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Author Topic:   WHich Heads to use
45cent
unregistered
posted November 07, 2003 12:25 AM           
Vortec or camal hump heads which is the best flowing heads for a 4412 stock intake and stock exhuast manifolds Thanks


chomme
Member
posted November 07, 2003 12:30 PM
Well, it depends. You say stock intake, can you run an aluminum intake? If you can then put that 4412 on an aluminum TBI vortec intake and go to town. Otherwise the intake ports don't line up with the older style cast iron factory intakes, so they really won't gain you a whole lot. Plus, vortecs can get expensive in a hurry, when you consider the work needed to be done to use a cam over .450 to .480 lift, etc.

John

dirtbuster
Member
posted November 07, 2003 02:35 PM
If you can use the right intake to match the vortecs go that way. But remember like Dode said the vortecs in stock form are only good to about .450 lift or so without machining the guides down for clearance. They were designed for low revving pickups not high rpm race motors. So a spring change shoudl be done as well. They also require self alignging rocker arms unless you have them drilled for screw in studs and guide plates.


45cent
unregistered
posted November 07, 2003 03:06 PM           
i RUN A HOBBY STOCK WE CAN RUN ANYTHING CAM LIFT JUST NO ROLLER CAM SHAFTS i HAVE A PAIR OF 305 HEADS FOR PAST 2 YEARS ON MY 355 WE COULDN'T RUN VORTEC OR DOUBLE HUMP HEADS
1ST YEAR I PUT 550'S SPRINGS GOOD ROCKERS (THE FIRST YEAR CAM RULE 456 LIFT 0 WITH 450 LIFT CAM WITH 400 BIG BORE 2 BARREL INTAKE WORK OKAY BUT NEED MORE HORSES
2003 SEASON NO CAM RULE EXCEPT NO ROLLERS
PUT 550 LIFT CAM WITH 600 LIFT SPRINGS AND HOLD ON THIS CAM TO WILD FOR A 355 i NEED TO UPGRADE MY HEADS 305'S ARE JUST NOT FLOWING NEED TO KNOW WHICH WAY TO GO I ALREADY HAVE DOUBLE HUMPS JUST NEED TO HAVE SOME WORK DONE TO THEM THANKS FOR ALL THE INPUT


66jj
Member
posted November 07, 2003 04:52 PM
lift tells the least of cam specs..

you can have a 500 lift cam that runs to 7000rpm
depending on duration etc.

put some cam specs on here and people will probably help you out.

305 heads dont flow though, some will say they love them, I have seen them work really well, but the numbers they flow arent good.

dode
Member
posted November 07, 2003 11:40 PM
if you can run an aluminum stock intake and have the $$$, get an aluminum TBI vortec intake and a set of vortec heads with good springs. You are looking at probably $800 for the intake and heads when you are done. That's my 2 cents.

John

45cent
unregistered
posted November 08, 2003 10:47 AM           
We have to use stock cast iron intake no tbi Alum intake


URDUSTED
Member
posted November 09, 2003 08:10 AM
where are a couple reputable dealers for vortecs? Do they use stock chevy valves? Definately want to run Stainless, Need about a 530 lift clearance. So I guess what the real question is what needs to be done to them. I have a reputable machine shop if I can get a set already done. Thanks


dode
Member
posted November 10, 2003 10:07 AM
Will your track allow you to run over the counter gm parts? That is the only "stock" cast iron intake that fits the vortec heads. We are running into this at our track and they will not allow the over the counter parts.

John

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