Re: Block questions- deck surface and square specs street/strip
[Re: radar]
#2538020
08/18/18 08:52 AM
08/18/18 08:52 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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The problem is that in order to clean it up, you will end up with less than .043" on the even deck. It will have to be skimmed from one end to the other, so you might end up .040"-ish on that side, unless you clean both sides evenly. For a street motor, I think I would leave it and start building it. For Felpro gaskets, your surface finish is probably fine. If you were using an MLS type gasket, I might take a closer look.
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Re: Block questions- deck surface and square specs street/strip
[Re: radar]
#2538066
08/18/18 11:57 AM
08/18/18 11:57 AM
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Joined: Aug 2011
Posts: 2,904 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,904
Pattison Texas
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I would NOT use 1009 gasket, they can have an issue, the fire ring hanging into the combustion chamber, check that VERY close, I would use Cometic
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Block questions- deck surface and square specs street/strip
[Re: radar]
#2538080
08/18/18 12:29 PM
08/18/18 12:29 PM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,908
Nebraska
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X2 on the 1009. Figure out your head gasket then decide on how much to deck it. I would shoot for .040 piston to head and use a cometic gasket with bigger bore size than 1009. Maybe use a .051 cometic and mill block about .014.
Last edited by 4406bbl; 08/18/18 12:42 PM.
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Re: Block questions- deck surface and square specs street/strip
[Re: radar]
#2538731
08/19/18 10:35 PM
08/19/18 10:35 PM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,908
Nebraska
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1970 hp block it is from my 6bbl car, numbers block. Both front cylinders are .016 in the hole, both rears are .017 in the hole. Never milled. An .024ish head gasket would mean no milling. 1009 will not work on this block, has chamfer, the non hp 69 was fine with 1009 same.030 over bore and pistons. So it is real hit and miss.
Last edited by 4406bbl; 08/19/18 10:43 PM.
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Re: Block questions- deck surface and square specs street/strip
[Re: radar]
#2539763
08/21/18 08:20 PM
08/21/18 08:20 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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I never had a block shot peened before- this 400 block had about three gallons of hemi orange spraypaint on it so my machine shop said peening was the way to go to get it clean. The block is impressive looking like a new casting but the surface is definitely rough compared to a fresh cut deck- more like as cast type finish.
SO - the decks were not cut after the airless shot cabinet? Did they protect the main bores and lifter bores?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Block questions- deck surface and square specs street/strip
[Re: radar]
#2542045
08/27/18 03:17 PM
08/27/18 03:17 PM
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Joined: Jul 2007
Posts: 1,686 Philadelphia
radar
OP
top fuel
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OP
top fuel
Joined: Jul 2007
Posts: 1,686
Philadelphia
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Howdy
Delayed response- I went camping for a week with my family. World’s End state park in northern PA is awesome but there is no cell service for miles which is also kind of awesome.
The pistons are forged and set with 5 thou clearance to the bores per mfg spec. They are pretty short for the 400/512 stroker. I would be nervous about running a super tight quench but I’ve only built a handful of v8 motors with quench. On paper I am super happy with how my motor is measuring out. I think 10.2 compression, .044 quench, with aluminum heads and a mild flat tappet should help steer me away from ragged edge tuning nightmares on the street.
The last motor I built was a 318 for my ramcharger. I did a stock shortblock, fresh top end, headers, RV cam, aluminum dual plane, and a four barrel with msd ignition. Kind of like a home brewed tow package. I really enjoyed how easy it was to put together and tune. This motor I am trying to go a step hotter but use the cubes to move my power way down the rpms where stamped rockers and wimpy springs will happily do the job. I probably would have been perfectly happy with a smog 440 but if I’m going to rebuild a motor it is real hard to argue with 440 source stuff- 72 extra cubes, forged bottom end, and stealths for small money.
The bearing and lifter surfaces did get covered when it was peened but not the deck.
I have heard the big blocks often need the cam bearings shaved by a cut up old cam so I decided to install the cam bearings after the mains were torqued in case the block moves around and got another nice surprise when the cam stabbed in and spun nice and smooth.
Hopefully in a few weeks I’ll have this thing hung in the chassis ready to break in.
Thanks for your thoughts and questions I am always learning more about this stuff!
Radar
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