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#1
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How many cubic inches?
I have a 1972 YS block 400 that was bored 60 over and has a 455 eagle crank and 7K3 heads.
I was wondering what the cubic inches would be. Thanks |
#2
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412
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#3
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You would have a 462 cid motor.
57.77 cid per cylinder. Basically you now have a .030” over 455. The heads you have on it have nothing to do with CID.
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I do stuff for reasons. |
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#4
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Thanks,
462 cubic inches . When people ask I never know what to say without going through the whole build. |
#5
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Wallaceracing.com
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#6
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One cylinder cu. in. = bore x bore x stroke x .7854.
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#7
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4.21 stroke or 4.25 ?
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#8
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Not sure about the stroke.
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#9
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In opening post you indicated 455 Eagle crank- where did you get that info?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
#10
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I would just tell everyone it's a real strong 400 ci with lots of torque. You are running an experimental cam.
just a thought! Jim
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Jim Moshier 1971 Grand Prix 462ci SD Performance 6x heads 1962 Catalina 389 1968 Firebird 400-455 I haven't decided "If we ever forget that we're one nation under GOD, then we will be a nation gone under." - Ronald Reagan |
The Following User Says Thank You to Jim Moshier For This Useful Post: | ||
#11
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Pontiac Dude out of Brooksville FL told me. He built the engine for me. On the receipt it stated eagle 455 crank.
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#12
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As eluded to here in this thread Eagle makes two Cast Steel Crankshafts for a 455, a 4.210 stroke and a 4.250 stroke.
.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#13
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Does the receipt state what kind of rods and pistons are in it? Typically 4.25 stroke setups will use 6.8 Chevy rod and 4.21 stroke would use 6.625 Pontiac rod.
Might help narrow it down? |
#14
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Pretty sure 4.21. when I get home I'll check the receipt. Thanks
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#15
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Thanks, I'll check the receipt when I get off work.
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#16
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We putting 3.25 main cranks in 3.00 blocks now?
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"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction" 1970 Trans Am RAIII 4 speed 1971 Trans Am 5.3 LM7 1977 Trans Am W72 Y82 1987 Grand National |
#17
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Most of the Eagle cranks were 3" mains to fit in the 400 block.
(both 4.21" stroke and 4.25" stroke)
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#18
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Quote:
lol
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"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction" 1970 Trans Am RAIII 4 speed 1971 Trans Am 5.3 LM7 1977 Trans Am W72 Y82 1987 Grand National |
#19
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Mine is 4.25 stroke eagle with pontiac size rods
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) Last edited by jonmachota78; 01-21-2023 at 07:59 PM. |
#20
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So after further review...not an eagle crank. You can see from the pic that it is a Pontiac 455 crank cut fior a 400 block using "Custom Dude" main bearing conversion kit.
I haven't looked at this receipt in years and guess when I read the footnote under the crank part where it says " Eagle cranks might require extra Mallory to balance" I wrongly committed to memory that it was an Eagle crank. Wishful thinking I guess. Anyway, by looking at receipt, it appears he used the original 400 rods Crane XE268H cam Maybe this new information will help determine my cubic inches. Thanks for all the responses. |
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