Snow Flake Head 454 Dyno Results....... - Page 2 - Chevelle Tech
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post #16 of 40 (permalink) Old Dec 21st, 18, 9:07 AM
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Re: Snow Flake Head 454 Dyno Results.......

Quote:
Originally Posted by StevenS View Post
That sucker looks real fat. I guess it liked a lot of fuel.
02's weren't turned on for that pull.

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post #17 of 40 (permalink) Old Dec 21st, 18, 9:09 AM
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Re: Snow Flake Head 454 Dyno Results.......

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Originally Posted by steelcomp View Post
088 casting
Correction...077 casting.

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post #18 of 40 (permalink) Old Dec 21st, 18, 9:11 AM
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Re: Snow Flake Head 454 Dyno Results.......

I gotta say, a 10:1 454 w/077 heads and that cam making 575 HP is impressive in my book. Nice combo that will be a blast to drive and have the ability to get into the high 10's/low 11's with a well sorted car.
JMHO
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post #19 of 40 (permalink) Old Dec 21st, 18, 9:19 AM Thread Starter
 
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Re: Snow Flake Head 454 Dyno Results.......

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Originally Posted by mr 4 speed View Post
I gotta say, a 10:1 454 w/077 heads and that cam making 575 HP is impressive in my book. Nice combo that will be a blast to drive and have the ability to get into the high 10's/low 11's with a well sorted car.
JMHO
The Ol school cam has proven itself to be very well suited for the the OEM headed BBC running around out there.
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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 #20 of 40 (permalink) Old Dec 21st, 18, 9:28 AM
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Re: Snow Flake Head 454 Dyno Results.......

Chris, what is the maximum recommendation for the 5374 lifters? Will they work with the .620/.600 Clay smith cam or is it time to step up?
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post #21 of 40 (permalink) Old Dec 21st, 18, 9:45 AM
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Re: Snow Flake Head 454 Dyno Results.......

It was kind unfortunate, and very fortunate at the same time, for the owner. He had sent us the long block with heads torqued on, cam installed, and all I was supposed to do was check the degree on the cam and do the valve train geometry, measure for pushrods, install the pan and finish up the motor for dyno. Well, the heads had green painters tape over the intake ports and were supposed to be fresh form the machine shop. When I pulled the tape off, this is what I found when I looked in the ports:



So I contacted the owner and he said lets pull the heads off and please check them out...





Notice how the head gasket doesn't even seal on one end of the head. They were pretty sad. Horrible, in fact.
We installed liners in all the guides (retained the factory 3/8 valves), installed new larger intake seats, gave them a fresh valve job and surface and re-assembled with new springs, retainers and locks. Valve job depths all get equalized to within .001" (after surfacing) and installed height on springs is within .005 high to low (+/-.0025"). We have springs in bulk so I sort through them and get springs all within 5# high to low (+/- 2.5#). We do this to every set of heads that leaves the shop. The ex seats on these heads were the hardest thing I've ever cut and actually needed to be hit with a stone for final finish. Probably Stellite. In the end, with our valve job and additional back cut on the intake valve, they turned out to be a real nice set of very clean, unmolested heads and seemed to work just fine.







(before I took them apart)



On the dyno


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Last edited by steelcomp; Dec 21st, 18 at 10:09 AM.
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post #22 of 40 (permalink) Old Dec 21st, 18, 10:29 AM
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Very nice Scott. Wish I had clearance for a Vic Jr
What did you use for oil pan , tray ??

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post #23 of 40 (permalink) Old Dec 21st, 18, 10:46 AM Thread Starter
 
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Re: Snow Flake Head 454 Dyno Results.......

Quote:
Originally Posted by bracketchev1221 View Post
Chris, what is the maximum recommendation for the 5374 lifters? Will they work with the .620/.600 Clay smith cam or is it time to step up?
.375 lobe lift
6500 rpm Max
150/400 spring rate

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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 #24 of 40 (permalink) Old Dec 21st, 18, 10:56 AM
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Re: Snow Flake Head 454 Dyno Results.......

