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  #31 (permalink)  
Old 12-05-2013, 07:40 AM
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I'd be interested to know how far the pistons were below deck for that compression calculation. those numbers seem idealized for nominal values (deck height, stack height, etc.). you might be working with 8.5 or 9.5:1, I'd look into that.

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  #32 (permalink)  
Old 12-05-2013, 11:22 AM
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ya im thinkin now that they werent .060 in the hole, i remember measuring it but that was july and i didnt write down anything (a good engine build would lol) but i know it can and has been documented that this happends with 400's so its possible. im finding out this is a good time of year to buy engine parts. seen a brand new set of eagle 5140 6" rods for $150, might hafta buy them if its worth while....
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  #33 (permalink)  
Old 12-05-2013, 12:08 PM
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The only way you could be .060 in the hole with a stock rod & deck hgt would be if someone used a piston with a pin hgt of 1.560,which is a 350 piston pin hgt.Even if it has been rebuilt with cheap "rebuilder's pistons",you would still only be .045" deep on an undecked block.

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  #34 (permalink)  
Old 12-05-2013, 12:33 PM
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Originally Posted by jokerZ71 View Post
The only way you could be .060 in the hole with a stock rod & deck hgt would be if someone used a piston with a pin hgt of 1.560,which is a 350 piston pin hgt.Even if it has been rebuilt with cheap "rebuilder's pistons",you would still only be .045" deep on an undecked block.
Stock compression height piston for a 400 is 1.560".
1.875" crank radius, 5.565" rod and 1.560" piston = 9.000" stack, leaving a piston deck height of 0.025".
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  #35 (permalink)  
Old 12-05-2013, 01:07 PM
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Quote:
Originally Posted by techinspector1 View Post
Stock compression height piston for a 400 is 1.560".
1.875" crank radius, 5.565" rod and 1.560" piston = 9.000" stack, leaving a piston deck height of 0.025".
he may be accounting for the .040" gasket thickness, giving him roughly .060" P2H clearance.

I have heard of some people taking the steel shim 350 gaskets and cutting them to fit the 400 bore. I believe they are 4.100" so you'd only have to trim ~.015" to have the gasket out of the bore.

I've never done it, but If I was I'd just use a stone or cartridge roll to sand down the edge after I marked it with an awl- cutting .015" off of that thin steel will be damn near impossible to do at home otherwise.

I believe the coated felpro version is #1094, not sure of the uncoated version or the Mr. Gasket version (I prefer to use the uncoated version and spray it with gasket sealant prior to assembly- in a pinch I have used common "aluminum color" spray paint and it actually held, I prefer the copper stuff though.
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  #36 (permalink)  
Old 12-05-2013, 01:14 PM
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Quote:
Originally Posted by techinspector1 View Post
Stock compression height piston for a 400 is 1.560".
1.875" crank radius, 5.565" rod and 1.560" piston = 9.000" stack, leaving a piston deck height of 0.025".
Sorry bout that..I forgot to account for the .060 he said he was in the hole.Trying to work & do this too.Multi-tasking !!! LOL.
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Old 12-05-2013, 02:57 PM
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no i didnt measure with the head gasket on lol, 400 pistons are down in the hole more than the other small blocks, chevelles.com covered pretty good, google it.
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  #38 (permalink)  
Old 12-05-2013, 05:25 PM
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You've got a weird stack up there for sure.To my knowledge all stock SBC blocks are 9.025.You either have the wrong piston,rod,or,crank.I have heard of Old Timers flycutting piston tops to lower CR.I would definitely get it figured before I bolted a set of heads on.
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  #39 (permalink)  
Old 12-05-2013, 06:40 PM
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The engine was never tore into untill I got it. I bought it from a coworker who had it for 10 years and he bought it from and old guy he knew that sold him the rotted plow pickup it was in
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  #40 (permalink)  
Old 12-05-2013, 07:13 PM
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this thread has gone way off track. The heads might be a great deal? maybe make a new board and ask if you could use them on your engine and post all the specs(exact,not guesses),see where that thread goes?
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  #41 (permalink)  
Old 12-06-2013, 06:50 PM
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Well big things happend today. I looked at craigslist on lunch and as we speak I just bought a holley 3310-1 780cfm carb for $60, a eddy performer rpm for $40. And this is a gamble but bought a comp xe 274 used for $30, I'm gona be smart and buy new lifters and the plan from here on out is use a .020 steel shim head gasket modified to fit the 400 and run it.
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  #42 (permalink)  
Old 12-06-2013, 07:52 PM
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engine is going to the junk pile soon,,,good luck
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  #43 (permalink)  
Old 12-06-2013, 09:04 PM
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Go f-u-c-k yourself guy
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Old 12-06-2013, 09:54 PM
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A used flat tappet cam is just plain dumb....I'm a huge "budget" kinda guy and my junk usually works pretty well for the pennies I spend....but some things you just don't do.....used flat tappet cams, especially aggressive ramp designs....well Vinnie hit the nail on the head bud.
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  #45 (permalink)  
Old 12-06-2013, 10:10 PM
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Go ******* yourself guy
Some day you will have the wisdom to see reality for what it is. Today is not that day.
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