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  #1  
Old Nov 4th, 08, 6:10 PM
darkostoj darkostoj is offline
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Darko
 
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Location: Rochester, MI
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Default Pick my cam for my blown sbc 350....shooting for 700ish horse

alright I currently have the summit k1107 hyd flat in there right now. I'm still building the motor and i'm debating on going to a smaller cam (summit k1105) since this one seems a little too big. Here are the specs on the cams

k1107
234/244 @.50 .488/.510 lift 114 lsa (in motor now)

k1105
224/234 @.50 .465/.488 lift 114 lsa (thinking about buying)


these are the specs on the motor

67 camaro
355
8.7:1 comp oringed block and copper head gaskets
trw forged dished blower pistons .040 quench
afr 195 eliminators 64cc chamber
summit k1107 cam (specs above)
15-20lbs of boost on a 671 blower (well get it refreshed & teflon strips installed)
h beam rods
steel crank
custom 200r4
9" with 3.70 gear and a lock right


This is primarily going to be a street car and I was thinking i'd probably gain a good amount of power on the bottom end by not sacrificing too much up top with the smaller cam....whats everyones thoughts?
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  #2  
Old Nov 4th, 08, 6:38 PM
dirtlips408 dirtlips408 is online now
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Ron
 
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

I like the one you already have in it!
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  #3  
Old Nov 4th, 08, 6:55 PM
77 cruiser 77 cruiser is offline
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Jim
 
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

Or you could go bigger yet with the amount of boost you're planning, a blower covers a lot of lo-end power/driveability issues associated with big cams.
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77 Monte
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  #4  
Old Nov 4th, 08, 8:27 PM
ironhead ironhead is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

Not a big fan of squishy lifters underneath an overdriven 6-71.Loss of valvetrain control is greater and the last thing you want to do is hang an intake valve open under a supercharger = kaboom.Mechanical all the way.Save the hydraulic cam for the n/a engine.
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  #5  
Old Nov 4th, 08, 8:32 PM
david_396 david_396 is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

That's a whole lot of boost for a street car.
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  #6  
Old Nov 4th, 08, 9:09 PM
Chief fat nutz Chief fat nutz is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

DAUM! I would suggest only by opinion and experience, run a light weight piston with a smaller ring.

Im running the Mahle forged/coated pistons and they are nice and light. They will take the abuse over and over again.

The cam you have isn't bad,its actually the same grind I run in my 355/AFR 210 heads. Its a Elgin cam and its slightly different. It might be identical and the specs might have changed just to make it a different cam on paper.

I THINK this cam we are running is about at its limits of 600hp on gobs of boost. I'd go with a hyd.roller if you want more. Hyd.rollers are gonna live longer and support more abuse than a flat tappet. I only spin my 355 to 6400 max and 7psi boost.
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  #7  
Old Nov 4th, 08, 9:14 PM
Tokyo Torquer Tokyo Torquer is offline
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Mike
 
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

You gotta be talking an alcohol motor. if not, i suggest you start from scratch as it is all, all wrong. That boost is not realistic for pump gas and that compression, and hydraulic lifters will not handle that boost level even if you could run that boost level on the street w/o alcohol. Why are you chosing the 65cc heads when AFR has them in 75cc? (is it what you already have?) A streetable pump gas blown 355 with those heads and that cam is not a 700hp motor. You are talking solid roller and huge heads and a workable boost/ compression level for pump gas to reach that hp level with a little 355. Otherwise, think 580-620hp.

With Cometic MLS gaskets you do not need o-ringing with any reasonable/ workable street boost.
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1973 RS Z28: 401ci Dart Little M, Littlefield 8-71 supercharger @14lbs boost, Callies Magnum crankshaft, Lunati Pro-Mod rods, JE pistons, 7.8:1 compression, AFR 227 Comp heads, T&D 1.6 shaft rockers. Reed solid FT cam (240/250@.050, .523/.542 lift, 112 LSA), QFT 750 carbs, Tremec TKO-500, Lemons headers, Moser 12 bolt, 33 spline axles & 3.42 gears
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  #8  
Old Nov 4th, 08, 9:16 PM
Tokyo Torquer Tokyo Torquer is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

hydraulic roller is much worse with high roots boost
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1973 RS Z28: 401ci Dart Little M, Littlefield 8-71 supercharger @14lbs boost, Callies Magnum crankshaft, Lunati Pro-Mod rods, JE pistons, 7.8:1 compression, AFR 227 Comp heads, T&D 1.6 shaft rockers. Reed solid FT cam (240/250@.050, .523/.542 lift, 112 LSA), QFT 750 carbs, Tremec TKO-500, Lemons headers, Moser 12 bolt, 33 spline axles & 3.42 gears
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  #9  
Old Nov 4th, 08, 9:23 PM
ironhead ironhead is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

