Cam for sbc 350 and supercharger

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brad33478
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Cam for sbc 350 and supercharger

Postby brad33478 » Fri Aug 21, 2015 11:33 am

Block getting bored 30 over and I got my hands on set cast iron vortec heads. Couple people told me I should run a cam designed for a supercharger and I came across this summit kit k1105

Duration 298/304, Lift .466/.487

Hard to get any tech help on how this cam will perform on airboat. Says fair idle and built for midrange power, needs 9.5:1 compression.

Running 2.3 belt drive and most likely a 72" 3 blade



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12x7 deckover
B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$

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scottyroll
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Re: Cam for sbc 350 and supercharger

Postby scottyroll » Fri Aug 21, 2015 11:43 am

Not sure on the Cam specs but you can expect to be in the 3k-5k range quite often while cruising around.

Also, I think you are going to need a longer prop - 76" minimum for 2 or 3 blade to get the most out of your set up :salute:
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1999 14ft Alumitech deckover. ZZ502. 2.37 Stinger. 4 blade WW Falcon Prop

loudmouse
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Re: Cam for sbc 350 and supercharger

Postby loudmouse » Mon Aug 24, 2015 8:40 am

Get a cam intended for boost. Comp has several that will work good. How much boost and what fuel are you planning for?
15' Alumitech deckover LSX TT Oxbox 84" JX 4-blade
Gas required Water optional :dontknow:
Built and Tuned by Me
14'X8' JW, Chevrolet 122CID LNF Turbo Engine, Ox box, 80" NGR 3 blade

Life is short, eat your dessert first! :downtown:

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crowhater
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Re: Cam for sbc 350 and supercharger

Postby crowhater » Mon Aug 24, 2015 9:16 am

are you doing this old school with a carb or will it be electrically controlled? I would suggest you look up ( Guerra Group, Victoria Texas ) on the internet. Pay $25.00 to have Pat run your engine plans through his different computer programs. He will send you several pages to fill out with information on your engine specs and based on the computer models it will come up with the best camshaft grind for your engine combination. Once you have the grind numbers you can use any cam manufacturer to cut your cam. I personally have done this on two different race engines in my Corvette and I was very pleased with the results. Pat is also considered by many to be the best computer tuner in the South. (Pat Guerra)

You need to explain to him that the engine will operating at 100% duty cycle because its an airboat. If he does not feel comfortable about doing the job he will tell you, he has plenty of work.
18x8 Alum, 496 BBC, 2.6 CH4, 4B 82" S-blades

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odcjohn
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Re: Cam for sbc 350 and supercharger

Postby odcjohn » Mon Aug 24, 2015 11:17 am

what blower you running, psi and how far over driven

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brad33478
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Cam for sbc 350 and supercharger

Postby brad33478 » Mon Aug 24, 2015 1:07 pm

It's a B&M 144 with 7psi pulleys. Pretty much a set up for a stock engine. Have a 750 Holley for fuel, like just run 93 octane if possible. Rest motor just stock fresh bored 30 over with cast vortec heads. Summit tech suggested that 1105 which is set up for nitrous/supercharger and it still has a decent idle, for price can't really beat it.


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12x7 deckover
B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$

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odcjohn
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Re: Cam for sbc 350 and supercharger

Postby odcjohn » Mon Aug 24, 2015 1:39 pm

that should be a decent cam for your setup but if was me id get better connecting rods it sould make close to 400 hp and 450 ft lbs stock ones probly wont hold for long

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Re: Cam for sbc 350 and supercharger

Postby pipedog » Mon Aug 24, 2015 6:54 pm

I ran a 177 with 10 psi on a 406 sbc with stock 5.7 rods with no problems. Make sure rotating assembly is balanced!
Palm Beach open hull 13'9" with 6.0 F.I. LS - Ox Box and a 3bld "R"

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brad33478
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Re: Cam for sbc 350 and supercharger

Postby brad33478 » Mon Aug 24, 2015 7:35 pm

Using stock crank, rods and just oversize stock Pistons. Shouldn't it be balanced still as it was from factory?

I am getting new performance dampner flex plate and timing chain etc. what should I do about balancing it?


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B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$

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pipedog
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Re: Cam for sbc 350 and supercharger

Postby pipedog » Mon Aug 24, 2015 8:00 pm

IF the pistons are over sized they should be heavier putting it out of balance. Look up J&J balancing and talk to them, 200 bucks well spent! and there in jupiter farms
Palm Beach open hull 13'9" with 6.0 F.I. LS - Ox Box and a 3bld "R"

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brad33478
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Re: Cam for sbc 350 and supercharger

Postby brad33478 » Mon Aug 24, 2015 10:10 pm

10-4 thanks. yeah he only lives about mile from me, think I used him awhile ago to bore atv cylinder


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12x7 deckover
B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$

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Re: Cam for sbc 350 and supercharger

Postby flying fish » Tue Aug 25, 2015 8:24 am

A ZZ4 350 makes 355 horse and 405 torque. N/A piece. I think.

Adding a 298/304 advertised duration camshaft, 750 carb, vortec heads and 7 pounds of boost. New setup gonna make 400 horse & 450 tq. Stock rods won't work and gonna use a 2.3 ratio and a 3 blade 72" prop.


