LS4 swapping into a Montana
#1
LS4 swapping into a Montana
Hello everyone. The title pretty much says it all. Putting it in my retired family truckster 2000 Montana, complete takeout with bilsteins, 13" brakes, and all. Im not needing any swap info, got all that from the Fiero forums. Mostly just wanting to get more engine info. I plan on retaining the DoD. I am building the transmission like I do all my performance builds and of course it'll have my Limited Slip Differential.
But back to the cam. I need to know the stock cam specs so I can compare to the L76 G8GT cam. I am doing this on a budget, so used factory parts will be run as much as possible. If the L76 cam is 10deg longer at .050, it should be worth 30-40hp peak and mayb an extra 500_700rpm.
I can't go crazy bc the van weighs 4400#. I will be running 3.69 gears and single chain. I will be towing with this some. I think the key to better mileage with DoD will be the extra gearing. The V4 is way more efficient at 3000-3500rpm than it is lugging along at 2200rpm.
And of course, itll make a pass or two down the 1/4-mile track. Cuz thats what I do!
So, who knows the stock cam specs?
But back to the cam. I need to know the stock cam specs so I can compare to the L76 G8GT cam. I am doing this on a budget, so used factory parts will be run as much as possible. If the L76 cam is 10deg longer at .050, it should be worth 30-40hp peak and mayb an extra 500_700rpm.
I can't go crazy bc the van weighs 4400#. I will be running 3.69 gears and single chain. I will be towing with this some. I think the key to better mileage with DoD will be the extra gearing. The V4 is way more efficient at 3000-3500rpm than it is lugging along at 2200rpm.
And of course, itll make a pass or two down the 1/4-mile track. Cuz thats what I do!
So, who knows the stock cam specs?
#2
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sorry for the thread jack. Your username sounds familiar..Didnt you run a shop in marietta? The turbo bonneville with the 4t80-e?
https://ls1tech.com/forums/ls4-perfo...cam-specs.html
https://ls1tech.com/forums/ls4-perfo...cam-specs.html
#3
sorry for the thread jack. Your username sounds familiar..Didnt you run a shop in marietta? The turbo bonneville with the 4t80-e?
https://ls1tech.com/forums/ls4-perfo...cam-specs.html
https://ls1tech.com/forums/ls4-perfo...cam-specs.html
Thanks for the link, but there are some erroneous numbers there for duration. But if the 193/193 is correct, the G8 GT cam will be a good addition with 1.9 rockers. Its 200/208 and .278"/.282" at the lobe. With 1.9 rockers, that would be .530"/.536". Thats only a couple degrees shy of the LS3 cam (204/211). Car Craft put an LS3 cam in a 5.3 truck engine and it picked up 90hp at 6500!!! It only lost 18ft.lbs. at 3500. Im thinking a properly installed L76 cam would lose nothing at the bottom and gain maybe 80hp at the top. Looking at valve events, if the L76 cam was retarded 4deg, it would mimic tge LS3 cam events for intake opening and exh closing and could possibly make very nearly the same power.
Next question, what does a typical stock LS4 dyno at the wheels?
#4
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But back to the cam. I need to know the stock cam specs so I can compare to the L76 G8GT cam. I am doing this on a budget, so used factory parts will be run as much as possible. If the L76 cam is 10deg longer at .050, it should be worth 30-40hp peak and mayb an extra 500_700rpm.
#6
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Yes, thats me. There's only one Pontiacjeff! Ha!
Thanks for the link, but there are some erroneous numbers there for duration. But if the 193/193 is correct, the G8 GT cam will be a good addition with 1.9 rockers. Its 200/208 and .278"/.282" at the lobe. With 1.9 rockers, that would be .530"/.536". Thats only a couple degrees shy of the LS3 cam (204/211). Car Craft put an LS3 cam in a 5.3 truck engine and it picked up 90hp at 6500!!! It only lost 18ft.lbs. at 3500. Im thinking a properly installed L76 cam would lose nothing at the bottom and gain maybe 80hp at the top. Looking at valve events, if the L76 cam was retarded 4deg, it would mimic tge LS3 cam events for intake opening and exh closing and could possibly make very nearly the same power.
Next question, what does a typical stock LS4 dyno at the wheels?
Thanks for the link, but there are some erroneous numbers there for duration. But if the 193/193 is correct, the G8 GT cam will be a good addition with 1.9 rockers. Its 200/208 and .278"/.282" at the lobe. With 1.9 rockers, that would be .530"/.536". Thats only a couple degrees shy of the LS3 cam (204/211). Car Craft put an LS3 cam in a 5.3 truck engine and it picked up 90hp at 6500!!! It only lost 18ft.lbs. at 3500. Im thinking a properly installed L76 cam would lose nothing at the bottom and gain maybe 80hp at the top. Looking at valve events, if the L76 cam was retarded 4deg, it would mimic tge LS3 cam events for intake opening and exh closing and could possibly make very nearly the same power.
