True? LS7s come with a version of C5R heads?
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
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From: Texas
Whoever posted the info about the 46MM intake valve was way off (by about 10MM) its around 56MM (2.20"). The port does look like a C5R, in fact I am wondering if we'll be able to use it with C5R heads. Anyhow, a 370 CFM port will make crazy power. You should see H/C cars in the 600RWHP range pretty easy...
TECH Senior Member
Joined: Jun 2003
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From: NYC metro area
This is craziness...
This will be the first time in history that a factory 500-hp will be so susceptible to aftermarket modification.
Who knows, some could be around 600 rwhp with heads/cam... and that's daily driven.
This will be the first time in history that a factory 500-hp will be so susceptible to aftermarket modification.
Who knows, some could be around 600 rwhp with heads/cam... and that's daily driven.
Well, that makes me happy too.
Ive got this 4.125 bore 387 sitting here with a really crap set of heads on it. I was wondering what to do.
Apparently I should just hang out until I can buy the stock LS7 top end.... if and when it's available.
chris
Ive got this 4.125 bore 387 sitting here with a really crap set of heads on it. I was wondering what to do.
Apparently I should just hang out until I can buy the stock LS7 top end.... if and when it's available.
chris
I also hope they make those 4" cranks/rods/pistons available at a reasonable price. If the rods really are titanium, I would hope that you could balance the crank with some normal forged rods.
chris
chris
I would imagine 600 to the tires at about 8500rpm. You would have to spin the **** out of that little motor for those heads to be worthwhile. It will be a contest as to who can go 8's NA with the least amount of cubes now.
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Verdad Gallardo 6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
You're going to need a big bore motor to use them...
Also, keep in mind the crank is a dry sump, so you will need to modify it to get it to work in a non dry sump block.
But, yes, the possibilities are amazing...
Also, keep in mind the crank is a dry sump, so you will need to modify it to get it to work in a non dry sump block.
But, yes, the possibilities are amazing...
I would imagine buying an LS7 outright will cost $$$$$$. For example, isn't an ls1/6 like 5 or 6k? And its cast etc? If you spent the money an LS7 will cost with a vendor....look out
Re: C5R headed 427's... are these high compression (read: non-pump gas) motors, or what?? Last I recall, the C5R heads came with stupid small combustion chambers that would either need to be pretty seriously opened up (to drop the compression) or run a piston with something silly like a 20cc dish.
Also, Louis- you mentioned that the intake ports on the LS7 heads are a C5R/SB2 derivative?? I wasn't aware that the C5R heads and the SB2 heads had anything in common other than both being GM pieces. Does that mean that the C5R (and therefore LS7) head is an 11° design as well??
Also, Louis- you mentioned that the intake ports on the LS7 heads are a C5R/SB2 derivative?? I wasn't aware that the C5R heads and the SB2 heads had anything in common other than both being GM pieces. Does that mean that the C5R (and therefore LS7) head is an 11° design as well??
The basic intake port design was taken from the SB2.2 heads when GM did the C5R.
The LS7 intake port is a derivative of those 2. Valve angle I am not aware of. From my understanding, the LS7 intake will bolt up to C5R heads. I would not doubt that the LS7 Heads will fit the LS1 block either. If the Race case at a 4.125 bore on a 4.4 center is good enough for LeMans, it is good enough for OEM. Same bore centers, no need to change the bolt spacing. The only thing they did was suck up the bolt holes and use short bolts for all 10 in the head itself. The 5 smaller ones up top will remain the same. Exactly like the LS2 and a few select LS6 blocks.
The angle at which the exhaust manifold bolts too is the same as well. Port diminsions are obviously different, but its the same as far as bolt on parts are concerned.
The LS7 intake port is a derivative of those 2. Valve angle I am not aware of. From my understanding, the LS7 intake will bolt up to C5R heads. I would not doubt that the LS7 Heads will fit the LS1 block either. If the Race case at a 4.125 bore on a 4.4 center is good enough for LeMans, it is good enough for OEM. Same bore centers, no need to change the bolt spacing. The only thing they did was suck up the bolt holes and use short bolts for all 10 in the head itself. The 5 smaller ones up top will remain the same. Exactly like the LS2 and a few select LS6 blocks.
The angle at which the exhaust manifold bolts too is the same as well. Port diminsions are obviously different, but its the same as far as bolt on parts are concerned.
Originally Posted by Louis
The basic intake port design was taken from the SB2.2 heads when GM did the C5R.
The LS7 intake port is a derivative of those 2. Valve angle I am not aware of. From my understanding, the LS7 intake will bolt up to C5R heads. I would not doubt that the LS7 Heads will fit the LS1 block either. If the Race case at a 4.125 bore on a 4.4 center is good enough for LeMans, it is good enough for OEM. Same bore centers, no need to change the bolt spacing. The only thing they did was suck up the bolt holes and use short bolts for all 10 in the head itself. The 5 smaller ones up top will remain the same. Exactly like the LS2 and a few select LS6 blocks.
The angle at which the exhaust manifold bolts too is the same as well. Port diminsions are obviously different, but its the same as far as bolt on parts are concerned.
The LS7 intake port is a derivative of those 2. Valve angle I am not aware of. From my understanding, the LS7 intake will bolt up to C5R heads. I would not doubt that the LS7 Heads will fit the LS1 block either. If the Race case at a 4.125 bore on a 4.4 center is good enough for LeMans, it is good enough for OEM. Same bore centers, no need to change the bolt spacing. The only thing they did was suck up the bolt holes and use short bolts for all 10 in the head itself. The 5 smaller ones up top will remain the same. Exactly like the LS2 and a few select LS6 blocks.
The angle at which the exhaust manifold bolts too is the same as well. Port diminsions are obviously different, but its the same as far as bolt on parts are concerned.