Ok. I've asked the questions about quench and found that with my deck clearance of .070 I wont be able to achieve it. I want to get into the area of 9.5 or 10:1 cr. With that kind if deck clearance I don't see how I can get there with 351c-2v. If I were to use the aussies with that kind of clearance would I have any other problems besides not achieving quench? I have the Badger flat tops, and it's in the truck so I'm not taking it out to get the block decked. I have 82.3cc chambers now cause I screwed up when doing my stock heads.(There I admitted it and I feel better)

 

i do not see a ?

anyhoo, you aint gonna get quench with a slug .070" in the hole.
put a smaller chambered head, and mill the block .040", and you end up with a piston .032" down, and a HG thickness of ~ .040, this give ya .072" of qunch, right in detonationville!

i been trying to figure out how to do this without 650 dollar pistons, but cannot get it done. many will say its ok, it wont ping etc, but sorry, with the piston that far down the hole, your going to get the cylinder edges real hot iffin you run decent amounts of timing, and/or load the truck hard.

another idea i talked to a machinist about, milling the main caps .040"....this would bring the crank up when the mains get align bored by .020", and then cut .045" off the deck. this SHOULD give roughly .007" below deck piston height, and with a .040" gasket, this is .047" of quench, and just barely in detonation zone....problems are a timing chain length, and main seals...so forget that idea.

basically, i figgered, with all the machine work costs, special pistons etc, to get a zero deck height 400, and build it for some performance, a 460 is way cheaper, and easier to build, not to mention a ton easier to find parts for.

my .002

 

you can reach 9.5~10 by running a cut down dome(solid dome i should say) or flat top and mill the deck and or head
now a question >>
do you live near a racetrack or airport cause your gonna neeed av or race fuel
you can drop a few grand into alloy heads
or a several grand in a custom build

 

I can't find the actual formula for how much milling you heads, so this is from memory so take it with that in mind but I pretty sure I am close, but if you mill your heads .030 it should put your chambers at about 78 (I think it is about 1.5 per .010 of change on open chamber heads), and then Iran that through and came up with 9.14 compression, and you can run pump gas, and still be ok. the aussie heads will put you at 10.9 or so, and that is in the range of needing 100LL, or atleast premium, and octane booster, and if you zero decked it with those heads it would put you into the 13.30 range, even with quench you will need sonoco race fuel. OH those compression figures are for a 400 hope that is what ou have as I did see you mentioning it but the next post did say something about a 400, and 351 is lower.

 

I was able to get custom J.E. pistons for my bullet for about $450. They are forged and dished. The outside of the piston head is flat and while it wont get you quench effect it does tend to elimate the preignition caused by the piston being down in the hole. Not certain of my compression but probably about 10:1 ( 165psi static). To me it was a no brainer to spend the money and eliminate the problem.

 

So if I were to put Aussies on with my deck clearance of .070 the edges of the cylinder walls get so hot that they will cause detonation. Is that right? Whats a mother to do? I thought I got enough info before this first build but I guess not.

 

To the best of my knowledge the "squish" area does not cool the charge to prevent detonation, It produces a turbulence effect that breaks up the flame front. It is called "quench" but that may be a misnomer.

I am just happy to hold my compression down to about 9:1 and eliminate the worries and expense of custom pistons. The increase in power to me is not worth the added headache. There are other ways to increase power.

 

i like the idea of going all out (3/4 of the way) with a 400 because everyone hasn't
if i wanted to be like every1 else i would drive a sb cheesey or a 5.0
first find a good machineist THAT has either 400 exeriance or 351c and won't try and won't try and build you a wheezer even go so far as look at what they drive sure sometimes they have no spare time and drive a early 80s riceball

 

I have traded a few emails with Tim Meyer. He is working on a set of flattops for the 400 with 'zero' deck clearance. He says they can be machined with a dish to produce any CR desired. He says he will advertise them on FTE when they are ready. I don't know what the price will be.

 

hopefully they will be at least hypertic(mis-spelled of course) so i can run closer tolerences
but even cast easy fit pistons would be good at a good price

see if da man(if he does it, the name shall be chiseled into FoMoCo HQ near henry's just above Jr's) will give a special pre-order group purchace to help finilize the process of getting them made