Thick deck head with the most chamber cc's.......????
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Joined: Nov 2003
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From: Norn Iron
But when I measured them myself earlier in the year I would have said they were closed to 72cc. Wouldnt say my measuring practise was 100% accurate though.
So my 74cc may be wrong and it could well be 70cc.
Oddly I'm pretty sure they were sold to me as 74cc about 5 years ago. I needed them in a huge rush, so really I was happy to get anything at the time. They are absolutely not 64cc though
But when I measured them myself earlier in the year I would have said they were closed to 72cc. Wouldnt say my measuring practise was 100% accurate though.
So my 74cc may be wrong and it could well be 70cc.
But when I measured them myself earlier in the year I would have said they were closed to 72cc. Wouldnt say my measuring practise was 100% accurate though.
So my 74cc may be wrong and it could well be 70cc.
TECH Apprentice
Joined: Sep 2005
Posts: 334
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Try calling Richard at West Coast Cylinder Heads (LS1Tech sponsor). He machines the Edelbrock castings; you can get them with 74cc chambers using HIP'd castings which makes them very durable for forced induction applications.
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ProComp are 80cc IIRC. Not that I'd use them for FI...
For FI, you can get Cometic's w/ thicker compressed thickness, they won't cause detonation issues like they would in a NA setup.
For FI, you can get Cometic's w/ thicker compressed thickness, they won't cause detonation issues like they would in a NA setup.
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Just curious why you are looking for something larger than 72cc?
I built my engine with low compression pistons, 72cc AFR's, and Cometic gaskets, and I managed to only get 9.06:1 static compression out of it. But in hindsight I really wish I wouldnt have done that, because now I am going single front mount and E85, and that 9:1 compression is not good for either one of those. Wish it was more in the 10.0 - 10.5 range.
I built my engine with low compression pistons, 72cc AFR's, and Cometic gaskets, and I managed to only get 9.06:1 static compression out of it. But in hindsight I really wish I wouldnt have done that, because now I am going single front mount and E85, and that 9:1 compression is not good for either one of those. Wish it was more in the 10.0 - 10.5 range.
9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
Just curious why you are looking for something larger than 72cc?
I built my engine with low compression pistons, 72cc AFR's, and Cometic gaskets, and I managed to only get 9.06:1 static compression out of it. But in hindsight I really wish I wouldnt have done that, because now I am going single front mount and E85, and that 9:1 compression is not good for either one of those. Wish it was more in the 10.0 - 10.5 range.
I built my engine with low compression pistons, 72cc AFR's, and Cometic gaskets, and I managed to only get 9.06:1 static compression out of it. But in hindsight I really wish I wouldnt have done that, because now I am going single front mount and E85, and that 9:1 compression is not good for either one of those. Wish it was more in the 10.0 - 10.5 range.
Well, my AES 390ci is on its way to me right now. I had them buuild it with 10.8:1 cr......with flat top pistons, so I won't have such an N/A dog for the next 8-9 months.
Then when I install the turbo in 8-9 months I'll be using full time E85 fuel for sure but still wanted to lower the compression a little bit when I get new heads. My heads now are 69cc so I need some larger chambered new heads to drop the compression. Using LS9 head gaskets.
I don't want to do a piston change later on...........
I plan to go 18psi......single turbo....E85. 100% street car. Will never see a drag strip.
.
Then when I install the turbo in 8-9 months I'll be using full time E85 fuel for sure but still wanted to lower the compression a little bit when I get new heads. My heads now are 69cc so I need some larger chambered new heads to drop the compression. Using LS9 head gaskets.
I don't want to do a piston change later on...........
I plan to go 18psi......single turbo....E85. 100% street car. Will never see a drag strip.
.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
So are those pistons in it now suitable for boost ? Or are they a n/a piston ?
The two are not the same.
And having driven my own n/a when I first put it together a few weeks ago. At around 9.0:1 it could hardly be described as a dog. It drove superbly and went far better than I expected.
The two are not the same.
And having driven my own n/a when I first put it together a few weeks ago. At around 9.0:1 it could hardly be described as a dog. It drove superbly and went far better than I expected.
So are those pistons in it now suitable for boost ? Or are they a n/a piston ?
The two are not the same.
And having driven my own n/a when I first put it together a few weeks ago. At around 9.0:1 it could hardly be described as a dog. It drove superbly and went far better than I expected.
The two are not the same.
And having driven my own n/a when I first put it together a few weeks ago. At around 9.0:1 it could hardly be described as a dog. It drove superbly and went far better than I expected.
I should be 10.8 right now......going from 69cc up to 72cc will give me 10.3:1 cr. if we figured right.....
69cc heads
.051 gaskets
Flat pustons
3.825 stroke
4.030 bore
.
