Lt-4
Crank? Sure. Wheels? Probably not.
There are much better options out there than the dated LT4 technology for the money. For example, www.advancedinduction.com
There are much better options out there than the dated LT4 technology for the money. For example, www.advancedinduction.com
......prolly not.. do some reading on here and see what people have done..
I had a friend who just got rid of a 93 Z with LT4 H/C/I and MY full bolt on 6spd car would run right next to him on hwy..
Its prolly possible with the LT4 heads and intake with a DIFFERENT cam...
I had a friend who just got rid of a 93 Z with LT4 H/C/I and MY full bolt on 6spd car would run right next to him on hwy..
Its prolly possible with the LT4 heads and intake with a DIFFERENT cam...
The LT4 heads are not as good as the bench racers want you to believe.
Some threads got deleted but a guy who was rabidly defending the LT4 package in the last week just admitted he ran 13.4 at 102 and asked for help. Moral of the story, those who shout about how great the LT4 package is, just don't know any better. Look around, lots of LT4 heads out there but they are NOT the ones with outstanding results.
Some threads got deleted but a guy who was rabidly defending the LT4 package in the last week just admitted he ran 13.4 at 102 and asked for help. Moral of the story, those who shout about how great the LT4 package is, just don't know any better. Look around, lots of LT4 heads out there but they are NOT the ones with outstanding results.
i have a LT4 corvette with only a hotcam/tune/free mods. the car trapped 116mph with unported heads. ET was only a 12.2 due to the stock 98k mile clutch and street tires
the LT4 heads can perform, but there are better options out there for the $
the LT4 heads can perform, but there are better options out there for the $
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.LT4 package, like most aftermarket LTX stuff, is garbage out of the box. They do have more potential then LT1 heads for porting, but not much and the performance difference really is not worth the price difference.
If you have the money to send everything to be ported, then sure get the LT4 conversion. If not, then running the heads and intake "as-is" along with the hotcam and expecting big power and great ETs is a HUGE newbie mistake.
I know 4 is a higher number then 1 and everything, but this LT4 stuff is getting rediculous. I can totally understand the hotcam kit for a street car since it is a cheap, complete and reliable setup with little room for error...but for the life of me I can't see why people would do full head/intake/cam LT4 swaps.
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and there have been a few people to break 500rwhp with ported LT1 castings. And the statement in bold just blows my mind.
9 Second Club
Joined: Apr 2009
Posts: 160
Likes: 0
From: Lake Tahoe, CA
Damn you guys come down hard on the only guy in here in the SINGLE DIGITS. Man, if anyone in here were half way quick i'd probably be offended. 
On another note, can't wait till the next friday, hoping to hit 8's!
On another note, can't wait till the next friday, hoping to hit 8's!
Most of us are not building racecars. Most of us build street cars we happen to race a little. What works in each application is not necessarily the same. Besides the fact the rest of us thought it was fairly clear the conversation was about as cast GM LT4 heads. Not about aftermarket heads that were certainly ported.
My car drove the wife and friends to dinner tonight, put 70 miles on it today, how about your's??
If building a dedicated racecar the AFR 227s can certainly work but nobody with a clue would recommend them for a street 350 on the stock engine management which seems to be what the OP is after.
My car drove the wife and friends to dinner tonight, put 70 miles on it today, how about your's??
If building a dedicated racecar the AFR 227s can certainly work but nobody with a clue would recommend them for a street 350 on the stock engine management which seems to be what the OP is after.
Teching In
Joined: Feb 2009
Posts: 23
Likes: 0
From: East Tenn
Wow, I have the same thing. I trapped 115.5mph 12.3 with the hotcam, unported LT4 heads on a 98k mile stock clutch/STOCK longblock. Heads have never been off my car.
Apples to apples the LT4 heads are superior to LT1 heads. The Hot cam is too small to show their potential. To get the most out of them you need more cam and an aftermarket computer.
other than the hotcam and tune, alls my car has is:
- cut filter lid
- 160* stat
- muffler elims
- portmatched intake manifold
- Comp springs (in case i decide to go bigger with the cam later)
still on the factory exhaust manifolds, catback, 3.45 gears, TB, rockers, short block, you name it
the LT4 heads/hotcam combo might not be the best thing out there for LTXs, but you cant argue with my 116.39mph trap speeds with no other supporting boltons. theresd a guy on www.corvetteforum.com whos gone as fast as 11.65 on his unported LT4 heads/hotcam combo Vette. he does have 4.10s, full exhaust, and an aftermarket clutch. do a search for "Jonecap"
im looking for high 11s and 118mph traps when i replace the clutch and add a short throw shifter and a set of DRs. all with the "wimpy" hotcam and unported LT4 heads
Last edited by tpivette; May 26, 2009 at 02:26 AM.
Curb weight on a Vette is 32-3350, pretty light to me seeing as curb weight on my pig is 4060.
GIZMO, I think you will agree the untouched stock shortblock wont handle the rpms needed to make them actually work. Pretty big detail seeing as that is where most of us start, most of us stick with the GM computer long as we are staying below 7-7200rpms too.
GIZMO, I think you will agree the untouched stock shortblock wont handle the rpms needed to make them actually work. Pretty big detail seeing as that is where most of us start, most of us stick with the GM computer long as we are staying below 7-7200rpms too.
Teching In
Joined: Feb 2009
Posts: 23
Likes: 0
From: East Tenn
Bout everything is light compared to the B bodies.
Apples to oranges comparo anyways.
tpivette, I'm a regular over there on the 'other' forum but my habdle there is Dr Evil. I know about and have talked to jonescap quite a bit. Him going 11.70s with our setup is very impressive.
. My crotch rocket runs mid 10s with only two mods - a muffler and a $20 dollar front sprocket...does that make my opinions on LTX parts more reliable?I love GNs, but an LTX and turbo v6 are two very different things.
Bout everything is light compared to the B bodies.
Apples to oranges comparo anyways.
tpivette, I'm a regular over there on the 'other' forum but my habdle there is Dr Evil. I know about and have talked to jonescap quite a bit. Him going 11.70s with our setup is very impressive.
Apples to oranges comparo anyways.
tpivette, I'm a regular over there on the 'other' forum but my habdle there is Dr Evil. I know about and have talked to jonescap quite a bit. Him going 11.70s with our setup is very impressive.
What do you think my car would run if I took 700-800lbs off??? Seems to me that would have a real impact on performance.
My '94 Z28 is currently 900 LBS lighter than your Caprice. I don't know how I would approach racing a B Body at the track. That's a hell of a challenge to make it quick and fast.