is a true lt4 swap worth it
Thread Starter
Teching In
Joined: Apr 2007
Posts: 12
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is a true lt4 swap worth it hey guys i just picked up a 94 z28 m6 with only 60xxx on it and the car runs awsome but i have a chance to pick up a complete built lt4 for a real good price, is it worth doing the swap or not. the motor in hand has about 5xxx on it and here are the specs ( sort of vogue)
lt4 block bord .40 over
SRP forged pistons( 11.1 i think )
lt1 rods
stock balanced crank
lt4 heads workd and port matched intake
545/545 lift comp cam
1.6 rr
30lb injectors
hooker lt
i was told that the motor made a little over 400whp, and the guy i am gettin the motor from is also throwing in a nx progressive nos kit,
i was thinking withi this motor and say a 200 shot the car should be a real fun street ride
thanks for your advice guys
lt4 block bord .40 over
SRP forged pistons( 11.1 i think )
lt1 rods
stock balanced crank
lt4 heads workd and port matched intake
545/545 lift comp cam
1.6 rr
30lb injectors
hooker lt
i was told that the motor made a little over 400whp, and the guy i am gettin the motor from is also throwing in a nx progressive nos kit,
i was thinking withi this motor and say a 200 shot the car should be a real fun street ride
thanks for your advice guys
Thread Starter
Teching In
Joined: Apr 2007
Posts: 12
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thanks yea it has ported and polished heads and intake, and i can get the motor with lt and progressive nos kit for 2000 plus my stock lt1, so the lt4 with the heads worked and cam shoujold make 400 whp
thanks
thanks
The LT4 is not "all that" and even if it made power on the dyno it does not mean it will make a car fast. The LT4 heads are arguably too big for a near stock displacement motor at rpms our pcm is capable of. Even on strokers I am yet to be convinced ported LT4s are worthwhile over ported LT1 castings. Look for RESULTS rather than some kids who know nothing telling you what you want to hear.
It was not a ZR1 Vette thing it was a Grandsport thing the ZR1 got the LT5 which is not an LT1 derivative.
It was not a ZR1 Vette thing it was a Grandsport thing the ZR1 got the LT5 which is not an LT1 derivative.
Originally Posted by That_guy
do it and kick some ***. The lt4 only came with the zr1 vettes right
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I played with alot of heads on my old 355, going from a LE3 lt1 head to a LE3 lt4 head and intake you can and will tell a pretty good difference. I ran around 4 tenths faster with the lt4 stuff. I was shifting each setup around 6700rpm
Staging Lane
Joined: Feb 2006
Posts: 57
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Originally Posted by 96capricemgr
The LT4 is not "all that" and even if it made power on the dyno it does not mean it will make a car fast. The LT4 heads are arguably too big for a near stock displacement motor at rpms our pcm is capable of. Even on strokers I am yet to be convinced ported LT4s are worthwhile over ported LT1 castings. Look for RESULTS rather than some kids who know nothing telling you what you want to hear.
It was not a ZR1 Vette thing it was a Grandsport thing the ZR1 got the LT5 which is not an LT1 derivative.
It was not a ZR1 Vette thing it was a Grandsport thing the ZR1 got the LT5 which is not an LT1 derivative.
Thread Starter
Teching In
Joined: Apr 2007
Posts: 12
Likes: 0
thanks guys i think i might jsut do it and i have seen slips were it has ran 11.9 all motor and 10.8 on the spray and that was in a full size truck that he had stuffed it in, i dont care if its making all the power that he says it is, all i was wondieng is if the lt4 block and heads are better than the lt1
Originally Posted by My94TransAm
Doesn't the LT4 conversion kit claim 425hp at the motor?
thats just my .02
Originally Posted by scotty230
thanks guys i think i might jsut do it and i have seen slips were it has ran 11.9 all motor and 10.8 on the spray and that was in a full size truck that he had stuffed it in, i dont care if its making all the power that he says it is, all i was wondieng is if the lt4 block and heads are better than the lt1
4 bolt main block, RR's,better crank, more compression,better heads,a cool red intake
https://ls1tech.com/forums/lt1-lt4-modifications/432878-different-lt1-intakes.html
Here is one place we debated it and even Ed Wright agrees with me that on a 350ci motor held below 7200 LT4s are not the right choice.
Now I do not want to sound like I am taking a shot at Ed's accomplishments with his car but with guys like Rick Abare running basically the same times with ported LT1 castings and Mike Harris BRACKET racing his Impala at 10.8 NA both of these guys with AI 200 CC LT1 castings I have to question how much better the LT4s are even on a stroker. Ed's 9.9 is clearly impressive I am not trying to take anything away from his accomplishment, I just think it very interesting one of his customers is running about the same times with LT1 castings.
You people need to drop the bench racing once in awhile and observe reality. Reality is the guys who try to go fast with LT1 castings do go fast, fast enough that those who jump on the LT4/aftermarket bandwagon need to scratch their head a little and rethink their combos.
I am not talking dyno numbers or flow numbers look at real ET/MPH for street cars especially.
This is like the whole AFR thing people say how great something is based on marketing more than anything else, look for results. Ported LT1 castings have to make you take notice when looking at actual performance numbers.
