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Author Topic:   double hump vs vortec
sledgehammer
Member
posted September 12, 2003 11:10 PM
From a performance stand point I am sure the vortec would be the first choice of most people. With all things considered equal meaning work done to both sets of heads (valves, springs, studs, valve job, guide plates) is there that much of an advantage with the vortecs? Would a set of 461's complete with all of the above be worth 300 dollars?

Thanks

xx RACER 96
Member
posted September 13, 2003 01:32 AM
I'm startin to question the Vortec thing myself after watchin this local fella wax everybody around here week after week, runnin 461's that are as legal as the day is long according to his class rules. Don't 461 "x" heads have the same runner size as the Vortecs, roughly 170 cc's? Same chambers at 64 cc? I realize Vortecs have fast burn capability, but do they outflow 461's that much better between .500-.600 lift?


outlawstock17
Member
posted September 13, 2003 08:13 AM
that's where the vortec's start losing their advantage.....over .500 lift...


rico 08
Member
posted September 13, 2003 08:50 AM
I sold my vortec's over the winter and bought some 'humps for $50,my thought is the only intake choice in cast is limited to one very low rise quadrajet intake and redrilling for the early pattern seems to kill any performance advantage had from what i've seen.If you can run an aluminum intake yes they are excellent.


bryanb30
Member
posted September 15, 2003 08:43 PM
Yes, easier to come by, but are they really that much better? Show me some numbers, 96.


dgb
Member
posted September 16, 2003 08:03 AM
DGB... Great link.


RCRacing #08
Member
posted September 20, 2003 06:12 AM
I think either way you need to spend 300.00 on the heads at the machine shop to really make them perform.

I think either set are very good heads, I have a set of both and untill I burn up the 461 but they were as good if not better than the vortex.


racer038
Member
posted September 20, 2003 08:27 AM
Since we're on the subject, I have 461s and Vortecs, both sets have arp 3/8 s**** in studs, 4808 guide plates, and tall valve covers. I've used stock rocker arms up till now, but would like to upgrade. I'm looking at the Harland Sharp or CompCam Pro Magnum rockers. Question is, can a certain rocker be used interchangeably on either head?. Am I restricted to 3/8" studs? I'd like to be able to move them from the 461s to the Vortec, if I needed to. So far it's like you have to buy something special for the vortec, centerbolt valve covers. Any experience would be appreciated.


66jj
Member
posted September 20, 2003 04:58 PM
i like harland sharps.
i think you can use any rockers on your vortecs since you have guide plates.


racer038
Member
posted September 21, 2003 06:31 AM
I'm mostly concerned about the clearance between the rocker and the bolts holding the centerbolt valve covers to the head. Crane recommended the narrow body rocker for this reason.


66jj
Member
posted September 21, 2003 09:26 AM
thats what i was wondering if your using vavle cover adapters or not.

harland sharps are narrower than most, i bet if you contact them theyll tell you if theyll fit or not. they have a lifetime guarantee.



Eljojo
Member
posted September 21, 2003 09:43 PM
I've got a set ofHarland Sharps under a set of the cheap aluminum high rise valve covers. They are for the 3/8 stud and clear nicely. I had anticipated using a set of 7/16 Scorpions, but ran out of room right there at the cente3r bolt. Racer xx96, I've got one question for you: How did you make 11:1 using the Vortec head? Please be specific.


Eljojo
Member
posted September 22, 2003 06:03 PM
bump


xx RACER 96
Member
posted September 23, 2003 01:51 AM
Thanks! My Vortecs came from Wheeler in Fla. At one time Wheeler offered the Vortec head in a 48 cc chamber. I questioned the sales rep when I bought mine, and he said that the machine work nescesary to achieve this small chamber weakened the cylinder head dramaticaly. I had not planned to use them on the 406, but found that the castings I had set aside for that particular motor had been mistreated by their previous owner and had frozen and cracked. When the time came for the assembly, I had to remove the domes from the pistons I had installed due to the design of the combution chamber. Thanks again for your help. Jon


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