Next question, what does a typical stock LS4 dyno at the wheels?
To answer you question though I believe a tuned, mainly stock LS4 will put down between 260 and 270 at the wheels.
#7
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#8
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Yes, thats me. There's only one Pontiacjeff! Ha!
Thanks for the link, but there are some erroneous numbers there for duration. But if the 193/193 is correct, the G8 GT cam will be a good addition with 1.9 rockers. Its 200/208 and .278"/.282" at the lobe. With 1.9 rockers, that would be .530"/.536". Thats only a couple degrees shy of the LS3 cam (204/211). Car Craft put an LS3 cam in a 5.3 truck engine and it picked up 90hp at 6500!!! It only lost 18ft.lbs. at 3500. Im thinking a properly installed L76 cam would lose nothing at the bottom and gain maybe 80hp at the top. Looking at valve events, if the L76 cam was retarded 4deg, it would mimic tge LS3 cam events for intake opening and exh closing and could possibly make very nearly the same power.
Next question, what does a typical stock LS4 dyno at the wheels?
Thanks for the link, but there are some erroneous numbers there for duration. But if the 193/193 is correct, the G8 GT cam will be a good addition with 1.9 rockers. Its 200/208 and .278"/.282" at the lobe. With 1.9 rockers, that would be .530"/.536". Thats only a couple degrees shy of the LS3 cam (204/211). Car Craft put an LS3 cam in a 5.3 truck engine and it picked up 90hp at 6500!!! It only lost 18ft.lbs. at 3500. Im thinking a properly installed L76 cam would lose nothing at the bottom and gain maybe 80hp at the top. Looking at valve events, if the L76 cam was retarded 4deg, it would mimic tge LS3 cam events for intake opening and exh closing and could possibly make very nearly the same power.
Next question, what does a typical stock LS4 dyno at the wheels?
#9
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Brian Tooley has good price on springs - these are good upgrades without adding too much spring pressure on the DOD lifters..
http://www.briantooleyracing.com/pac...e-springs.html
http://www.briantooleyracing.com/pac...e-springs.html
#10
Yes, I will be installing an LS2 intake and cable operated throttle body. I will be running stock exhaust manifolds, but running true duals with an x-pipe.
#11
Brian Tooley has good price on springs - these are good upgrades without adding too much spring pressure on the DOD lifters..
http://www.briantooleyracing.com/pac...e-springs.html
http://www.briantooleyracing.com/pac...e-springs.html
#12
Good Stuff here with the mini van swap.....
My project will potentially be a 2005 Buick Terraza AWD.
It is the 3.5 with a 4l65 and a transfer case of some kind.....
I am hoping to do an ls4 with a small turbo.....
Any suggs or advise on the swap would be very much appreciated!!!!
How about posting some in progress pics of the Montana????
(I am happy to know that I am not the only one here thinking this way!!!)
It is the 3.5 with a 4l65 and a transfer case of some kind.....
I am hoping to do an ls4 with a small turbo.....
Any suggs or advise on the swap would be very much appreciated!!!!
How about posting some in progress pics of the Montana????
(I am happy to know that I am not the only one here thinking this way!!!)
#18
You didn't own THIS Montana! GXP front.Bilstein suspension and 13" brakes, GXP 12" rear disc brakes, custom 1-5/16 front sway bar w urethane bushings and endlinks, custom 1" rear swaybar that links the rear axle beam to the rear frame rails aft of the suspension virtually eliminates body roll. Bilstein rear shocks (moved the ELC with air bags in the springs), re-inforced rear control arms and boxed panhard rod with urethane bushings. Aluminum front subframe. 17" GP wheels w/235/60/17's. Two-tone Thunder package interior. Class 3 trailer hitch, bolted then welded to rear frame rails. 3800 Series 2 (L36) swap in 2007. And next is this LS4 swap. I am debating using a 4T80E and an electric front mount starter instead of the 4T65 bc I intend to tow a trailer w/my 88 Grand Am drag car.
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You didn't own THIS Montana! GXP front.Bilstein suspension and 13" brakes, GXP 12" rear disc brakes, custom 1-5/16 front sway bar w urethane bushings and endlinks, custom 1" rear swaybar that links the rear axle beam to the rear frame rails aft of the suspension virtually eliminates body roll. Bilstein rear shocks (moved the ELC with air bags in the springs), re-inforced rear control arms and boxed panhard rod with urethane bushings. Aluminum front subframe. 17" GP wheels w/235/60/17's. Two-tone Thunder package interior. Class 3 trailer hitch, bolted then welded to rear frame rails. 3800 Series 2 (L36) swap in 2007. And next is this LS4 swap. I am debating using a 4T80E and an electric front mount starter instead of the 4T65 bc I intend to tow a trailer w/my 88 Grand Am drag car.