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Is this cam too big ? SB

Posted By: krw71ragtop

Is this cam too big ? SB - 03/07/09 03:01 AM

I really like the torque I got with this cam in my 416 stroker (502 ft lbs @ 4100 rpm's). I'm trying to put together a LA 360 with stock stroke crank, KB373 .030 over pistons, 70 cc J-heads/ 2.02-1.88 valves, specs were ok on my valve springs for this cam.
I want to use this cam in the solid lifter version since I already have adj rockers. This will be going in an A-body, 3.55 gears, 3500 stahl converter, 340 torker intake, 670 holley, headers, and street driven.
I havent purchased the pistons yet but looks like I'll achieve quench with the kb373's. The rest of the parts I already have.
One of my concerns is will I have enough vacuum for power brakes ? Will this cam have too much lift for the valve terrain I have ? Is it to radical for a street driven car ? Just wondering how this cam will act in stock stroke engine ?

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Posted By: 451Mopar

Re: Is this cam too big ? SB - 03/07/09 07:44 AM

If you have 10:1 compression or higher you may be ok, but I think with the 3.55:1 gears you might be better off with a slightly smaller cam.
Posted By: aarcuda

Re: Is this cam too big ? SB - 03/08/09 04:08 PM

i think you'll be fine but ya, 3.91's or steeper would be better.

Power brakes will work but realize your near the edge and if youre in traffic, a few pumps may get you. try a vacuum resevoir and you'll be fine. i run one like that and i just keep in my mind how much engine braking i do (it builds vacuum). I installed a vacuum gauge in my car so i know.

you'll like the cam. I like mine and mines 245/250. I want to go one step higher to a 250/260 or even a 260/265 but my compression is borderline (really below) what i should have for a bigger cam like that.

i mounted my vacuum can under the battery tray

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Posted By: MR_P_BODY

Re: Is this cam too big ? SB - 03/08/09 04:17 PM

Thats a Straightline cam, you might install it at 106
to help the bottom end for the street instead of the
108
Posted By: Streetwize

Re: Is this cam too big ? SB - 03/08/09 04:34 PM

3.55's are going to keep the motor a couple 100 rpm away from its Happy place....If it were me I'd skip 3.91's and go to maybe a 4.10 or even a 4.30 combined with a slightly taller tire...that way you're netting both a deeper gear and more bite at the same time.

With AUTOMATICS I've had and seen too many motors that really didn't see a huge difference (in et OR mpg) between a 3.55 and a 3.91)....by jumping more than 10% overall you can fine tune with tire size.
Posted By: MoparforLife

Re: Is this cam too big ? SB - 03/08/09 04:43 PM

were it me I would also ditch the 340 torker intake. Never have had much luck with it nor have many I know that have tried it. Think you would like the Airgap, RPM, or LD340 better.
Posted By: topfueldart

Re: Is this cam too big ? SB - 03/08/09 09:25 PM

"Theres no such thing as too much camshaft, only, not enough motor." Steve Dulcich
Posted By: krw71ragtop

Re: Is this cam too big ? SB - 03/09/09 02:42 AM

Thanks for the input guys. I wanted to build a 408 this time but since I went way over budget on my 416, and the Barracuda (e-body) is still not finished I'm trying to use the parts I have on hand for the 360. Besides, the 416 was just scary in the Scamp.
I'm trying to achieve quench with this motor and it looks like my compression will be around 10.5 with the KB373's. Today I measured the depth of the heart shaped area of the combustion chamber of the head and got .085" on one & .094" on the other, so looks like one will need milled.
I have a set of 4.10's but looking for a 3.91. Planning on using 4.10 in the e-body. My buddy is doing all the math on the comp. ratio and cam timing ( I think he really enjoys this part of the build). Thanks mr p body I'll let him know about degreeing the cam. I wasnt sure about the torker intake. It was on the motor when I got it. I do have an AG on my 416 . And I know there is no such thing as a cam being too big ! Just want to make it street friendly and not go crazy on HP since my 19 year old may occasionally drive it . Anymore advice would be great.
Posted By: Rapid340

Re: Is this cam too big ? SB - 03/09/09 12:18 PM

Quote:

Today I measured the depth of the heart shaped area of the combustion chamber of the head and got .085" on one & .094" on the other




You should measure every chamber. Its unlikely they will all be that close.
Posted By: krw71ragtop

Re: Is this cam too big ? SB - 03/09/09 03:53 PM

Quote:

Quote:

Today I measured the depth of the heart shaped area of the combustion chamber of the head and got .085" on one & .094" on the other




You should measure every chamber. Its unlikely they will all be that close.



I guess I should have clarified 0.85" across on one head (one was .086) and .094 across on the other head. I used feeler guages and a 12" ruler and moved them around to the deepest point. I also want to polish the chambers. Any suggestions on where I can get polishing tips for a dremmel? Or the best way to polish the heads would be great. I just want a nice shiny finish.
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