LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

305 or 503 which should i do?

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Old 07-04-2005, 10:43 PM
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305 or 503 which should i do?

I Still Want Low End For Driving On The Street But Also Want A Good Lope And Over All Power. Should I Consider The Hot Cam Also? I Am Not Worried About Peak Power. I Have Most Bolt Ons And Want It Too Lope Now. I Have Good Low End Now And Dont Want To Loose It. I Have An Auto And Might Get A Stall Later In A Few Months If It Is Really Need. Just Let Me Know Waht You Guys Think.
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Old 07-05-2005, 12:36 AM
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Re: 305 or 503 which should i do?

I went though the same dilema when I put my cam in. Very happy with mine. Cheaper than the Hotcam and very simillar. Get the 305 and don't look back.
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Old 07-05-2005, 06:54 AM
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Re: 305 or 503 which should i do?

does it lope pretty good still. i want it on a 112 LSA
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Old 07-05-2005, 09:20 AM
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Re: 305 or 503 which should i do?

Well I have a M6 so can't say if a stall is needed with an auto but I didn't loose any bottom on mine, and absolutely love the 224/230....yes it lopes great!!
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Old 07-05-2005, 10:37 AM
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Re: 305 or 503 which should i do?

GM 846 I think would be a good choice. 112 LSA with specs slightly bigger than the 305 but with good streetability.

-Dustin-
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Old 07-05-2005, 11:55 AM
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Re: 305 or 503 which should i do?

waht are the specs of the GM 846 and where do i get it at? also with the 224 230 you did not loose any low end at all??
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Old 07-05-2005, 11:59 AM
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Re: 305 or 503 which should i do?

You can get the GM 846 from anywhere that sells GM High Performance Parts.

Specs. 222/230 .509/.528 (1.5RR) 112LSA P/N 12370846

I think the lobes and such of the XE cams are supposed to sustain low end. But many custom cam builders dont like them. And personally I'll take their word for it. If I went with a mid size cam it would be the 846. With any larger aftermarket cam you'll get your TQ curve push up in the RPM's which is why people use stalls to get to that peak TQ quicker.

-Dustin-
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Old 07-05-2005, 03:36 PM
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Re: 305 or 503 which should i do?

I want basically the same performance you do so I emailed CC. They recommended the 503 over the 305. The difference in the numbers leads me to believe the 503 will have a broader power curve which is ideal for everything but drag racing. Most people put too much cam in their cars in the quest for peak hp.

This is the info I have, but I still haven't made up my mind either.
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Old 07-05-2005, 05:22 PM
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Re: 305 or 503 which should i do?

hey Bersalieri is there a GM 847 that is the only one i have have heard of? or is it the 846 maybe i miss understood. i'm curious cause i'm think putting the 847 in, i think that is what my uncle has in his car.
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Old 07-05-2005, 11:23 PM
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Re: 305 or 503 which should i do?

well thanks guys. i didnt even know about the 846. i now have another to choose from. i like the GM 846 cause it is right inbetween the other 2 that i was interested in. it might be the one i do. will these cams fun with stock tune untill i get a tune when i install. i am going to buy tunercat and already have a cable. i was thinking of ordering a tune and upload it myself that way the car isnt down for a couple of days you know. thanks again
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Old 07-06-2005, 12:07 AM
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Re: 305 or 503 which should i do?

224/230 sounds like it would be perfect for what you want.

CC503 all the way.
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Old 07-06-2005, 12:54 AM
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Re: 305 or 503 which should i do?

gm846 =
222, 230 .543, .563 on 112 w/1.6 rr's
.509, .528 w/1.5rr's

It's a fun cam that LOPES like a big cam.
I have a 2500 stall with it, but I would like to have
a 3200 to take better advantage of it
It pulls from 3500 to 6700 really hard!
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Old 07-06-2005, 02:20 AM
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Re: 305 or 503 which should i do?

Originally Posted by meangrn94ta
hey Bersalieri is there a GM 847 that is the only one i have have heard of? or is it the 846 maybe i miss understood. i'm curious cause i'm think putting the 847 in, i think that is what my uncle has in his car.
Its the 847's little brother.

Thanks for the 1.6 RR specs. So how do you like 846 RedLT4Mike? Any infromation you can add? Times/Dyno or Before/Afters?

-Dustin-
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Old 07-06-2005, 04:09 PM
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Re: 305 or 503 which should i do?

so the 847 is a little bigger, i guess it would be since the numbers are larger. where can i find a place to buy it? local GM dealer or what?
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Old 07-06-2005, 04:12 PM
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Re: 305 or 503 which should i do?

Anywhere who sells GM High Performance Parts should be able to sell you one. Scoggin-Dickey and Jim Pace Pontiac are a few I have seen with decent prices. Check around and find the cheapest place. And to be absolutely correct the GM 847 is the 846's BIG brother.

-Dustin-
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