To all LT4 nay sayer....
Registered User
Joined: Jun 2002
Posts: 2,456
From: sarasota, fl
Originally posted by Fatdog
Lt4 heads.hot cam ,heavy duty timing chain and gears,lt4 intake,headers,with cat=429 hp.This stuff has been around a long time.I just don't have the bread to go that far .Then,there is the trans build-up,and then the rear,and then the suspension to keep the car on the ground.The Lt4 heads are 30+hp right out of the box ,and ft directly onto the LT1.(Can't remember about the throttle body however).If anybody needs the stats,I'll go pull out the old hot rod mag with the article about this.My02
Lt4 heads.hot cam ,heavy duty timing chain and gears,lt4 intake,headers,with cat=429 hp.This stuff has been around a long time.I just don't have the bread to go that far .Then,there is the trans build-up,and then the rear,and then the suspension to keep the car on the ground.The Lt4 heads are 30+hp right out of the box ,and ft directly onto the LT1.(Can't remember about the throttle body however).If anybody needs the stats,I'll go pull out the old hot rod mag with the article about this.My02
FLYWHEEL horsepower.
for about the same price you can get ported LT1 heads, with a larger cam, and make over 400 REAR WHEEL horsepower.
Registered User
Joined: May 2001
Posts: 279
From: Overlandpark, Ks
i would not spend the money on the lt4 heads. you could spend around 700 on your stock castings and get better results and be able to run a bigger cam which would equal to more hp at the wheels.
thomas
thomas
Registered User
Joined: Oct 2002
Posts: 856
From: Denver
2300 will take you a long way. PP stock heads $400-2500, big cam 306 $250, lifter/rods/valves/rockers 800+. You will blast a LT-4 with PP stocker heads and a big cam.
Last edited by 94SLUG; Apr 26, 2003 at 12:08 PM.
Registered User
Joined: Nov 1999
Posts: 541
From: Shreveport La.
My hot cam kit with a $600 gasket matched port job on LT-1 heads made 372 RWHP. So I got that for less than $1000. 
Another thing is, is that GM does not sell bare casting LT-4 heads anymore. You have to buy them complete. Not to mention that if you have an automatic, lt-4's aren't going to work worth the crap anyway unless you have a larger CI bottom end. Thats why all true LT-4 cars came with 6-speeds. Lots of local guys with autos have done the LT-4 conversion and there cars are SLOW. 13.1-13.5's for $2300 sucks. They have all the accompanied mods also. Your money can be much better spent else where. IMO.
Another thing is, is that GM does not sell bare casting LT-4 heads anymore. You have to buy them complete. Not to mention that if you have an automatic, lt-4's aren't going to work worth the crap anyway unless you have a larger CI bottom end. Thats why all true LT-4 cars came with 6-speeds. Lots of local guys with autos have done the LT-4 conversion and there cars are SLOW. 13.1-13.5's for $2300 sucks. They have all the accompanied mods also. Your money can be much better spent else where. IMO.
Thread Starter
Registered User
Joined: Jun 2002
Posts: 1,817
From: O-Town
Where are you guys getting your heads ported for less then $1000? I would like to know so I dont have to spend 1500 on a set of TEA ported heads. Also they pulled 429 with LT4 heads and hotcam with all bolt ons, thats like 370rwhp, good enough to send you to the 12s. If you want more then go with a cc306 sized cam and you will probably be close to 400rwhp without even having the heads ported yet. Beast96z, did you not see that I said that you can get BARE LT4 castings for Tbyrne? Unless they have stoped selling them and havnt updated their website. I would do this if I didnt already have ported heads. Also how many ported LT1 heads do you see that flow over 255-260 peak? Everyone else seems to be doing that except for a few people, TEA and Phil.
I wasnt talking about spending 2300 on the LT4 conversion either. If you look at my breakdown at the top, you can do the LT4 conversion for less then 2000, even after valves, retainers, and seals. You could also use your guide plates from your LT1 heads if you wish and then sell what was left over from the LT1 heads and make back atleast $150.
I wasnt talking about spending 2300 on the LT4 conversion either. If you look at my breakdown at the top, you can do the LT4 conversion for less then 2000, even after valves, retainers, and seals. You could also use your guide plates from your LT1 heads if you wish and then sell what was left over from the LT1 heads and make back atleast $150.
Last edited by mastrdrver; Apr 26, 2003 at 04:30 PM.
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Joined: Jul 2002
Posts: 276
From: Bloomfield Hills, Mi.
I don't know if you saw my post or not but you will not get 400rwhp with a cc306 cam and unported heads. I would probably be at 370 or 375 at the wheels on a dyno jet the way I am now. That is with pretty much every bolt on plus. This is also dyno tuned. I am shooting for 400rwhp after the heads are done next winter.
Don't get me wrong I love this set up and it's potential, but if it didn't already come with the lt4 in it, I would be porting out my stock lt1 heads that were in the last car.
I would probably be at 370 or 375 at the wheels on a dyno jet the way I am now. That is with pretty much every bolt on plus. This is also dyno tuned. I am shooting for 400rwhp after the heads are done next winter. Don't get me wrong I love this set up and it's potential, but if it didn't already come with the lt4 in it, I would be porting out my stock lt1 heads that were in the last car.