Here is one place we debated it and even Ed Wright agrees with me that on a 350ci motor held below 7200 LT4s are not the right choice.
Now I do not want to sound like I am taking a shot at Ed's accomplishments with his car but with guys like Rick Abare running basically the same times with ported LT1 castings and Mike Harris BRACKET racing his Impala at 10.8 NA both of these guys with AI 200 CC LT1 castings I have to question how much better the LT4s are even on a stroker. Ed's 9.9 is clearly impressive I am not trying to take anything away from his accomplishment, I just think it very interesting one of his customers is running about the same times with LT1 castings.
You people need to drop the bench racing once in awhile and observe reality. Reality is the guys who try to go fast with LT1 castings do go fast, fast enough that those who jump on the LT4/aftermarket bandwagon need to scratch their head a little and rethink their combos.
I am not talking dyno numbers or flow numbers look at real ET/MPH for street cars especially.
This is like the whole AFR thing people say how great something is based on marketing more than anything else, look for results. Ported LT1 castings have to make you take notice when looking at actual performance numbers.
Thread Starter
Teching In
Joined: Apr 2007
Posts: 12
Likes: 0
thanks guys i wasnt trying to get everyone worked up i was just wondeirng if it was a good upgrade from the stock lt1 and 396d1ss do u ever go to bradenton motorsports, from readig your car setup u sound liek the guy that has that bad *** orange f body that is wicked fast
Staging Lane
Joined: Feb 2006
Posts: 57
Likes: 0
Originally Posted by 96capricemgr
https://ls1tech.com/forums/showthread.php?t=432878
Here is one place we debated it and even Ed Wright agrees with me that on a 350ci motor held below 7200 LT4s are not the right choice.
Now I do not want to sound like I am taking a shot at Ed's accomplishments with his car but with guys like Rick Abare running basically the same times with ported LT1 castings and Mike Harris BRACKET racing his Impala at 10.8 NA both of these guys with AI 200 CC LT1 castings I have to question how much better the LT4s are even on a stroker. Ed's 9.9 is clearly impressive I am not trying to take anything away from his accomplishment, I just think it very interesting one of his customers is running about the same times with LT1 castings.
You people need to drop the bench racing once in awhile and observe reality. Reality is the guys who try to go fast with LT1 castings do go fast, fast enough that those who jump on the LT4/aftermarket bandwagon need to scratch their head a little and rethink their combos.
I am not talking dyno numbers or flow numbers look at real ET/MPH for street cars especially.
This is like the whole AFR thing people say how great something is based on marketing more than anything else, look for results. Ported LT1 castings have to make you take notice when looking at actual performance numbers.
Here is one place we debated it and even Ed Wright agrees with me that on a 350ci motor held below 7200 LT4s are not the right choice.
Now I do not want to sound like I am taking a shot at Ed's accomplishments with his car but with guys like Rick Abare running basically the same times with ported LT1 castings and Mike Harris BRACKET racing his Impala at 10.8 NA both of these guys with AI 200 CC LT1 castings I have to question how much better the LT4s are even on a stroker. Ed's 9.9 is clearly impressive I am not trying to take anything away from his accomplishment, I just think it very interesting one of his customers is running about the same times with LT1 castings.
You people need to drop the bench racing once in awhile and observe reality. Reality is the guys who try to go fast with LT1 castings do go fast, fast enough that those who jump on the LT4/aftermarket bandwagon need to scratch their head a little and rethink their combos.
I am not talking dyno numbers or flow numbers look at real ET/MPH for street cars especially.
This is like the whole AFR thing people say how great something is based on marketing more than anything else, look for results. Ported LT1 castings have to make you take notice when looking at actual performance numbers.
430 rwhp (after correcting a high rpm miss...opti)...this is from a port matched set of lt4 heads...gm847...383
What does it run at the track? Dyno numbers do not always mean good ET.
There is a guy on the Impala board who with a 150 shot on his XFI cammed(230/236) ported LT4 setup has equalled my best NA MPH and is slightly behind in ET. His heads flow more than mine and he runs more stall.
The XFI ginds are another example of what is supposed to be the "best" but it is all theory and little to nothing to back it up.
There is a guy on the Impala board who with a 150 shot on his XFI cammed(230/236) ported LT4 setup has equalled my best NA MPH and is slightly behind in ET. His heads flow more than mine and he runs more stall.
The XFI ginds are another example of what is supposed to be the "best" but it is all theory and little to nothing to back it up.
Staging Lane
Joined: Feb 2006
Posts: 57
Likes: 0
Originally Posted by 96capricemgr
What does it run at the track? Dyno numbers do not always mean good ET.
There is a guy on the Impala board who with a 150 shot on his XFI cammed(230/236) ported LT4 setup has equalled my best NA MPH and is slightly behind in ET. His heads flow more than mine and he runs more stall.
The XFI ginds are another example of what is supposed to be the "best" but it is all theory and little to nothing to back it up.
There is a guy on the Impala board who with a 150 shot on his XFI cammed(230/236) ported LT4 setup has equalled my best NA MPH and is slightly behind in ET. His heads flow more than mine and he runs more stall.
The XFI ginds are another example of what is supposed to be the "best" but it is all theory and little to nothing to back it up.