Looking for advice on my L92 heads
08-20-2008, 12:20 PM
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Looking for advice on my L92 heads http://cgi.ebay.com/ebaymotors/ws/eB...MEWN:IT&ih=013
Above is the link to the new L92 heads I just bought. I have an L76 intake manifold and a holley 90mm tb "cable driven". I bought a cam from EPP with 232/240 @ .050 and .595/.608 lift and a 115 LSA. I have been getting information from texas speed and plan on buying one of there 408 Iron blocks when I get home. These are pretty much the specs on the engine I plan on buying:
New gm LQ9 6.0 iron block
Callies compstar 4.00 Crank
Diamond -28cc dished pistons "25psi"
Total seal steel top ring set
Callies compstar 6.125 rods
ARP main stud kit
I also bought a custom crank girdle from DM performance. The guys at TS told me I'd be looking at about 8.65:1 on the compression. I am trying to find out what other parts would be a good match with the already ported L92 heads? What pushrods, lifters, rockers to use? I was even thinking about using a slightly larger rocker to maybe get a little more lift out of the cam since the heads max out at .660" I'm open for suggestions. Thanks
Oh and by the way, after the LT1 and 4L60E are swapped out with the LS and 4L80E, I plan on running twin 57mm turbos. Hints why I'm shooting for this type of build.
Above is the link to the new L92 heads I just bought. I have an L76 intake manifold and a holley 90mm tb "cable driven". I bought a cam from EPP with 232/240 @ .050 and .595/.608 lift and a 115 LSA. I have been getting information from texas speed and plan on buying one of there 408 Iron blocks when I get home. These are pretty much the specs on the engine I plan on buying:
New gm LQ9 6.0 iron block
Callies compstar 4.00 Crank
Diamond -28cc dished pistons "25psi"
Total seal steel top ring set
Callies compstar 6.125 rods
ARP main stud kit
I also bought a custom crank girdle from DM performance. The guys at TS told me I'd be looking at about 8.65:1 on the compression. I am trying to find out what other parts would be a good match with the already ported L92 heads? What pushrods, lifters, rockers to use? I was even thinking about using a slightly larger rocker to maybe get a little more lift out of the cam since the heads max out at .660" I'm open for suggestions. Thanks
Oh and by the way, after the LT1 and 4L60E are swapped out with the LS and 4L80E, I plan on running twin 57mm turbos. Hints why I'm shooting for this type of build.
08-20-2008, 01:30 PM
#2
http://cgi.ebay.com/ebaymotors/ws/eB...MEWN:IT&ih=013
Above is the link to the new L92 heads I just bought. I have an L76 intake manifold and a holley 90mm tb "cable driven". I bought a cam from EPP with 232/240 @ .050 and .595/.608 lift and a 115 LSA. I have been getting information from texas speed and plan on buying one of there 408 Iron blocks when I get home. These are pretty much the specs on the engine I plan on buying:
New gm LQ9 6.0 iron block
Callies compstar 4.00 Crank
Diamond -28cc dished pistons "25psi"
Total seal steel top ring set
Callies compstar 6.125 rods
ARP main stud kit
I also bought a custom crank girdle from DM performance. The guys at TS told me I'd be looking at about 8.65:1 on the compression. I am trying to find out what other parts would be a good match with the already ported L92 heads? What pushrods, lifters, rockers to use? I was even thinking about using a slightly larger rocker to maybe get a little more lift out of the cam since the heads max out at .660" I'm open for suggestions. Thanks
Oh and by the way, after the LT1 and 4L60E are swapped out with the LS and 4L80E, I plan on running twin 57mm turbos. Hints why I'm shooting for this type of build.
Above is the link to the new L92 heads I just bought. I have an L76 intake manifold and a holley 90mm tb "cable driven". I bought a cam from EPP with 232/240 @ .050 and .595/.608 lift and a 115 LSA. I have been getting information from texas speed and plan on buying one of there 408 Iron blocks when I get home. These are pretty much the specs on the engine I plan on buying:
New gm LQ9 6.0 iron block
Callies compstar 4.00 Crank
Diamond -28cc dished pistons "25psi"
Total seal steel top ring set
Callies compstar 6.125 rods
ARP main stud kit
I also bought a custom crank girdle from DM performance. The guys at TS told me I'd be looking at about 8.65:1 on the compression. I am trying to find out what other parts would be a good match with the already ported L92 heads? What pushrods, lifters, rockers to use? I was even thinking about using a slightly larger rocker to maybe get a little more lift out of the cam since the heads max out at .660" I'm open for suggestions. Thanks
Oh and by the way, after the LT1 and 4L60E are swapped out with the LS and 4L80E, I plan on running twin 57mm turbos. Hints why I'm shooting for this type of build.
08-20-2008, 07:52 PM
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You may need to rethink the -25cc pistons. The chambers are listed at 75cc on those heads, that is pretty large. I went with flat top pistons with a 75cc L92 head etc., worked out to around 9.5 to 1 or so. I guess it depends on your compression goals, but you might need to crunch the numbers before ordering that short block. As you know, those impy's are heavy, if you go too low on compression it will be a dog, even with the twins.
08-20-2008, 07:55 PM
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My rough estimate is around 8.4 or so like that, so that may work,but you and your engine builder need to determine what your compression goal will be.
08-20-2008, 09:57 PM
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i got my 408 iron block from 99blancoss and the engine is being built by Erik at HKE. the price was right, and they helped me spec out everything to work together. you definitely dont want to just piece a motor together or you will be unhappy. Talk to 99blancoss and see what they can do to help ya out.
08-21-2008, 05:08 AM
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I am located in the richmond, va area. "veee8" how much boost are you running and how much power are you making? I am trying to find a nice balance between compression and boost. Still a newbie with the LS engines but I am learning as I go. I've still got about 3 months before I get home so I still have a while to figure out my end goal. I will be running a 4L80E tranny with about a 2,800 stall. I want the car to be able to run on the streets even with low boost and not be a total slug. Any suggestion for the other parts on the heads?