Best cam setup for this 454 big block - Chevelle Tech
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post #1 of 32 (permalink) Old Aug 27th, 11, 11:09 AM Thread Starter
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Michel
 
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Best cam setup for this 454 big block

Hello,

After a long vacation i went on with restoring my chevelle.

I have removed the engine from the car and i am looking for a good cam with distributor and ignition.

I have the following setup allready

The intake is a aluminium gm hi perf intake gm3933163 and the cylinder head is casting 6272990 with 118cc Replacement Rectangular port 325cc intake. I have 1 3/4 inch alu headers with a 3 inch collector and a holley 830cfm NASCAR carb.

So what cams will be best too use with this setup and what distributor and ignition do you recommend to me.

Thx for your help.
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post #2 of 32 (permalink) Old Aug 27th, 11, 11:57 AM
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post #3 of 32 (permalink) Old Aug 27th, 11, 3:00 PM
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Re: Best cam setup for this 454 big block

hydraulic or solid, flat tappet or roller?

1970 Chevelle - Best time at the WCCG 12.749 @ 108.606, 2.011 60' on street tires!

427 BBC, 215 heads, 2.19/1.88 valves with some port work, 60212 Lunati Hyd Roller, 3310 Holley 750, Performer RPM intake, TH350 with shift kit, 3.55 gears 12 bolt posi, Pypes 3 inch kit, it's alive... again!!!
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post #4 of 32 (permalink) Old Aug 27th, 11, 5:19 PM
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Re: Best cam setup for this 454 big block

Quote:
Originally Posted by mr 4 speed View Post
manual or auto trans? what gear?
Quote:
Originally Posted by Stikman33 View Post
hydraulic or solid, flat tappet or roller?
& what are you doing with the car Street or RACE???

72 ss 454 "W" code,w/cowl induction (how many left?)
matching # LS5 454+.060" 9.2 :1, 2.19/1.88 valves,Comp HR cam 289/295 234/240 .613/.613 110* (dyno'd @ 557hp @ 5400 & 583tq @ 4100)
matching # M22 w/CF dual friction clutch.
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Garage find parked from 1978-2004

http://macswebs.com/ls5registry/bal/bal.htm
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post #5 of 32 (permalink) Old Aug 28th, 11, 5:08 AM Thread Starter
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Michel
 
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Re: Best cam setup for this 454 big block

The axle ratio is 4.10 and i am having a TH400 automatic. Just wanne make it a street/strip car.

Here is a pic of my dyno sheet form last monday.

You can see how horsepower is dropping when the car is going faster. Also the th400 is not performing well.

I got 392 horsepower on the wheels.


Last edited by michel1972; Aug 28th, 11 at 2:05 PM.
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post #6 of 32 (permalink) Old Aug 29th, 11, 3:12 AM Thread Starter
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Michel
 
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Re: Best cam setup for this 454 big block

Somebody any idea about the best cam , distributor and ignition?
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post #7 of 32 (permalink) Old Aug 29th, 11, 10:56 AM
 
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Re: Best cam setup for this 454 big block

How much rpm do you want out of the engine? Hyd roller or Solid roller? What rocker arm ratio is on the engine now?

Chris Straub
Mfg Performance Parts
www.straubtechnologies.com
www.distributorgears.com

Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #8 of 32 (permalink) Old Aug 29th, 11, 12:08 PM Thread Starter
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Michel
 
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Re: Best cam setup for this 454 big block

Quote:
Originally Posted by cstraub View Post
How much rpm do you want out of the engine? Hyd roller or Solid roller? What rocker arm ratio is on the engine now?
Good question. I dont know that. The guy that built the car is in jail.

How can i find out if i have a Hyd roller or Solid roller and how can i find out what the rocker arm ratio is.

