427 Project Questions
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 59
Likes: 0
427 Project Questions Hi Guys,
I am embarking on a 427 project and have some questions (even after
reading a hell of a lot on this site).
We'll be buying parts from the USA and shipping to Australia, so we need
to be relatively careful (shipping is a major cost).
-L92 Heads-
If we use L92 heads do we HAVE to use the L76 intake?
Can other LS1/LS2 intakes be modified to work with these heads?
-LS7 vs LS2 (resleeved) block-
Is there consensus opinion on the better option? What is the current
price for an LS7 block? I see it on GMPP for about $US2300.
Does anyone know of vendors that currently have the LS7 block for a similar price?
-Cubes-
Can the GM LS7 block be used for A 440ci stoker? or are we limited to
427?
thanks for any pointers, much appreciated!
I am embarking on a 427 project and have some questions (even after
reading a hell of a lot on this site).
We'll be buying parts from the USA and shipping to Australia, so we need
to be relatively careful (shipping is a major cost).
-L92 Heads-
If we use L92 heads do we HAVE to use the L76 intake?
Can other LS1/LS2 intakes be modified to work with these heads?
-LS7 vs LS2 (resleeved) block-
Is there consensus opinion on the better option? What is the current
price for an LS7 block? I see it on GMPP for about $US2300.
Does anyone know of vendors that currently have the LS7 block for a similar price?
-Cubes-
Can the GM LS7 block be used for A 440ci stoker? or are we limited to
427?
thanks for any pointers, much appreciated!
On The Tree
Joined: Dec 2003
Posts: 179
Likes: 0
From: Bloomington, MN
As for the intake the L-76 or a sheet metal is about your only option. The LS-7 block is a good value for the money and you could build a 440 with that block but I would advise against it [a taller deck is really needed with more than 4 inches of stroke] call TPIS we will get you the right parts.
If we use L92 heads do we HAVE to use the L76 intake? Yes
Can other LS1/LS2 intakes be modified to work with these heads? No. No reason to, the L76 flows more than any of the cathedral port stuff anyway.
-LS7 vs LS2 (resleeved) block-
Is there consensus opinion on the better option? Depends on useage. If you are staying NA, stick with the LS7 block. If you are going FI or big nitrous, go with the relsleeved LS2. Simply because of the better quality liners in the LS2 block.
Can the GM LS7 block be used for A 440ci stoker? Yes it can, however if you plan on doing this, be very careful because of sleeve length. If you are plannning on this I would go with the resleeved LS2 because of the longer sleeves.
Good luck!!
Can other LS1/LS2 intakes be modified to work with these heads? No. No reason to, the L76 flows more than any of the cathedral port stuff anyway.
-LS7 vs LS2 (resleeved) block-
Is there consensus opinion on the better option? Depends on useage. If you are staying NA, stick with the LS7 block. If you are going FI or big nitrous, go with the relsleeved LS2. Simply because of the better quality liners in the LS2 block.
Can the GM LS7 block be used for A 440ci stoker? Yes it can, however if you plan on doing this, be very careful because of sleeve length. If you are plannning on this I would go with the resleeved LS2 because of the longer sleeves.
Good luck!!
Talk to Katech-------->sponsor. They would probably be the best ones to call for advice on "circuit" questions.
An alloy lsx is planned, but it is a ways off. Warhawk has a block available now that would fit your needs, and provide plenty of flexibility for future upgrades. Katech has one of these available. A little pricey $4500+, but very worthwhile.
An alloy lsx is planned, but it is a ways off. Warhawk has a block available now that would fit your needs, and provide plenty of flexibility for future upgrades. Katech has one of these available. A little pricey $4500+, but very worthwhile.
for the money, get a complete L92 stroker setup....416 cubes all forged, nasty cam, L92 heads ported/polished/assembled/best springs, retainers, valves, etc., L76 intake setup....
About $7500 for all of the above. I would imagine your looking at 650-675 crank hp with a big enough cam.
A 427 is a nice motor, but a lot more expensive.
SDB
About $7500 for all of the above. I would imagine your looking at 650-675 crank hp with a big enough cam.
A 427 is a nice motor, but a lot more expensive.
SDB
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Verdad Gallardo Yes, but if money is a consideration, the 416 L92 will make big power for several thousands less!. Of course, the LS7 heads are badass. If you really want something nasty, then get the warhawk block, go 454-511 cubes, get the ETP canted valve heads and a .900 lift cam. Unless your a *****!!!!!!!!!!!!!
God, that would be a nasty *** motor....maybe 850-900 crank hp with 13-1.
God, that would be a nasty *** motor....maybe 850-900 crank hp with 13-1.
I dont know why some people think that L92 heads are not a good fit with the LS7 block. The STOCK flow numbers and 260cc port is more than enough for the LS7 block. L92 Ported versions will probally be just as good as LS7 heads if not better for alot less.
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 59
Likes: 0
Just wanted to say thanks for all the info.
The L92 block sounds like a bargain, but in the end there were too many potential questionmarks related to that option (for my application).
We ended up ordering the GM LS7 Block; I wanted L92 heads but SDPC didnt have any assembled in stock (with 650 lift) so we took some bare L92 heads anyway. My mechanics do a bit of headwork themselves; it will be interesting to see what they come up with.
