SCR opinions please
SCR opinions please here is what I posted in the internal tech section
"Well I just got some sad news from the machine shop. My motor is finally together, and just for ***** and giggles, I had them cc's my factory, no machine work L92 heads, only change was to a LS3 intake valve, and they are telling me the heads are 64cc. Is this possible? I have read several times these heads are between 69.5-71cc and they are telling me they are 64cc uncut, untouched. I know this is only a bump from 10.2 to 10.6 on the SCR but I wasnt that thrilled about being at 10.1 for a turbo build. Im running piston/rod kit #k398x7 from wiseco.
http://www.wiseco.com/Catalogs/Automotive/Chevrolet.pdf"
Now I know most of the turbo gurus would be much lower on SCR to start with but this is to be a street motor, and I wanted something with some grunt out of boost. I had planned on trying to be able to run 10lbs on pump gas but now this. If these are in fact 64cc and you were in my shoes, would you pull the heads and go bigger, or just run it since its done and run a little less boost? not sure how I feel at this point, this is my first turbo build and I felt really good about it up to this point. Its not so much about the money, im just not sure if since I was already starting a little higher on SCR is this enough to worry about or should I just run it. The cam in it is a 229/240 on 114+4. Not sure where I end up on DCR, I was taking advice from the big guns for this build so I wouldnt make an error LOL
"Well I just got some sad news from the machine shop. My motor is finally together, and just for ***** and giggles, I had them cc's my factory, no machine work L92 heads, only change was to a LS3 intake valve, and they are telling me the heads are 64cc. Is this possible? I have read several times these heads are between 69.5-71cc and they are telling me they are 64cc uncut, untouched. I know this is only a bump from 10.2 to 10.6 on the SCR but I wasnt that thrilled about being at 10.1 for a turbo build. Im running piston/rod kit #k398x7 from wiseco.
http://www.wiseco.com/Catalogs/Automotive/Chevrolet.pdf"
Now I know most of the turbo gurus would be much lower on SCR to start with but this is to be a street motor, and I wanted something with some grunt out of boost. I had planned on trying to be able to run 10lbs on pump gas but now this. If these are in fact 64cc and you were in my shoes, would you pull the heads and go bigger, or just run it since its done and run a little less boost? not sure how I feel at this point, this is my first turbo build and I felt really good about it up to this point. Its not so much about the money, im just not sure if since I was already starting a little higher on SCR is this enough to worry about or should I just run it. The cam in it is a 229/240 on 114+4. Not sure where I end up on DCR, I was taking advice from the big guns for this build so I wouldnt make an error LOL
That's a big cam for L92's and only a T78.
Those heads flow a lot and only need like a 219/229 to shift at 6500 n/a.
Assuming your cr is accurate.... it looks like you've got a street n/a setup.
Your DCR is 8.3ish. Needs to be 7.5ish for 10psi.
Just get the head chambers worked.
Not sure why "they" spec'd a 3.2 cc dish for a 370 turbo motor.....
<edit> well, 8.3 dcr is about stock, so you could run 7psi or so. Or add meth and go to 10.
I did read some posts by some pro cam spec guys. And they thought a 219 intake lobe was a better idea on a street sq port setup.
Those heads flow a lot and only need like a 219/229 to shift at 6500 n/a.
Assuming your cr is accurate.... it looks like you've got a street n/a setup.
Your DCR is 8.3ish. Needs to be 7.5ish for 10psi.
Just get the head chambers worked.
Not sure why "they" spec'd a 3.2 cc dish for a 370 turbo motor.....
<edit> well, 8.3 dcr is about stock, so you could run 7psi or so. Or add meth and go to 10.
I did read some posts by some pro cam spec guys. And they thought a 219 intake lobe was a better idea on a street sq port setup.
Last edited by TurboS10; Jul 27, 2010 at 02:17 AM. Reason: more info
That's a big cam for L92's and only a T78.
Those heads flow a lot and only need like a 219/229 to shift at 6500 n/a.
Assuming your cr is accurate.... it looks like you've got a street n/a setup.
Your DCR is 8.3ish. Needs to be 7.5ish for 10psi.
Just get the head chambers worked.
Not sure why "they" spec'd a 3.2 cc dish for a 370 turbo motor.....
<edit> well, 8.3 dcr is about stock, so you could run 7psi or so. Or add meth and go to 10.
I did read some posts by some pro cam spec guys. And they thought a 219 intake lobe was a better idea on a street sq port setup.
Those heads flow a lot and only need like a 219/229 to shift at 6500 n/a.
Assuming your cr is accurate.... it looks like you've got a street n/a setup.
Your DCR is 8.3ish. Needs to be 7.5ish for 10psi.
Just get the head chambers worked.
Not sure why "they" spec'd a 3.2 cc dish for a 370 turbo motor.....
<edit> well, 8.3 dcr is about stock, so you could run 7psi or so. Or add meth and go to 10.
I did read some posts by some pro cam spec guys. And they thought a 219 intake lobe was a better idea on a street sq port setup.
Last edited by dimetweaker; Jul 27, 2010 at 02:03 PM.
i had same problem.
l92's supposed to be 69-70cc
mine cc'ed @ 64.5cc
ive got a 408 w/ 19cc dished pistons,
i was looking to go 9.1:1
this was my resolve:
cometic 4.080 bore gaskets (since l92 chambers came in at 4.076 edge to edge)
and bumped the thickness of gaskets up to .061" instead of stock .051"
l92's supposed to be 69-70cc
mine cc'ed @ 64.5cc
ive got a 408 w/ 19cc dished pistons,
i was looking to go 9.1:1
this was my resolve:
cometic 4.080 bore gaskets (since l92 chambers came in at 4.076 edge to edge)
and bumped the thickness of gaskets up to .061" instead of stock .051"
I have been thinking it over; the motor is already built to drop in, I think im just going to run it as is. Instead of changing gaskets, maybe doing some chamber work, etc. Im going to get in touch with WCCH and send them my other set of L92s once the truck is running, have a full cnc done and chamber work if possible and then slap them on the motor after I figure out how to get the first 700hp to hook in my tiny little truck 
then I can turn up the wick. Thanks for your input guys.
then I can turn up the wick. Thanks for your input guys. i had same problem.
l92's supposed to be 69-70cc
mine cc'ed @ 64.5cc
ive got a 408 w/ 19cc dished pistons,
i was looking to go 9.1:1
this was my resolve:
cometic 4.080 bore gaskets (since l92 chambers came in at 4.076 edge to edge)
and bumped the thickness of gaskets up to .061" instead of stock .051"
l92's supposed to be 69-70cc
mine cc'ed @ 64.5cc
ive got a 408 w/ 19cc dished pistons,
i was looking to go 9.1:1
this was my resolve:
cometic 4.080 bore gaskets (since l92 chambers came in at 4.076 edge to edge)
and bumped the thickness of gaskets up to .061" instead of stock .051"
.061 gasket. even in a boosted engine.
but if it was needed to lower the scr, thats fine also
Trending Topics
Lots of posts on TTF about squench being a non issue even with the old chambers. Just too much air in there getting squished.
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