I rode in a 32 ford with near same setup. Turbo 350 trans. :)
15' DB - 6.2 LSA - 4 blade 82" R - 2.52 CH-4

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odcjohn
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Re: Cam for sbc 350 and supercharger

Postby odcjohn » Tue Aug 25, 2015 9:37 am

FYI you will be almost full boost at cruse 3000rpm i wouldnt build it with stock rods your just asking for trouble

also 78" or bigger prop, 3 blade r would be good i think just my 2 cents

ask johnny at J&J hes a great guy very smart he will probly tell you the same

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Re: Cam for sbc 350 and supercharger

Postby One Eyed Gator » Tue Aug 25, 2015 9:49 am

I would think you will need a bigger 3 blade.

LSmatt has stock EFI 5.3 vortec 2:1 belt and he turn a 3 blade R 76", just as a reference. I run a 81" 2 bdl r with a carbed 5.3 and a 2:1. HP is may be 325.

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brad33478
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Cam for sbc 350 and supercharger

Postby brad33478 » Tue Aug 25, 2015 10:39 am

I was told 87 and later rods are good to about 475 hp, would 7 psi really be enough to damage them?

If so I might stick with my plain Jane cast heads to keep the power down then, I can't afford $400 on decent set of rods .

I'm going prob end up running 78" 3 blade falcon I'm just going have to redo my cage for it


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12x7 deckover
B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$

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odcjohn
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Re: Cam for sbc 350 and supercharger

Postby odcjohn » Tue Aug 25, 2015 2:52 pm

someone gave you the wrong info they will not hold 475hp ive seen then brake in stock engines. you need to just spend 230 dollars on a set of egale sir connecting rods that will hold 500hp. hate to see you put all this effort just to redo it and spend even more money

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brad33478
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Cam for sbc 350 and supercharger

Postby brad33478 » Tue Aug 25, 2015 4:44 pm

I've just come across several builds with this smaller chargers and they all using stock rods and vortec heads making much more hp than I'm going to. But I guess I should just come off my wallet more. Rotating assembly will need to be balanced after new rods right?

http://www.hotrod.com/cars/featured/116 ... 0ci-chevy/


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Last edited by brad33478 on Tue Aug 25, 2015 5:08 pm, edited 1 time in total.
12x7 deckover
B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$

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Re: Cam for sbc 350 and supercharger

Postby PAINKILLER » Tue Aug 25, 2015 5:07 pm

Psalms 101:7 No one who practices deceit shall dwell in my house; no one who utters lies shall continue before my eyes.

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odcjohn
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Re: Cam for sbc 350 and supercharger

Postby odcjohn » Tue Aug 25, 2015 5:18 pm

in all points its up to you.. But as a engine builder myself id never put stock rods in a motor making more than 350hp its just not practical for longevity plus its not in a car or truck that cruises at 1800 rpm. youll be at 3000 witch makes it worse on the bottom end creating more boost at cruise

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Re: Cam for sbc 350 and supercharger

Postby loudmouse » Tue Aug 25, 2015 6:50 pm

If you keep the engine out of detonation and the rpms reasonable the stock rotating assembly will be fine. I have ran stock 5.7 gm rods to 8000+ rpms and high 9's in the 1/4 @ 147 mph. Also sprayed with a 200 shot. They will live if the tune is on. With what I have done if you have the money to build a better engine then by all means do so, and if not tread cautiously but don't be scared to carry on with your build.
15' Alumitech deckover LSX TT Oxbox 84" JX 4-blade
Gas required Water optional :dontknow:
Built and Tuned by Me
14'X8' JW, Chevrolet 122CID LNF Turbo Engine, Ox box, 80" NGR 3 blade

Life is short, eat your dessert first! :downtown:

flying fish
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Re: Cam for sbc 350 and supercharger

Postby flying fish » Tue Aug 25, 2015 8:13 pm

Reconditioning used Con Rods
Magnaflux
shot ping
Install good rod bolts
Resize
Not cost effective.

Lots of things to know to make one live.
8000 RPM and not mentioning having reconditioned is interesting in itself.
Not saying it cant be done, just interesting. :)
15' DB - 6.2 LSA - 4 blade 82" R - 2.52 CH-4

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brad33478
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Re: Cam for sbc 350 and supercharger

Postby brad33478 » Tue Aug 25, 2015 8:43 pm

Well took your guys advice ordered some eagle press in rods from summit $240 not too bad


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12x7 deckover
B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$

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skinny99
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Re: Cam for sbc 350 and supercharger

Postby skinny99 » Wed Aug 26, 2015 2:21 pm

Just an FYI. I have a lots of experience with those Eagle rods. They are decent piece for the money. The rod bolt are very durable but need to be stretched multiple times before final assembly torquing and must use the ARP lube. We are mandated by rules to use our Circle track engines and have turned 1000's of laps at over 7000RPM making close to 500hp.
Successful people do what others won't or can't!

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brad33478
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Re: Cam for sbc 350 and supercharger

Postby brad33478 » Wed Aug 26, 2015 5:11 pm

Thanks for the tip skinny


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12x7 deckover
B&M 144 supercharged 355 sbc
2.3:1 Blue Lightning belt reduction
ISO 78" 3 blade WW falcon $$


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