lt1 with lt4 heads and hot cam
03-04-2015, 09:37 AM
#21
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No reply, just a few questions. I got a lt1 with lt4 intake, 2 and half inch elderbrock headers,MSD everything, bbk 58mm throttlebody, Flowmaster, straight pipes, new 4L60 trany with shift kit and switch to control the firmness, high flow oil pump, fan mod to control fans. With bypass if I forget to turn them on and 373 rear end. Ss ram air hood with kn filter. What else can I do to get me above 400hp??? I heard hot cam , springs and 1.6 rockers. Could get me over that. Around 360hp now.
03-04-2015, 11:56 AM
#22
Melting Slicks
How about a optimized package from here?? They also have a great Youtube video on the CnC process.
http://advancedinduction.com/LTX/AiLTxHeadsCamKits.php
http://advancedinduction.com/LTX/AiLTxHeadsCamKits.php
03-04-2015, 12:23 PM
#23
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[QUOTE=illenema;1589102920]How about a optimized package from here?? They also have a great Youtube video on the CnC process.
http://advancedinduction.com/LTX/AiLTxHeadsCamKits.php[/QUOTE
should I port my Lt1 heads as well?
http://advancedinduction.com/LTX/AiLTxHeadsCamKits.php[/QUOTE
should I port my Lt1 heads as well?
03-04-2015, 05:05 PM
#24
Drifting
LT4 hotcam kit is great all around package in my opinion. Are there better cam that make more power? yes. But, it's a inexpensive kit that will have great street manners even using LT1 heads. Also, you wont have to rev the crap out of it to make power.
For me tuners for obd1 are few and far around here, but a mail order tune would be fine for a combination that has been used many times, especially for a company like PCM for less. I'd say go for it
For me tuners for obd1 are few and far around here, but a mail order tune would be fine for a combination that has been used many times, especially for a company like PCM for less. I'd say go for it
03-04-2015, 05:27 PM
#25
Melting Slicks
[QUOTE=countryboychevy;1589103099]
Those are Lt-1 heads in the video
Will have to port intake
How about a optimized package from here?? They also have a great Youtube video on the CnC process.
http://advancedinduction.com/LTX/AiLTxHeadsCamKits.php[/QUOTE should I port my Lt1 heads as well?
http://advancedinduction.com/LTX/AiLTxHeadsCamKits.php[/QUOTE
should I port my Lt1 heads as well?Will have to port intake
03-05-2015, 01:00 PM
#26
03-05-2015, 03:47 PM
#27
With AI LT1 200 heads the stock intake and TB are fine. When I did mine they said portng intake on a stock short block would be a waste of time and money. I agree with Tom
03-05-2015, 04:08 PM
#28
I know that gears don't increase torque. But gears will feel like you have more torque. Ever notice that the L98 has more torque than the LT1? But the LT1 has more horse power. That's why at most auto cross events, L98's do better than LT1s. Go to a road course and the L98 is much slower than the LT1. (we're talking OEM). So, my question is still how do you increase torque in a LT1 other than stroking?
03-06-2015, 02:22 AM
#29
Le Mans Master
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Cams. If the Hot Cam is too hot then the next step down is the ZZ4 cam #10185071. I dont know if it has the correct hole in the cam face to drive your water pump shaft - u would have to research this. But im sure it has the shorter pin for your timing gear. I would run this cam with 1.6 rockers on the intakes only and 1.5 rockers on the exh. But this cam would match your stock heads very well also as the LT1 head is a low lift head and anything over 0.500" lift does nothing. But u need to change springs on the stock LT1 heads for anything over something like 0.46" lift to prevent coil bind (installed height - solid height - 0.060" safety margin).
Ok heads. I think the 195cc intake runners of the LT4 heads are a bit much for a 350 and not what u want if u want torque and low rpm power. For a little less money u can buy AFR 180cc LT1 "Eliminator" Street Head and a better match for your usage. Plenty of good aftermarket heads for the LT1 but make sure u maintain your compression ratio with 55cc chambers. I read of several nice LT1 heads but with larger chambers they wont maintain the power more so at low rpm. Everyone knocks them but even the Eldelbrock Performer LT1 heads out flow the stock LT1 heads and at a little over $1000 u cant beat the price - tight chambers and tight runners will work best on the street at low rpm.
I may get beat up for this but for a small step in performance with street manners the ZZ4 cam ($225 and uses all your stock lifters and hardware) and the Edlebrock Performer heads ($1050 comes with better vlv springs too) will get the job done and save u a lot of $$$.
