Cam help, 177 blower on 454, looking for 600 hp - Chevelle Tech
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post #1 of 12 (permalink) Old May 27th, 05, 11:01 PM Thread Starter
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Talking Cam help, 177 blower on 454, looking for 600 hp

I really need some help picking a good cam for my 177 blown chevelle, 4bolt 454 waiting to be installed, Motor is 30 over, 781 heads with MILD port work unshrouded 2.19/1.88 valves, 9.0 - 9.25 comp, boost on blower currently is 5psi.

Car is a 72 convertable, 3:42 posi, 2200-2500 stall, 700r4, driven often, vintage air, disk brakes ect.

Currently running a 468, 9.25 comp, weiand 177 blower, with a comp xtreme 268 110 lobe sep, cam is just wrong for the blower and my heads are semi closed with 2.06 - 1.72 NO Port or bowl work, also mabey not the best heads for blower.

When I got the blower I put it on to see how it would work but my setup is not right and not taking full advantage of the blower, I want a nice street/strip cam nice chop and have a descent rpm range, 2500-6000 - 2200 - 5800 ect. My goal is TRUE 600 hp with supercharger which I believe is a goal that should be able to acheive.

thanks for the help guys
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post #2 of 12 (permalink) Old May 28th, 05, 2:11 PM Thread Starter
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Re: Cam help, 177 blower on 454, looking for 600 hp

any suggestions, help?
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post #3 of 12 (permalink) Old May 29th, 05, 4:10 AM
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Re: Cam help, 177 blower on 454, looking for 600 hp

I'm no expert but blower cams are mostly in the 114+ LSA. Look in any of the major cam manufacturers web catalogs and almost all of them have a selection of blower cams. You also didn't state what kind of grind you are interested in Hyd, solid, Hyd roller, solid roller????????

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post #4 of 12 (permalink) Old May 29th, 05, 10:48 AM
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Question Re: Cam help, 177 blower on 454, looking for 600 hp

Doesn't the wider LCA keep the blower from blowing right out past the exhaust valve at TDC overlap or something like that??

And I figure either a 250 or 256 Procharger would be better if Holley still offers the shorter manifold one just b/c of the extra volume of the BB is all.

Only mention the shorter intake one for hood clearance is all.....

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post #5 of 12 (permalink) Old May 29th, 05, 4:35 PM Thread Starter
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Unhappy Re: Cam help, 177 blower on 454, looking for 600 hp

I have been told that a 114 or a 112 is better for a street blower setup, Im needing some help getting the right blower cam for my setup. All the specs of my car are listed in the first post.

I want to get a true 600 hp which with a 468 and a 177 with 781 ported heads, bigger valves should be obtainable. I dont want to buy to small or big of a cam. The cam in my motor now is a comp xtreme 268 and I trusted the techs at summit and I learned a lesson to not always believe what they suggest. Now im asking the members of this board who I should of checked with in the first place.

Also my comp cam has the sewing machine tapping sound
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post #6 of 12 (permalink) Old May 29th, 05, 5:07 PM
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Re: Cam help, 177 blower on 454, looking for 600 hp

Chevy High Performance built a similar setup in July of 03. They used a cam for a 502 marine motor. Duration @.050 was 220 for both intake and exhaust. .500 lift, lsa was 115. Part#14096209. They had a lower comp. ratio and made 563hp & 649tq. This was on 100 octane. Let us know what you do and how good it worked. Good Luck.

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post #7 of 12 (permalink) Old May 31st, 05, 8:56 PM
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Re: Cam help, 177 blower on 454, looking for 600 hp

Hello,

If you do a search on my ID or B&M, or blower, or Commander, (.553/.571 236/246 @ .050) you will get hits on discussions about 454, 174 B&M Blower, 5 to 6 lbs boost. My ragtop is a 5spd Doug Nash stick with 3:31 posi. I really like the Crane Commander cam as it works well with my setup and sounds great. Never dyno'ed. Probably not 600HP as my goal was not a big HP number. Was after driveability and useable power with small 275 / 60 tires. Car is impossible to drive with street tires as power is off the charts as soon as you step on it. 600HP aside, a cam similar to the one I am running seems to hit your objectives.....and I can say with certanty that it drives well. My setup is modeled after B&M years ago where they got 560HP with big carb and probably a wild tune on it.

I would imagine UDHARLD, Wolfplace, and the rest of the gang can steer you in the right direction with real world experience. Plenty of great advice here.

Tons of cams available to make a big HP number..........and deliver driveability, low end torque / fun. A solid roller can easily pack the cylinders without a blower.........and make 600HP. Todays' cams, combined with a small blower, I would imagine 600 to 620HP is possible and relatively easy on parts.

Good luck. Look forward to hearing about your hotrod........Joe.
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post #8 of 12 (permalink) Old May 31st, 05, 9:29 PM
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Re: Cam help, 177 blower on 454, looking for 600 hp

The small roots blowers are suited more for producing tons of low end torque. It will likely run out of volume at higher rpms, therefor limiting your peak HP output.
Do you currently maintain boost throughout the range, or does it fall off. Are you running a timing retard?
I agree the extreme 268 is not the right choice. The blower will take care of low rpm response, so I would look to something in the 280 range, with a wide lsa. That is, as long as the blower can maintain the boost over 4K.
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post #9 of 12 (permalink) Old May 31st, 05, 10:10 PM
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Re: Cam help, 177 blower on 454, looking for 600 hp

You have more than enough port volume to make 600 hp with a blower.
You want more lobe separation/overlap and a strong exhaust side.
You may have to spin the smaller supercharger a little harder to make enough
boost.A very free flowing exhaust header and pipe will make a big impact.
After reading your original post again, I wonder why not 7-8 lbs boost?
Spin it faster baby!

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post #10 of 12 (permalink) Old May 31st, 05, 10:32 PM
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Smile Re: Cam help, 177 blower on 454, looking for 600 hp

This is why I mentioned either the 250 or 256 Prochargers only b/c they are bigger than the 177 but still some shorter in overall height for hood clearance than a 420 or 6-71, so therefore more like the mini-blowers.

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post #11 of 12 (permalink) Old Jun 1st, 05, 6:22 AM
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Re: Cam help, 177 blower on 454, looking for 600 hp

The Crane 296 Powermax (same cam, new name) is ideal for a blown motor. 296/306, 236/246, .553/.571, 114LSA??.
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post #12 of 12 (permalink) Old Jun 1st, 05, 9:00 AM
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Re: Cam help, 177 blower on 454, looking for 600 hp

I'm running a Procharger P600b making about 8 psi of boost and am making around 600 at the wheels (128 mph @3800 lbs). I'm running a hydraulic Comp nitrous cam, there are several versions the one I have is the 284nx it is: 284/305 240/253 .575/.595 113 LSA. My car picked up a lot over the Comp 292H single pattern cam I had in the car before. HTH.

Last edited by 69bowty; Jun 1st, 05 at 10:15 AM.
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