427 LT1 or LS7
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Staging Lane
Joined: May 2010
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427 LT1 or LS7 I was looking at some of Katech's engines and got to wondering what engine would have more potential (equal cubes) as a NA pump gas motor for the street and track use? LT1 would have to have new sleeves put in obviously.
LS7 has the benefit of larger valves thanks to the larger factory bore and a much bigger aftermarket.
I don't really know a whole lot about gen V stuff but I'm assuming even in highly modified form the DI and VVT can give much better street manners when paired with a big cam
LS7 has the benefit of larger valves thanks to the larger factory bore and a much bigger aftermarket.
I don't really know a whole lot about gen V stuff but I'm assuming even in highly modified form the DI and VVT can give much better street manners when paired with a big cam
I think it would depend on how you got to 427 on the LT1. If you used the same bore to stroke ratio as the LS7 the LT1 would probably have an advantage. DI is generally worth more TQ, better fuel economy and better emissions.
Overall HP given a similar camshaft would probably net roughly the same HP. It all comes down to cost and packaging. The LS7 would be easier to swap into most if not all vehicles that are not native genV LT1.
Overall HP given a similar camshaft would probably net roughly the same HP. It all comes down to cost and packaging. The LS7 would be easier to swap into most if not all vehicles that are not native genV LT1.
TECH Fanatic
Joined: Aug 2009
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From: Coast of San Mateo County Between Pacifica & HMB
Aftermarket cylinder heads flow more air, and more efficiently than
the factory LT1 heads thereby offsetting the DI Advantages for the
track. for example a set of TFS LS7 heads ported by Tony Mamo
flow 410+ CFM @ .600" through a port smaller than 265 CCs
combined with a medium sized cam and Mammofied MSD
Intake it would annihilate the LT1 set up at the track and drive the
same or better on the street with similar cam specs and compression.
the factory LT1 heads thereby offsetting the DI Advantages for the
track. for example a set of TFS LS7 heads ported by Tony Mamo
flow 410+ CFM @ .600" through a port smaller than 265 CCs
combined with a medium sized cam and Mammofied MSD
Intake it would annihilate the LT1 set up at the track and drive the
same or better on the street with similar cam specs and compression.
LS1Tech Sponsor
Joined: Sep 2004
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A built LS7....especially with my new heads Navy Blue mentioned and my ported MSD intake....honestly its not even a contest.
A well designed LS7 set-up will destroy a similar cammed similar compression LT1 engine....I'm talking a blow out in comparison. The LS7 cylinder heads are superior (flow more) than a ported LT1 head even in stock trim....and especially aftermarket with the right modifications.
Im not a fan of what GM did to these first Gen LT1 heads.....even ported they are so so at best (like I already mentioned, they still don't flow what an LS7 flows out of the box).
My guess is GM will come out with a radically improved design in the future (using the existing LT1 architecture....just much needed port design improvements). Honestly they will have to in an effort to stay competitive in this insane OEM fight for supremacy of late
Forget the late 60's....this is the time to be into modding cars and OEM horsepower wars.....this coming from a guy that only just missed that former era!....LOL
Awesome stuff!!
Cheers,
Tony
A well designed LS7 set-up will destroy a similar cammed similar compression LT1 engine....I'm talking a blow out in comparison. The LS7 cylinder heads are superior (flow more) than a ported LT1 head even in stock trim....and especially aftermarket with the right modifications.
Im not a fan of what GM did to these first Gen LT1 heads.....even ported they are so so at best (like I already mentioned, they still don't flow what an LS7 flows out of the box).
My guess is GM will come out with a radically improved design in the future (using the existing LT1 architecture....just much needed port design improvements). Honestly they will have to in an effort to stay competitive in this insane OEM fight for supremacy of late
Forget the late 60's....this is the time to be into modding cars and OEM horsepower wars.....this coming from a guy that only just missed that former era!....LOL
Awesome stuff!!
Cheers,
Tony
__________________
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
VVT Cam Use Your question about VVT :
The VVT camshaft USE is MORE effective with LOW duration lobes.
The VVT camshaft USE could/most always requires "travel" limiters to PREVENT P/V contact.
I provide such items including a "stand alone" VVT controller with Laptop GUI software at a low cost.
Lance
The VVT camshaft USE is MORE effective with LOW duration lobes.
The VVT camshaft USE could/most always requires "travel" limiters to PREVENT P/V contact.
I provide such items including a "stand alone" VVT controller with Laptop GUI software at a low cost.
Lance
TECH Senior Member
Joined: Jul 2009
Posts: 8,032
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Anyone have any inside news if MAST will ever jump on the LT1 based performance bandwagon?
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VVT Cam Use OK Jimbo, MY guess is based on the "lack" of definition in your question.
SURE, I use Crower Cams as my grinder, I have my own lobes there.
THUS, my cams are aftermarket/beforemarket.
MY work is often requested by OEM's during engine development.
Yes I have done this "without" using small lobes to prevent P/V contact.
I have also done "camless" OHV development on my bench dyno. (free run engine)
Lance
SURE, I use Crower Cams as my grinder, I have my own lobes there.
THUS, my cams are aftermarket/beforemarket.
MY work is often requested by OEM's during engine development.
Yes I have done this "without" using small lobes to prevent P/V contact.
I have also done "camless" OHV development on my bench dyno. (free run engine)
Lance
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On The Tree
Joined: Feb 2007
Posts: 158
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I was about to ask the dumb question if Tony was still with AFR, then I happen to notice the Mami performance in his signature, when did this happen. Also second question is the new Edelbrock Vic castings for the Lt1 where at Sema, but nothing has been even whispered since. Any ideas when they should be making another appearance.