My new heads :-)
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From: Norn Iron
My new heads :-) I ordered them Monday evening UK time, and they arrived Friday afternoon, from Andy at A&A
Fed-Ex are great lol, albeit a little pricey.
Edelbrock 215's that have been ported a little. I think I'll leave the chambers as is at 66cc following other peoples advice of this forum.. Should put me at around 8.7:1 CR.
Valve Lift Intake ---Exhaust
.100"---- 67.6------55.8
.200" ----138.0-----121.3
.300"---- 207.2-----170.8
.400" ----256.6-----207.2
.500" ----291.1-----226.9
.550" ----302.3-----230.0
.575" ----305.1-----231.1
.600" ----307.5-----232.5
.625" ----310.7-----233.7
.650" ----310.7-----236.0
Intake runner volume = 212cc
Exhaust runner volume = 82cc
Combustion chamber volume = 66cc
Test bore = 4.030"
Intake port tested with radius flow plate
Exhaust tested with stub pipe
Be going on my new 382, with YSi blower. Hopefully it will make a bit of power.
Fed-Ex are great lol, albeit a little pricey.
Edelbrock 215's that have been ported a little. I think I'll leave the chambers as is at 66cc following other peoples advice of this forum.. Should put me at around 8.7:1 CR.
Valve Lift Intake ---Exhaust
.100"---- 67.6------55.8
.200" ----138.0-----121.3
.300"---- 207.2-----170.8
.400" ----256.6-----207.2
.500" ----291.1-----226.9
.550" ----302.3-----230.0
.575" ----305.1-----231.1
.600" ----307.5-----232.5
.625" ----310.7-----233.7
.650" ----310.7-----236.0
Intake runner volume = 212cc
Exhaust runner volume = 82cc
Combustion chamber volume = 66cc
Test bore = 4.030"
Intake port tested with radius flow plate
Exhaust tested with stub pipe
Be going on my new 382, with YSi blower. Hopefully it will make a bit of power.
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From: Norn Iron
Originally Posted by DeltaT
Very nice - I envy you those numbers from a 212cc intake!
What are your valve sizes?
Jim
What are your valve sizes?
Jim
Originally Posted by peter pan
Sweet heads, I put West Coasts 72 CC heads on A&A blowin car and just love the setup 
Any details of how it performs ? power ? what spec is yours ?
edited...just found info over on the corvetteforum
Last edited by stevieturbo; Jan 22, 2006 at 04:08 PM. Reason: just found info
They would pose a limit because the decks on the head would be too thin and when there is a large amount of pressure (boost) it makes the heads lift... That's his question of if you know how much boost they can hold before this happens...
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From: Norn Iron
You could have detonation an engine running 10psi that would have higher cylinder pressures that could casue leakage of some sort, either by blowing the gasket, or "heads lifting" as you guys call it, than a well setup engine running 15+psi with no detonation.
Detonation causes far higher pressures than virtually any amount of boost will.
I hear so many people talk about lifting the heads, but I just find it hard to believe its simply a boost or head deck thickness related issue.
I was running 16psi @ 6200rpm with my old 346, with ported 853 castings ( and probably milled a good bit too, down to about 62cc. CR achieved thru dished pistons ), and had no issues with gasket sealing.
The Edelbrock heads claim to have a 5/8" deck.
Detonation causes far higher pressures than virtually any amount of boost will.
I hear so many people talk about lifting the heads, but I just find it hard to believe its simply a boost or head deck thickness related issue.
I was running 16psi @ 6200rpm with my old 346, with ported 853 castings ( and probably milled a good bit too, down to about 62cc. CR achieved thru dished pistons ), and had no issues with gasket sealing.
The Edelbrock heads claim to have a 5/8" deck.
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Verdad Gallardo I'm not saying that these will or won't at a particular amount of boost...There are several factors that dictate if a head will lift...One being thickness of the deck...One that you stated which is detonation can have a factor...If you run head studs it can help against this...It's hard to say at what amount they would lift but just like blocks having a thresh hold in which they twist from too much power, heads have the same problem with lifting from too much boost...I was just trying to clarify his question for you so that you could properly answer it though...My question is how much you had to fork out and if they come with a 72cc combustion chamber...
Originally Posted by stevieturbo
Why would the heads pose limits on boost ?
I'll be running as much boost as I can make.
I'll be running as much boost as I can make.
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From: Norn Iron
Originally Posted by 98turbls1
My question is how much you had to fork out and if they come with a 72cc combustion chamber...
Although they were on offer for slightly less. Check West Coasts site, although I got mine via Andy.
My heads have a 66cc chamber.. Edelbrock supply them as 65cc, CNC machined.
Andy said the castings are also available with 74cc chambers, so finding 72cc shouldnt be difficult.
Edelbrocks site say 40-80cc are possible.
http://www.edelbrock.com/automotive_..._ls1_rpm.shtml
As for my valve size measurements. According to Edelbrock, the inlet is actually 2.02"
Measuring with a tape measure was never going to be that accurate lol
Cool man...Thanks...I'll check them out and see what they can help me out with...I'm going to be running a PTE88 turbo kit...I'm going to try to see what I can get out of this setup..
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From: Norn Iron
The thing with the turbo though. You really dont need heads with massive ports in order to make power.
I think Nick Yoskin twin turbo car over on corvetteforum is using the AFR205's on his car, and he's running low 9's and trapping close to 150.
I chose these heads, as they appear to flow very well, even with small ports. So this should help things in the lower rpm's where my blower wont be making a lot of boost.
Then up top, despite the small ports, the flow numbers are good, especially on the exhaust side, as Im tied with only 1 3/4" headers for fitment reasons.
I think Nick Yoskin twin turbo car over on corvetteforum is using the AFR205's on his car, and he's running low 9's and trapping close to 150.
I chose these heads, as they appear to flow very well, even with small ports. So this should help things in the lower rpm's where my blower wont be making a lot of boost.
Then up top, despite the small ports, the flow numbers are good, especially on the exhaust side, as Im tied with only 1 3/4" headers for fitment reasons.