Hope this helps ya.
Ok heads. I think the 195cc intake runners of the LT4 heads are a bit much for a 350 and not what u want if u want torque and low rpm power. For a little less money u can buy AFR 180cc LT1 "Eliminator" Street Head and a better match for your usage. Plenty of good aftermarket heads for the LT1 but make sure u maintain your compression ratio with 55cc chambers. I read of several nice LT1 heads but with larger chambers they wont maintain the power more so at low rpm. Everyone knocks them but even the Eldelbrock Performer LT1 heads out flow the stock LT1 heads and at a little over $1000 u cant beat the price - tight chambers and tight runners will work best on the street at low rpm.
I may get beat up for this but for a small step in performance with street manners the ZZ4 cam ($225 and uses all your stock lifters and hardware) and the Edlebrock Performer heads ($1050 comes with better vlv springs too) will get the job done and save u a lot of $$$.
Hope this helps ya.
Last edited by cardo0; 03-06-2015 at 02:24 AM. Reason: add mfr AFR
03-06-2015, 10:41 AM
#30
Burning Brakes
I have a hotcam with fastburn heads (210cc intake runners) and converted lt4 intake manifold. Great low and mid range torque and will spin easily to 6k rpms. The hotcam is a good street cam. It will idle at 750 rpm's and not wish you were driving something else in stop and go traffic. (Been there before.)
03-06-2015, 04:52 PM
#31
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I have a hotcam with fastburn heads (210cc intake runners) and converted lt4 intake manifold. Great low and mid range torque and will spin easily to 6k rpms. The hotcam is a good street cam. It will idle at 750 rpm's and not wish you were driving something else in stop and go traffic. (Been there before.)
03-11-2015, 11:52 AM
#32
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Need help
[QUOTE=tombrammer;1589112064]ok I have a lt4 intake on my Lt1 heads, works great and lots of power. Other problems now with 4l60E tranmission. I have a b&m shifter kit in my 95 camaro. It isn't shifting right. I believe it's the clutches. If you drive the speed and don't stomp the gas to the floor. It shifts ok. But when you stomp it, if it's in over drive it acts like it's slipping gears. if you let off the gas it goes it. Now if I'm stopped and go to pull out fast 1 gear spins and when it goes into 2 it acts like it slips. I'm pretty sure the guy I bought it off of that had the b&m shift kit put in, did not change the clutches in it when it was Installed. WHAT DO YOU GUYS THINK MY PROBLEM IS?
03-11-2015, 05:06 PM
#33
Team Owner
Pro Mechanic
11-28-2015, 10:15 PM
#35
Le Mans Master
They have identical peak torque. Because of the low speeds at most autocross events, high power figures don't make much difference because even an L98 has enough power to spin the tires coming out of a corner at low speeds. It's not because L98s have any kind of magical torque potions.
Lots of ways. Others have already noted that different cams can make a big difference. Although more lift is important, there are lots of other valvetrain aspects that also matter. Bigger valve diameter, increased initial valve acceleration off the seat, overlap, and intake timing all can increase low and midrange power. Also, increasing compression makes a big difference, as does porting jobs that are intended to increase intake velocity instead of massive intake volumes.
I agree with the others who say that the LT4 setup will not be the most cost-effective way to address the OP's goals. He is on the right track by looking at mild aftermarket heads or getting his stock LT1 heads ported, and then looking at cams. A stroker kit will be a quantum leap up in cost, and it will require even more expensive heads to breathe well. Not that I have anything against stroker kits - I have one! It's just a different ballpark of commitment than the OP was looking for.
So, my question is still how do you increase torque in a LT1 other than stroking?
I agree with the others who say that the LT4 setup will not be the most cost-effective way to address the OP's goals. He is on the right track by looking at mild aftermarket heads or getting his stock LT1 heads ported, and then looking at cams. A stroker kit will be a quantum leap up in cost, and it will require even more expensive heads to breathe well. Not that I have anything against stroker kits - I have one! It's just a different ballpark of commitment than the OP was looking for.
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Tom400CFI (11-29-2015)
11-29-2015, 12:30 PM
#37
Team Owner
Pro Mechanic
They have identical peak torque. Because of the low speeds at most autocross events, high power figures don't make much difference because even an L98 has enough power to spin the tires coming out of a corner at low speeds. It's not because L98s have any kind of magical torque potions.