Quote:
Originally Posted by Tokyo Torquer View Post
hydraulic roller is much worse with high roots boost
x2^
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8-71 blown 461 Rat on E-85
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  #10  
Old Nov 4th, 08, 9:40 PM
darkostoj darkostoj is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

yep this is going to be a E85 motor...thats why I went with the 64cc heads and the compression up around 8.7:1

well now that i'm thinking about it...solid may be the way to go....but then on the other hand I already have the cam and lifters and they cost me a whopping $90 for the set
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  #11  
Old Nov 4th, 08, 10:23 PM
lemonice lemonice is offline
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Talking Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

whats wrong with hydralic liffters in a blown motor.? i have been running a 396 with a 671 for over 10 years. i just pulled the heads today and cam/liffters all look new. the reason i ask is i am thinking about replacing the 396 with a 496 with dish pistons, and another hyd blower cam. this motor is in my prostreet 55 and does not go to the drag strip. its just a cruiser.
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  #12  
Old Nov 4th, 08, 10:25 PM
darkostoj darkostoj is offline
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Darko
 
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

it can be hard to keep the valves from floating at higher rpm with the hyd lifters
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  #13  
Old Nov 4th, 08, 11:02 PM
cuisinartvette cuisinartvette is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

You wont care about a great deal on a $90 cam set if you blow ventilation windows through the side of your block . Listen to these guys, they are trying to help.
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  #14  
Old Nov 5th, 08, 12:04 AM
Tokyo Torquer Tokyo Torquer is offline
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Mike
 
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

with E85, if I wanted to go for 700hp and the basic build your suggesting, I would like to see at least 210 heads and a bigger solid flat tappet that will make power winding to 6500+ and around 15 or 16 pounds of boost. at 700 hp, you want to see some good parts for relability and I hope it is not a Weiand 6-71 that you are trying to make more than 15 pounds of boost with.

I know some guys that push just over 12 pounds of roots boost with hydraulic FT lifters and some decent RPM with no problems, but I dont see much higher than that. I think for your average hot rod blower motor that comes with a hydraulic roller, they are fine with 7 or 8 pounds of boost, maybe even up to 10 pounds as long as you dont try to push it over 6k rpm. Anymore requires careful planning with your valve springs and dancing on the edge of valve float. Trying to handle the boost levels you mentioned, I wouldn`t attempt. I am running 15 pounds of boost and a HR cam and keep it to 6k rpm, but I would not recommend it to anyone as I had lots of issues and painful learnings along the way and I do it with 175 pounds of set pressure and Morel lifters. My next motor will have a solid cam if I try to run this boost level again, so I dont have to worry again about an intake valve hanging open and a kaboom in my intake, which is not such a nice thing to happen to your blower motor.
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1973 RS Z28: 401ci Dart Little M, Littlefield 8-71 supercharger @14lbs boost, Callies Magnum crankshaft, Lunati Pro-Mod rods, JE pistons, 7.8:1 compression, AFR 227 Comp heads, T&D 1.6 shaft rockers. Reed solid FT cam (240/250@.050, .523/.542 lift, 112 LSA), QFT 750 carbs, Tremec TKO-500, Lemons headers, Moser 12 bolt, 33 spline axles & 3.42 gears
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  #15  
Old Nov 5th, 08, 9:09 PM
ironhead ironhead is offline
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Default Re: Pick my cam for my blown sbc 350....shooting for 700ish horse

Quote:
Originally Posted by lemonice View Post
whats wrong with hydralic liffters in a blown motor.? . its just a cruiser.
nothing wrong at all with mushy lifters in a blown cruiser.
Darko is not building a cruiser..he wants a boulevard bruiser for the street/strip.
If he obtains his 700 hp goal...most likely he will blow the tires off at least once and send the valvetrain into float with the heavy hyd lifter and its tendancy to pump up if lofted off the nose.This effect will have the intake valve held off its seat when the plug fires off before tdc and the flame front can and will revert back into the blower manifold.Not a good thing.
With a mechanical cam..you can run more spring pressure without fear of bleeding down a hyd lifter at rest..the solid lifter never pumps up when lofted and is easier to control at higher rpm due to reduced weight.
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8-71 blown 461 Rat on E-85
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