Decking a 428

[gregaba]

Hi
The machine shop called Friday and said they could work my block work in at the end of next week.
I am having it aligned honed because The former machine shop lost the main caps. I thought I would have the 428 decked while it is there.
I was thinking 10.160.
What do you guys think  would be the correct height for a 428.
Thanks
Greg 

[plovett]

I don't know if there is one correct deck height, but my 428 is decked to 10.160".  In general, I think you take as little off the deck as possible, to get it straight and flat.   That is unless you are cutting the deck to "zero deck" it for a specific set of pistons.

paulie

[blykins]

Last aftermarket iron block I did took .015" to make both sides right. 

Just cut it until both decks are straight and parallel to the crank C/L.   I'd rather have the block correct and adjust your piston/head clearance with head gaskets than to have different cylinders at different compression ratios.

[gregaba]

Thanks for the reply's.
I think It would be better to have the same compression on each cylinder.
That is why I was asking, I didn't know if there was a certain amount to take off that would be a standard cut to make it right.
I realize that each block is different but wanted to get it as right as possible.
Greg

[My427stang]

Of my last 4, 2 squared up at 10.160, 2 at 10.155. Just tell your machinist to square to the mains . He will cut what is needed.

Like Brent said, very common

[gregaba]

Thanks
Will do. Its been about 25 years since I built my last 428 and I want to be sure I don't screw something because I forgot what I used to know.
I have been building 351C's,429,460's and a ton of SBC's and BBC's since then.
Greg

[Falcon67]

For running stock crank and rods, I will usually get a rough bore done, bring the block back home, clean it and assembly at least 4 corners but typically all 8.  Take readings then pick a cut number.  For an aftermarket kit, I'll get the shop to even up the decks with as little cut as possible, then supply the deck measure to the supplier of the rotating assembly.  With the current tech, they can spit out pistons to set the final deck clearance anywhere you like. 

[gregaba]

I am running a stock 10-10 crank, Scat H beam forged rods, and forged Speed pro pistons [Flat tops] aluminum heads
 Would like to keep compression about 11-1 because we can only get 91 octane gas within  70 miles of where I live.
The machine shop is 180 mile round trip and they are super busy so if I bring the block home after I have it align honed it might be another 2 or 3 months before I can get an appointment to get it finished.
Thanks for the help.
Greg

[My427stang]

I am running a stock 10-10 crank, Scat H beam forged rods, and forged Speed pro pistons [Flat tops] aluminum heads
 Would like to keep compression about 11-1 because we can only get 91 octane gas within  70 miles of where I live.
The machine shop is 180 mile round trip and they are super busy so if I bring the block home after I have it align honed it might be another 2 or 3 months before I can get an appointment to get it finished.
Thanks for the help.
Greg

Nowadays there is no reason to mock up unless it gives you peace of mind.  Add up 1/2 of stroke, rod length, and compression height and see what deck height it takes to get a good quench and desired compression with the pistons you have.    Then tell the machine shop to square deck to the mains at that height. 

Example:  (1/2 of 3.98) + 6.488 + 1.667 = 10.145, cut block to 10.150 and use a Felpro 1020 gasket for .046 quench, and check compression values

Use your own numbers for rod length from SCAT and Speedpro compression height and you have your numbers.

[gregaba]

Thanks
I will do that, nice to know the math.
Greg