Quote:
Originally Posted by CDN SS View Post
Very nice Scott. Wish I had clearance for a Vic Jr
FYI, TC'er B433 Brian fit a modified Vic Jr under the stock hood of his 66 Chevelle. There is another thread in the performance section about 67 hood clearance where he discusses the modifications.
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post #25 of 40 (permalink) Old Dec 21st, 18, 11:02 AM
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Re: Snow Flake Head 454 Dyno Results.......

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Originally Posted by CDN SS View Post
Very nice Scott. Wish I had clearance for a Vic Jr
What did you use for oil pan , tray ??
Pan is a Summit/Moroso deal. It's claimed to be 8" deep but actually 8.5". The pickup they recommend (Moroso p/n) leaves 1"+ of pickup to pan clearance so we got one from Stefs. This is still about 5/8 clearance with a gasket on the pan. Std volume Melling pump.
I'm guessing the slight drop in pressure is before oil starts getting back in the pan and the level drops some. I think I had 6 qts total. Might want 7. We also found out the dyno is reading about 7-8# lower than it should.

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post #26 of 40 (permalink) Old Dec 21st, 18, 11:22 AM
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Re: Snow Flake Head 454 Dyno Results.......

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Originally Posted by cstraub View Post
.375 lobe lift
6500 rpm Max
150/400 spring rate
I think I could pull it off.

Ray


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post #27 of 40 (permalink) Old Dec 21st, 18, 11:30 AM
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Re: Snow Flake Head 454 Dyno Results.......

HOLY COW! Scott's the pro so I'm sure the're not that great to him , yet... so far the best heads I've ever had on my car were well prepped 074s. 118.75 mph worth of head. They were drama prone, to be sure, which is why I offed them. But can make some good power, even in a short stroke 433. Those were fugly prepped. Like high school shop class crap, chatter, etc. Wow.

P.S> I hope to get some "good heads" next year and wake the beast back up.

NICE WORK FELLAS!


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Quote:
Originally Posted by CDN SS View Post
Very nice Scott. Wish I had clearance for a Vic Jr
What did you use for oil pan , tray ??
Brian is as careful and fastidious as you Bill. I read some of that thread, it takes a bit of fiddling to be sure.

MERRY CHRISTMAS ALL!
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post #28 of 40 (permalink) Old Dec 21st, 18, 11:34 AM
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Re: Snow Flake Head 454 Dyno Results.......

Just curious. Is the aluminum alloy in these newer "snowflake" heads better than the old heads we used back in the '70's?

Did the custome already have these heads?
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post #29 of 40 (permalink) Old Dec 21st, 18, 11:43 AM
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Re: Snow Flake Head 454 Dyno Results.......

Quote:
Originally Posted by jackie schmidt View Post
Just curious. Is the aluminum alloy in these newer "snowflake" heads better than the old heads we used back in the '70's?

Did the custome already have these heads?
What newer snowflake heads are you referring to? Todays GM heads?

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post #30 of 40 (permalink) Old Dec 21st, 18, 11:52 AM
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Quote:
Originally Posted by dell72 View Post
Quote:
Originally Posted by CDN SS View Post
Very nice Scott. Wish I had clearance for a Vic Jr
FYI, TC'er B433 Brian fit a modified Vic Jr under the stock hood of his 66 Chevelle. There is another thread in the performance section about 67 hood clearance where he discusses the modifications.
Wont work for me I have the factory Cowl Plenum air cleaner it’s 1 1/4” taller than the stock open element assembly I had to machine 1/8” off carb pad on the air gap to clear
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Tremec by Liberty[/FONT]

Foxwell 475 BBC 688hp /610 tq
9.5 cr pump gas Brodix heads by Foxwell Straub hyd Roller
Crusin / Track video
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