Registered User
Joined: Oct 2002
Posts: 856
From: Denver
Originally posted by mastrdrver
Where are you guys getting your heads ported for less then $1000? I would like to know so I dont have to spend 1500 on a set of TEA ported heads. Also they pulled 429 with LT4 heads and hotcam with all bolt ons, thats like 370rwhp, good enough to send you to the 12s. If you want more then go with a cc306 sized cam and you will probably be close to 400rwhp without even having the heads ported yet. Beast96z, did you not see that I said that you can get BARE LT4 castings for Tbyrne? Unless they have stoped selling them and havnt updated their website. I would do this if I didnt already have ported heads. Also how many ported LT1 heads do you see that flow over 255-260 peak? Everyone else seems to be doing that except for a few people, TEA and Phil.
I wasnt talking about spending 2300 on the LT4 conversion either. If you look at my breakdown at the top, you can do the LT4 conversion for less then 2000, even after valves, retainers, and seals. You could also use your guide plates from your LT1 heads if you wish and then sell what was left over from the LT1 heads and make back atleast $150.
Where are you guys getting your heads ported for less then $1000? I would like to know so I dont have to spend 1500 on a set of TEA ported heads. Also they pulled 429 with LT4 heads and hotcam with all bolt ons, thats like 370rwhp, good enough to send you to the 12s. If you want more then go with a cc306 sized cam and you will probably be close to 400rwhp without even having the heads ported yet. Beast96z, did you not see that I said that you can get BARE LT4 castings for Tbyrne? Unless they have stoped selling them and havnt updated their website. I would do this if I didnt already have ported heads. Also how many ported LT1 heads do you see that flow over 255-260 peak? Everyone else seems to be doing that except for a few people, TEA and Phil.
I wasnt talking about spending 2300 on the LT4 conversion either. If you look at my breakdown at the top, you can do the LT4 conversion for less then 2000, even after valves, retainers, and seals. You could also use your guide plates from your LT1 heads if you wish and then sell what was left over from the LT1 heads and make back atleast $150.
Street and strip in Miami will get you in the 255- 260s for 500bucks.
Registered User
Joined: Oct 2002
Posts: 856
From: Denver
Originally posted by mastrdrver
Where are you guys getting your heads ported for less then $1000? I would like to know so I dont have to spend 1500 on a set of TEA ported heads. Also they pulled 429 with LT4 heads and hotcam with all bolt ons, thats like 370rwhp, good enough to send you to the 12s. If you want more then go with a cc306 sized cam and you will probably be close to 400rwhp without even having the heads ported yet. Beast96z, did you not see that I said that you can get BARE LT4 castings for Tbyrne? Unless they have stoped selling them and havnt updated their website. I would do this if I didnt already have ported heads. Also how many ported LT1 heads do you see that flow over 255-260 peak? Everyone else seems to be doing that except for a few people, TEA and Phil.
I wasnt talking about spending 2300 on the LT4 conversion either. If you look at my breakdown at the top, you can do the LT4 conversion for less then 2000, even after valves, retainers, and seals. You could also use your guide plates from your LT1 heads if you wish and then sell what was left over from the LT1 heads and make back atleast $150.
Where are you guys getting your heads ported for less then $1000? I would like to know so I dont have to spend 1500 on a set of TEA ported heads. Also they pulled 429 with LT4 heads and hotcam with all bolt ons, thats like 370rwhp, good enough to send you to the 12s. If you want more then go with a cc306 sized cam and you will probably be close to 400rwhp without even having the heads ported yet. Beast96z, did you not see that I said that you can get BARE LT4 castings for Tbyrne? Unless they have stoped selling them and havnt updated their website. I would do this if I didnt already have ported heads. Also how many ported LT1 heads do you see that flow over 255-260 peak? Everyone else seems to be doing that except for a few people, TEA and Phil.
I wasnt talking about spending 2300 on the LT4 conversion either. If you look at my breakdown at the top, you can do the LT4 conversion for less then 2000, even after valves, retainers, and seals. You could also use your guide plates from your LT1 heads if you wish and then sell what was left over from the LT1 heads and make back atleast $150.
Street and strip in Miami will get you in the 255- 260s for 500bucks.
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Originally posted by mastrdrver
Where are you guys getting your heads ported for less then $1000? Also how many ported LT1 heads do you see that flow over 255-260 peak? Everyone else seems to be doing that except for a few people, TEA and Phil.
Where are you guys getting your heads ported for less then $1000? Also how many ported LT1 heads do you see that flow over 255-260 peak? Everyone else seems to be doing that except for a few people, TEA and Phil.
He is well under 1000 bucks and above 255-260cfm.
Registered User
Joined: Jul 2002
Posts: 276
From: Bloomfield Hills, Mi.
Yes the 370 was on a mustang dyno but I no for a fact that those numbers are spot on. There were three z06's that dynoed before me that pulled 345 to 350 and with the drivetrain loss that is rate on the money. There was also a 2003 cobra rate of the showroom floor that pulled 355 to the wheels.
Most of the stock LS1's were any where from 290 to 313, Jason Deblers being the 313. LS1 Corvette's were pulling between 320 and 328 with very minor things done to them. Those are the real world numbers.
Most of the stock LS1's were any where from 290 to 313, Jason Deblers being the 313. LS1 Corvette's were pulling between 320 and 328 with very minor things done to them. Those are the real world numbers.
Last edited by ur2slow; Apr 28, 2003 at 06:42 AM.
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