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Old 03-04-2008, 05:46 PM
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cc's in valve relief- 454

Hi
Does anyone know the cc count for 2 valve reliefs
in flat top .030" 454 pistons????
Is it 4.9 cc's..?
I am just trying to figure out my CR after resurfacing
these 101cc heads they are pretty rough so I am thinking
after a few swipes on the plainer I may be down to 100cc's
or maybe 99cc's
Thank you

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Old 03-04-2008, 06:24 PM
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cc's in Pistons

F-TBIRD 88"
Thanks for the reply.
So with 4.28" bore (.030 over), 4.00 stroke,
0.0 deck height, 5cc piston height and 100cc
chambers I am looking at 9.24:1 CR.
On a BBC is this so,so for performance with headers,
double plain intake, good cam? or should the CR be more?
I have heard that BBC do not need a lot of CR to put out
lots of HP and torque.
Thanks again
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Old 03-05-2008, 10:17 AM
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CR w/Flat Top & Closed Chambers

F-BIRD'88
Thanks again. The problem I see with milling heads is
that I may have alignment issue with my intake???
I originally told my mechinist to take .060" off, but he
was hesitant due to alignment. The valves are out and he
has bead blasted them so now is the time to mill the heads.
I do not have all the formulas, but near as I can figure...if
I take 0.060" I will end up with 94.94cc chambers.
Plus a .030" over 454 bore should be 4.28" or 4.3775"???not sure
F-BIRD, I talked to you before and you suggest the Isky #396245,
Z45 grind solid lifter cam. I decide not to go with solid due to maintenance
and valve clearance issue that may pop up. I want the 11-601-4 Compcam
Thumper hyd lifter...just because hyd will be less maintenance. I need to tell
my guy today how much to mill if anything other than resurface. your help
would be great or anyone elses help...this is not my strong suite.
Thank you much
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Old 03-05-2008, 10:42 AM
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if you are doing a straight decking of the head then you may see some misalignment of the intake, so you would want to take the appropriate amount off of the intake mating surfaces on the front and back of the block.

You could have him angle mill the heads though and this would leave the area underneath the intake runners relatively unchanged. As long as he machined the correct angle into the head where the intake mounts you should be good to go.
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Old 03-05-2008, 10:57 AM
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CR, mill, Close Chamber

Double V23
Thanks for the advice.
Wouldn't it be easier "IF" I run into a problem to
just take same amount mill off heads, off the aluminum intake
front and back so she rest properly.
Still can't figure EXACTLY how much to mill to achieve say
94cc's chambers +/- I was thinking 0.60"
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Old 03-05-2008, 11:04 AM
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If I remember correctley it is about .008" per cc.
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Old 03-05-2008, 11:45 AM
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CC's off close Chmaber w/flattop

Thanks alot "RPM"
I am going to trust you and do the math to get
down to 94cc's which is roughly .048". I may just
go 0.060" like I was going to do in the first place.

Advice...?
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Old 03-05-2008, 12:37 PM
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Here's an article I wrote for the wiki. Once you get the heads on and torqued down for the final time, follow this procedure.
http://www.crankshaftcoalition.com/w...ad%2C_internal
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Old 03-05-2008, 12:55 PM
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CC's for Close heads, milled

Thank you "techinspector1"
I printed you article. Do you know anything about how much to mill
heads? I have BBC 063's which are 101cc's. I have flat top pistons
with 2 valve reliefs. I was going to mill these things .060" to get to
roughly 94cc's which should bump my CR up to 9.5:1-9.8:1.
Is this sound correct to you?
Thank you
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Old 03-05-2008, 01:04 PM
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I think RPM hit the nail on the head pretty squarely at 0.008" per cc for a BBC. On most small blocks, it's around 0.007" per cc.

I very strongly suggest that you get a burrette, stand, some clear plexiglass or lexan and pour the heads yourself.
http://store.summitracing.com/partde...5&autoview=sku

Once you've done your heads, spread the word that you'll cc a set of heads for $35. Three sets and your equipment is paid for. Leave a flyer at garages, speed shops, car clubs, Friday/Saturday nite car shows, etc.
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Old 03-05-2008, 01:14 PM
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CC of heads vs CR, BBC

i do not have extra money unfortunetly.
All I wanted was to increase the CR a few notchs.
Thought i would be safe in just taking a few .000"
off. They are already 101cc's which from the original heads
which were 118cc I think will help in itself, but will still be
less than 9:0 I believe. I am putting the 11-601-4 Compcam
hyd, headers, intake, 750-850cfm carb. i am not going to the
drags or Pinks..I may run it once just to see what it will do, but for
the most part it will just be the weekend warrior with the wife and/or
kids. BUT when by myself I am on it a lot and do want to blow some doors.
1965 Malibu's are pretty lite and with a BBC...
Help...?
Thanks.
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Old 03-05-2008, 02:18 PM
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I have a 65 skylark (same as the malibu) with a 496 and it is quite a wild ride when I step on the loud pedal. it is only 9.5:1 with about 600 hp. so I can vouch for the fun you are going to have.

I have to agree with the burette though. do the calculations and you may find that your compression is higher than you think.
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Old 03-06-2008, 04:25 PM
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Valve Clr w/milled heads .032" off

F-BIRD'88 thank you
The Isky solid lifter cam you suggested had a .530/.530 lift
this Compcam has.510/.495 this is what determines how close
the valve comes to the piston I thought?? The more lift, the closer
you are to the piston. They both have a 107 deg.lobe sep.
F-BIRD and anyone else please don't take me wrong I am not arguing
at all I just want to learn the ins/outs.
I think I had the intake problem you are talking about on my 396 I
had a few years back. It had all the best, but I think the heads I had bought for it were already milled because I had oil coming up from the lifter valley
through my intake/head ports and oil on plugs and oil in tailpipe. It wasn't in
excess and would burn off the plug, but was a pain in the a__ smoked slightly when you were ON it too.
So you are saying I should do the clay thing on the valve reliefs opn the piston, bolt the head down, throw a couple pushrods in and turn it over afew
complete revalutions and pull the head to see the result of the clay...? touching the clay with the valve is not bad, but if it went through the clay and touch the lowest part of the relief then there are issues???
Thank you
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Old 03-06-2008, 06:59 PM
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V/P Clearance Milled heads

F-BIRD'88 thanks again.

Sounds very complicated. The block has not been decked.
The heads however are being decked as we speak .032"
To retard the cam is that the different selections on the
cam gears offered or is that just timing via the distributor?
I sound like I know nothing. I have thrown together a lot of
engines and hot parts and IT RUNS hard to believe
Thanks
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Old 03-07-2008, 10:02 AM
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CR w/flat top pis & milled heads

Hey F-BIRD'88 thanks again.
I measured the deck height last night with straight
edge and feeler guage. Came up with .040" near as I
can tell.
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