.

Intake
.200 145.5
.300 206.7
.400 246.6
.500 262.3
.600 273
.700 276
Flow @ 28" 4.00 Bore. Radiused inlet guide

Exhaust
.200 128
.300 176
.400 203
.500 216
.600 221
.700 224.6
Flow @ 28" w/o Tube

One issue with the exhaust is the center line of the port is not the center line of the bolt pattern. I think an 1.625" header will leave the top of the port uncovered.
 

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Thanks for the info guys!

Thanks alot for your help guys!
The thing is that Ive sold my Vortec L31s and looking for new heads. Ive found out that its better to do some research BEFORE the purchase... Ive been looking at both AFR 180-195 and Brodix Race Rites 180, then I stumbled on these Bowtie Vortecs from GM.

I dont mind buying alu heads, not at all! Im looking for a 23 deg bolt on alternative that makes good torque for the street but also some brutal power on higher end. I thought the Bowties were a sweet deal, but after reading posts about holes that dont line up, headders that wont fit etc etc I guess there are better options out there!

Please let me know what heads you think would be the best bang for the buck?

Chevy 383
SRP -16 dish that would give app. 9.7-9.8CR with 64cc chambers
Isky Mega Hyd 274 flat tappet camshaft/lifters

Matt
 

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I'd try the AFR CNC series heads. Article in latest Chevy High Performance had me impressed with quality and flow. 260 cfm on the 180 but a whopping 240 cfm at only .400 lift. Cost is a reasonable $700-1000 each.
Hand porting any head to that level would be much more expensive and not as good.
Lot's of options available so they can build them custom to your application. Call AFR for specific recommendations.
 

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looks like im late to the converstion, but is it even worth getting the bowtie to put on a: 350, Crane duration 284/292 lift .509/.528, at 10:1 compression
 

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