We still have an option on the rotating assembly, we can source Eagle components locally (in Australia) quite readily, but there just doesnt seem to be much available otherwise.
If anyone knows were I can get a rotating assembly in the USA (or Australia for the that matter) to make a 427~440ci motor to match the GM LS7 block, please let me know! The LUNATI stuff looks pretty good, but you just dont find 438ci (or 427) Lunati kits sitting on the shelves down here.
I noticed in the USA the Lunati kits are about 50% more $$ (vs say Eagle) but for some reason in Australia they list for 100% more. I would be interested in hearing from customers or vendors with respect to who may have avaiability of rotating assemblies (or major components thereof) that can ship down under.
Thanks for all your help!
The L92 block sounds like a bargain, but in the end there were too many potential questionmarks related to that option (for my application).
We ended up ordering the GM LS7 Block; I wanted L92 heads but SDPC didnt have any assembled in stock (with 650 lift) so we took some bare L92 heads anyway. My mechanics do a bit of headwork themselves; it will be interesting to see what they come up with.
We still have an option on the rotating assembly, we can source Eagle components locally (in Australia) quite readily, but there just doesnt seem to be much available otherwise.
If anyone knows were I can get a rotating assembly in the USA (or Australia for the that matter) to make a 427~440ci motor to match the GM LS7 block, please let me know! The LUNATI stuff looks pretty good, but you just dont find 438ci (or 427) Lunati kits sitting on the shelves down here.
I noticed in the USA the Lunati kits are about 50% more $$ (vs say Eagle) but for some reason in Australia they list for 100% more. I would be interested in hearing from customers or vendors with respect to who may have avaiability of rotating assemblies (or major components thereof) that can ship down under.
Thanks for all your help!
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 59
Likes: 0
Well we went with the LS7 block, L92 heads (which my speedshop is porting) with the SDPC L76 intake package (excellent value that). The motor will be 438ci and going into a 2004 Holden Monaro. I would like an 8TB, but I will have to wait for that
Some pics of the build here!
http://www.trackchat.com.au/forum/showthread.php?t=813
Some pics of the build here!
http://www.trackchat.com.au/forum/showthread.php?t=813
I have it for sale 
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 59
Likes: 0
Well guys my mechanics got the motor finished last Thursday night, and by Friday afternoon we were at the strip (at the aussie LS1 nationals).
I managed a 11.5 second pass at 125mph
Video here:
http://www.photothingo.com/users/100...070414_001.wmv (6mb)
The car is primarily set up for road course (circuit) work but i am confident we can see a 10 second 1/4 mile pass with that mph regardless. Perhaps we need some drag specific suspension and some driving tuition! And auto and high stall might help too, but i will have to make do with a T56..
The motor is an LS7 block, L92 heads (ported by my speed shop) and 438ci rotating assembly. The block, heads, valvetrain and other parts were researched on ls1tech! so many thanks to everyone that helped out, much appreciated.
I managed a 11.5 second pass at 125mph
Video here:
http://www.photothingo.com/users/100...070414_001.wmv (6mb)
The car is primarily set up for road course (circuit) work but i am confident we can see a 10 second 1/4 mile pass with that mph regardless. Perhaps we need some drag specific suspension and some driving tuition! And auto and high stall might help too, but i will have to make do with a T56..
The motor is an LS7 block, L92 heads (ported by my speed shop) and 438ci rotating assembly. The block, heads, valvetrain and other parts were researched on ls1tech! so many thanks to everyone that helped out, much appreciated.
Originally Posted by forrestd
Well guys my mechanics got the motor finished last Thursday night, and by Friday afternoon we were at the strip (at the aussie LS1 nationals).
I managed a 11.5 second pass at 125mph
Video here:
http://www.photothingo.com/users/100...070414_001.wmv (6mb)
The car is primarily set up for road course (circuit) work but i am confident we can see a 10 second 1/4 mile pass with that mph regardless. Perhaps we need some drag specific suspension and some driving tuition! And auto and high stall might help too, but i will have to make do with a T56..
The motor is an LS7 block, L92 heads (ported by my speed shop) and 438ci rotating assembly. The block, heads, valvetrain and other parts were researched on ls1tech! so many thanks to everyone that helped out, much appreciated.
I managed a 11.5 second pass at 125mph
Video here:
http://www.photothingo.com/users/100...070414_001.wmv (6mb)
The car is primarily set up for road course (circuit) work but i am confident we can see a 10 second 1/4 mile pass with that mph regardless. Perhaps we need some drag specific suspension and some driving tuition! And auto and high stall might help too, but i will have to make do with a T56..
The motor is an LS7 block, L92 heads (ported by my speed shop) and 438ci rotating assembly. The block, heads, valvetrain and other parts were researched on ls1tech! so many thanks to everyone that helped out, much appreciated.
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 59
Likes: 0
Car weighs 3993lb's including driver (1730kg + 85kg) so it is relatively heavy. It is a full weight street car (nothing stripped) but we were running M/T ET streets and 3.9 gears. We didnt have a lot of time for the tune, i think it has a little more in it. Cam is in the 240~250 region, we might be trying another profile soon. We have a target of higher MPH, but very happy for first run out.
