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chevrolet327 07-12-2009 06:21 PM

need cam for mud truck
i have tried a comp cam x4270h but im really not happy with the performance
so i will try another cam and need help for choosing the best one here my setup cut-box chevy k20 dana 60 14 bolt axle 4.10 ratio 40 inch tire th400 np205 t-case
350 flat top l2256 piston
vortec head gm performance intake
12-243-3 comp cam
edelbrock 750
stock torque converter
long tube open exhaust

i run the truck always on low gear

chevrolet327 07-12-2009 07:57 PM

i have a summit 1105 in my l79 327 and it perform very well do you is gonna be good for my truck

tuneup427 07-12-2009 08:50 PM

what make you most unhappy with your corrent cam?

chevrolet327 07-12-2009 09:02 PM

the power is like a good 305 with a nice sound this is not normal for 350 with 10.5 to 1 ratio and vortec head

tuneup427 07-12-2009 09:21 PM

comp web sight suggest that you would use a 2200 stall converter with that cam. I would think that you would have a lot more power that you say you do. Did you install it straight up. (stock timing marks). You might want to double check your cam timing. Those cams run pretty well at 4 degrees advanced if I remember right. Maybe some one else will remember for sure.

chevrolet327 07-12-2009 09:26 PM

i have timed straight up i think the four degrees was grind in it

Chevrolet4x4s 07-12-2009 09:46 PM

With the 40 inch tires it makes those 4.10s seem like 2.87s, to make it run like 4.10s with a stock tire you would need 5.86s

techinspector1 07-12-2009 10:16 PM


Originally Posted by chevrolet327
stock torque converter

Agree with tuneup427, needs more converter.

inquiring_mind2 07-12-2009 11:10 PM

I also will agree it needs a bigger stahl probably around a 4000 stahl would be about right. I also agree on needing more gears. I also mudd bogg and I have 35 inch tires but I run a dana 300 transfer case behind a turbo 350 and I have 410 gears you definatley need something in the low to mid 5's to make them turn

ap72 07-13-2009 06:11 AM

with 10.5:1 compression you can't go to a smaller cam, so you need to stall and gear it up. 4.10's with those monster tires really isn't much gear at all though.

chevrolet327 07-13-2009 09:41 AM

do i need to advance the cam of 4 degree

chevrolet327 07-13-2009 09:54 AM

and the truck was always run on 4 low gear it never goes on the road do you think my gear is ok.if not did somebody know if i can find 5.86 gear that fit my current carrier .

techinspector1 07-13-2009 10:25 AM


Originally Posted by chevrolet327
do i need to advance the cam of 4 degree

Advancing the cam will pick up on the bottom, but will also increase cylinder pressure. Depending on fuel used, this could move the motor into detonation.

inquiring_mind2 07-13-2009 10:26 AM

no you will need to get a different carrier. the carrier you have is probably stock and you will need something better. the stock carrier will probably on handle gears up to 456 If I was you I would run a full spool. Here are a couple of numbers you can call to check on the gears Randy's Ring and Pinion 1 877 349 1369 and west coast Differentials 1 800 446 0950.... They may also have full spools but I don't know

chevrolet327 07-13-2009 10:55 AM

the gas is not problem im running 100 octane aviation gas

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