Hope so, it would be a good thing if that's all it is. Good luck!!Well, it isn't pinging anymore, so, no, I am not going to pull a head off. As far as how far down in the hole, the machinist said the deck had not been cut as far as he could tell and that he only surfaced the deck. "Probably less than ten thousandths" to quote him. And from what I've learned the deck heights could vary from the factory, no?
It's running great now and not pinging at all.
I DO think it should be fine.
I think it was an ignition issue mostly.
High compression blues.
- Thread starter hosehead
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hosehead
Well-Known Member
Me too, my friend! And thanks for all the input! i appreciate it.
j par
Well-hung Member
Okay if I got his question right it was are Pistons at a positive even or negative deck Height? Mine are positive (out of the hole) .010, above deck if you will.
Again I don't think it was a quench deal, I think it was all in the ignition module like you were saying.
I know nothing about Big Blocks!
Again I don't think it was a quench deal, I think it was all in the ignition module like you were saying.
I know nothing about Big Blocks!
hosehead
Well-Known Member
Definitely DOWN in the hole. We talked about true zero deck and agreed not to do that.(thankfully). A rare moment of foresight.
LOL!! I'm referring to post#98, and Everybody is saying "He should be fine" with those heads & 11:1's, which he should be. Big-Block Mopars have about the worst OE spark
plug position possible, that is a factor, the TF versions are improved tho'. With that & the deck square/trim He may be fine.
j par
Well-hung Member
Well there you have it. That's what I was getting at with wasn't even close to really pinging because of compression and or fuel in the first place?Definitely DOWN in the hole. We talked about true zero deck and agreed not to do that.(thankfully). A rare moment of foresight.
j par
Well-hung Member
Honestly I don't know what I'm talking about with Big Blocks and how much they very from small blocks as far as their tolerances for pinging ignition and all that stuff. So my comments are mostly coming from the south end!
hosehead
Well-Known Member
The error in the math would be the catalogs have 1.991" compression distance listed for '68&^ @ 10.1:1, it is not, that is for closed chamber 440's. The open chambers
are 2.035" compression distance. But that cranking compression is still up there!!!!??
are 2.035" compression distance. But that cranking compression is still up there!!!!??
j par
Well-hung Member
I think I was thinking ahead (I hope) with the overlap thing that you're were thinking about doing. As I recall this cam is so choppy, extreme overlap, or low lobe separation. My fingers will be crossed when I throw 91 in it.
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