Author Topic: 1991 chevy v3500 help with camshaft  (Read 2398 times)

Offline Trucker2k16

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1991 chevy v3500 help with camshaft
« on: March 31, 2021, 07:13:12 PM »
Hello everyone i got a '91 v3500 i have a mild built 383 stroker to go in well i built the engine for a lighter truck years ago before i put it in storage any way i know the v3500 is heavy for a 3000 stall so i found 2 cams that will work with a stock stall converter.. NOW MIND IM NOT RACING THE TRUCK NOR WILL IT EVER TOW AGAIN IN IT'S LIFE.....!!! It's just to drive around and will not be a daily one cam is comp cams hydro roller 8-412-8 the other a sum-1065 flat tappet. Im buying a new converter actually thought about a 2200-2500 can anyone help me out the heads are 64cc chambers 200cc runners flat top +5.00 cc pistons at 10:33.1 i can post cam specs as well in this post of the 2 cams can anyone help me out? I know this is crazy please dont bash me

Offline Trucker2k16

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Re: 1991 chevy v3500 help with camshaft
« Reply #1 on: March 31, 2021, 07:50:02 PM »
Also this cam

Offline frotosride

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Re: 1991 chevy v3500 help with camshaft
« Reply #2 on: March 31, 2021, 09:10:07 PM »
There's a lot more info many of us would like to have about your truck but I'd assume you are going with a carburetor because no TBI unit will handle any of those cams very well if at all.
Remember you are going to get a lot of mixed reviews so figure out exactly what you want and shift through facts to make you hopefully new and more informed decision.

With what you have posted the first off the list of potential is the last cam you posted. That LSA will sound good but that's the only thing good about it in your application. I would assume since you're using a 3500 you have hydroboost so vacuum at idle won't be an issue. However you may find that the amount of in burnt fuel at idle will be unbearable. Remember, that in the racing community the narrow LSA ( with reguard to lift and duration factors) is used to make a narrower and more peaky power band. Remember the tighter(smaller in degrees) the LSA the more low end torque you will make but at a cost. Not wanting a loose converter is very unlikely accomplishment with that cam. it says it'll work and that's because of the lower duration.

For me the other two are a toss up. If the block is already ready for a roller cam and you have roller lifters the comps cam would be my first pick because on a daily I like hydraulic rollers and the split duration and lift. But price is killing me if you don't already have everything else.
The summit cam has more intake duration which will help cylinder filling but it will also make power higher than any of the 3 because of the duration and LSA.

So I'd snatch both summit cams, two gasket sets, make sure my lifters are good and figure which I like the best for how and when you drive it. If you're just making noise, can handle a rough idle, good at tuning to get that snappy torque go with the Sum-1785.
I'm the end it's all about what you wanna live with since you're not focused a purpose built machine.
"Beat it like a red-headed ford"
1987 v10 Silverado(LQ4), 87 R10,83 K20, 83 cucv 6.2 Detroit
2006 Boulevard M109R 109 cid,2019 M109R BOSS
2009 Jeep XK, (future LS Swap)
GSXR 750 engine awaiting go kart

Offline Trucker2k16

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Re: 1991 chevy v3500 help with camshaft
« Reply #3 on: March 31, 2021, 09:29:15 PM »
Thank you i actually bought all 3 lol ill start with the roller to not stress the break in off the bat.
But will try all 3 and see what fits me well.
Show in get a 2000 stall or 1800?

Offline frotosride

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Re: 1991 chevy v3500 help with camshaft
« Reply #4 on: April 01, 2021, 06:12:02 AM »
You can easily find one in that range. Remember that the converters stall isn't a hard fact. The advertised RPM is typically a band and the actual stall will be different to some degree depending on the engine. Torque production is the leading culprit. All of this is based on a lot of factors. From weight of vehicle to valve train events based on cam selection and average torque production.

Here's an article for you to read.
http://www.hughesperformance.com/tc-stall/

Then call this company or one of your choice. Tell answer all their questions about your truck and you'll have the right converter. No one here can tell you which one to get and have any real hopes to help you until you settle on an actual cam shaft.
To help: go to comp cams website and down load their cam dyno to. Plug in the numbers and it will give you a good idea of what the engine should be capable of..(tuning is vital). This will help you understand more about the cam characteristics and their effect on your truck and wallet. All though the wallet may be ok since you just got all three cams.
What hydraulic roller lifters do you have for the comp cam?
« Last Edit: April 01, 2021, 06:13:58 AM by frotosride »
"Beat it like a red-headed ford"
1987 v10 Silverado(LQ4), 87 R10,83 K20, 83 cucv 6.2 Detroit
2006 Boulevard M109R 109 cid,2019 M109R BOSS
2009 Jeep XK, (future LS Swap)
GSXR 750 engine awaiting go kart

Offline Trucker2k16

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Re: 1991 chevy v3500 help with camshaft
« Reply #5 on: April 01, 2021, 06:56:12 AM »
Comp cams 850-16 high energy i can get a 1800-2000 or 2200-2400 stall from o reillys which i understand this is a guess.

I called hughes performance and they pretty much laughed at me and canceled my order for a 2200 stall

Offline Trucker2k16

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Re: 1991 chevy v3500 help with camshaft
« Reply #6 on: April 01, 2021, 07:15:55 AM »
Oh and i know i gotta change valve springs right now im set up for flat so i got some comp 986-6 springs i know i have to stay with my same installed height i have now which is 1.750 i was gonna go 1.800 but i had that brain fart loland the springs that the comp cams recommend are he 986-6 which are also replacement springs for the heads

Offline frotosride

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Re: 1991 chevy v3500 help with camshaft
« Reply #7 on: April 01, 2021, 09:11:55 AM »
Did you give Hughes and give them the specs for each bump stick?
What did they recommend? 3000+?
"Beat it like a red-headed ford"
1987 v10 Silverado(LQ4), 87 R10,83 K20, 83 cucv 6.2 Detroit
2006 Boulevard M109R 109 cid,2019 M109R BOSS
2009 Jeep XK, (future LS Swap)
GSXR 750 engine awaiting go kart

Offline Trucker2k16

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Re: 1991 chevy v3500 help with camshaft
« Reply #8 on: April 01, 2021, 09:19:25 AM »
No i ordered a 3000 stall due to the cam that's in it right now which is why im changing cams one guy said stayvas close to 220 duration as i can anything more and ill be disappointed being the weight of the truck which i totally get i talked to steve and im pretty sure he said something about a 2200 but know for sure he said id need a xtm but im not ever gonna tow or ever pull anything also. I cant remember what stall he said but i swear it was 2200 or close to that

Offline peewee0413

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Re: 1991 chevy v3500 help with camshaft
« Reply #9 on: July 31, 2022, 03:01:14 AM »
Go overkill with tranny coolers. If you don't maintain 150 - 160 buy a 2nd. No such thing as too much tranny cooling. I bought bigger than recommended by manufacturer, and it took two to keep me under 160. Fluid temp and lack of filter/fluid change is a tranny killer.

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