When the engine goes above 4500 rpm it is losing power. So i suggest that the cam i am using now is not for higher rpm's
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post #9 of 32 (permalink) Old Aug 29th, 11, 12:16 PM
 
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Re: Best cam setup for this 454 big block

You are going to have to get into the engine see what you have. The heads are quite large so the engine won't start feeling good until after 4000 rpm but it is a stick car. If you want a max of 6500 or so I would go hyd roller. If you want to rev the engine higher then that we need to go solid roller. I can supply you the whole kit for either. If you need an idea on pricing PM me. You can check my reputation on this board, its pretty good.

Chris Straub
Mfg Performance Parts
www.straubtechnologies.com
www.distributorgears.com

Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #10 of 32 (permalink) Old Aug 29th, 11, 2:39 PM Thread Starter
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Michel
 
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Re: Best cam setup for this 454 big block

Quote:
Originally Posted by cstraub View Post
You are going to have to get into the engine see what you have. The heads are quite large so the engine won't start feeling good until after 4000 rpm but it is a stick car. If you want a max of 6500 or so I would go hyd roller. If you want to rev the engine higher then that we need to go solid roller. I can supply you the whole kit for either. If you need an idea on pricing PM me. You can check my reputation on this board, its pretty good.
What do you mean with " the engine won't start feeling good until after 4000 rpm but it is a stick car"

Do you mean that these heads are made for higher rpm? So the engine will produce some power when i go above the 4000 rpm?
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post #11 of 32 (permalink) Old Aug 29th, 11, 3:46 PM
 
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Re: Best cam setup for this 454 big block

The heads are quite large for that CID so the manual tranny will help with this. A small roller cam can be used to broaden out the powerband and give me more useable power but we have to know what is in the car now.

Chris Straub
Mfg Performance Parts
www.straubtechnologies.com
www.distributorgears.com

Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #12 of 32 (permalink) Old Aug 29th, 11, 4:18 PM Thread Starter
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Michel
 
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Re: Best cam setup for this 454 big block

Quote:
Originally Posted by cstraub View Post
The heads are quite large for that CID so the manual tranny will help with this. A small roller cam can be used to broaden out the powerband and give me more useable power but we have to know what is in the car now.
Ok,

I have a th400 automatic and not a manual tranny.

But do you mean that these heads are made for the higher rpm range? When will these heads give their best performance? above or below 5500 rpm?

So to find out what i have now i have to open my 454 engine and find out.
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post #13 of 32 (permalink) Old Aug 29th, 11, 4:29 PM
 
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Re: Best cam setup for this 454 big block

Ok thought I saw manual. Heads are best suited with that kind of runner volume to make power starting above 4000 rpm. Need to know what you have on the inside of engine now so we would know what you need to accomplish your goals.

Chris Straub
Mfg Performance Parts
www.straubtechnologies.com
www.distributorgears.com

Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #14 of 32 (permalink) Old Sep 3rd, 11, 4:16 PM Thread Starter
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Michel
 
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Re: Best cam setup for this 454 big block

Quote:
Originally Posted by cstraub View Post
Ok thought I saw manual. Heads are best suited with that kind of runner volume to make power starting above 4000 rpm. Need to know what you have on the inside of engine now so we would know what you need to accomplish your goals.
Today i opened my engine and found out that i have Hydraulic Roller Tappet in the engine.

What else do you need to know to tell me what the best cam is for this setup.

I wanne start fresh and want to flow the 6272990 heads and put new valves in it.
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post #15 of 32 (permalink) Old Sep 4th, 11, 7:38 AM
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Gene
 
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Re: Best cam setup for this 454 big block

Michel, I know you dont have access to a wide assortment of Chevy BB heads over there, but do flow the 990's. You may be somewhat disappointed in them, so the right cam will be critical. only experience with 990s on a 427, they were too big everywhere. ( so far the engine has made it best power with small, highly ported rectangulars so a rect head worked best, just not these unported ones.).

But you have 1/4" longer stroke to create more velocity.

Gene
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