wILL THE lt4
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From: Pittsburgh, PA
wILL THE lt4 Hot cam kit work in my 98 fullsize chevy truck. Its the 5.7 vortec and I was wondering if the springs will fit right on my vortec heads. Will there be any machine work needed for the valve springs being the heads are vortec ehads not LT4 or LT1 heads
You might want to do a whole lot more research. I met a guy at the track with a HOT cammed 2wd LT1ed Chevy with heads and he was just 1-2 tenths faster than my smaller cammed no header Caprice with him on slicks. Once I did headers I am MUCH faster. The Vortec heads are standard coolant flow copies of the iron b-body LT1 heads, your vehicle weight is closer to that of mine(4300lbs. race weight) so you would probably better off looking to the b-body crowd for advise than the f-body just because it is closer to what you are actually doing. On the LT4 springs they work on the LT4 heads with the HOT cam because the LT4 Valves are lighter, with regular valves they are really marginal.
Also consider a HOT cam in 4000+lbs. in a b-body with 27" tire requires a bare minimum 2400 stall and 3.42s with 2800/3.73s being better, I would expect your weight to be similar and your tires to be taller. I would suggest a different cam like the GMPP 845 or Crane 210/224, both will benifit from gear and stall but will not rquire so much.
Also consider a HOT cam in 4000+lbs. in a b-body with 27" tire requires a bare minimum 2400 stall and 3.42s with 2800/3.73s being better, I would expect your weight to be similar and your tires to be taller. I would suggest a different cam like the GMPP 845 or Crane 210/224, both will benifit from gear and stall but will not rquire so much.
Staging Lane
Joined: Dec 2005
Posts: 53
Likes: 0
Originally Posted by 96capricemgr
You might want to do a whole lot more research. I met a guy at the track with a HOT cammed 2wd LT1ed Chevy with heads and he was just 1-2 tenths faster than my smaller cammed no header Caprice with him on slicks. Once I did headers I am MUCH faster. The Vortec heads are standard coolant flow copies of the iron b-body LT1 heads, your vehicle weight is closer to that of mine(4300lbs. race weight) so you would probably better off looking to the b-body crowd for advise than the f-body just because it is closer to what you are actually doing. On the LT4 springs they work on the LT4 heads with the HOT cam because the LT4 Valves are lighter, with regular valves they are really marginal.
Also consider a HOT cam in 4000+lbs. in a b-body with 27" tire requires a bare minimum 2400 stall and 3.42s with 2800/3.73s being better, I would expect your weight to be similar and your tires to be taller. I would suggest a different cam like the GMPP 845 or Crane 210/224, both will benifit from gear and stall but will not rquire so much.
Also consider a HOT cam in 4000+lbs. in a b-body with 27" tire requires a bare minimum 2400 stall and 3.42s with 2800/3.73s being better, I would expect your weight to be similar and your tires to be taller. I would suggest a different cam like the GMPP 845 or Crane 210/224, both will benifit from gear and stall but will not rquire so much.
See there is the problem people reset a REAL complete answer. Some guys have had the LT4 springs fit the iron LT1 heads which the Vortecs are modled after so by your logic the correcty answer is maybe and that ignores the fact that even if they fit they are a poor choice. Sometimes it is the questions not asked that need answering.
Actually now that I look you dredged this up from WAY back in the archives so it is probably way too late for any of us to help him.
Actually now that I look you dredged this up from WAY back in the archives so it is probably way too late for any of us to help him.
Actually he's right not you.
The Bowtie Vortec heads don't need any maching to get a set of springs on the heads, they come assembled with the LT4 springs out of the box.
The stock OEM Vortec heads that are on his truck can't take a LT4 (12551483) spring without cutting the spring pockets for them.
They are NOT THE SAME CASTINGS WITH A DIFFERENT WATER PASSAGE as the LT1 Iron heads. They might have similar port cores and chambers but the overall casting is not the same.
Please don't jump on someones nuts when you don't know something for sure.
Bret
The Bowtie Vortec heads don't need any maching to get a set of springs on the heads, they come assembled with the LT4 springs out of the box.
The stock OEM Vortec heads that are on his truck can't take a LT4 (12551483) spring without cutting the spring pockets for them.
They are NOT THE SAME CASTINGS WITH A DIFFERENT WATER PASSAGE as the LT1 Iron heads. They might have similar port cores and chambers but the overall casting is not the same.
Please don't jump on someones nuts when you don't know something for sure.
Bret
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I should have said based on the iron LT1 heads not copies, you got me there. Don't know where you came up with the Bowtie Vortec reference and I did agree that the springs most likely wouldn't fit(in saying only some found them to actually fit) and went a step further in saying even if they did they were a poor choice.
You spend enough time on forums that I am sure you will agree that it is often the case that the question NOT ASKED is the one that needs answering.
You spend enough time on forums that I am sure you will agree that it is often the case that the question NOT ASKED is the one that needs answering.
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First off on the vortec heads there is not enough retainer to guide clearence on them,If he goes and sticks the hotcam in even with 1.5 rockers the retainers are going to smash the valve guide the vortecs in stock trim are only good for cams up to .480 lift machining work will be required to cut the guide down for proper clearence.I know all this because i had vortecs on my 71 camaro
Staging Lane
Joined: Dec 2005
Posts: 53
Likes: 0
Originally Posted by 96capricemgr
See there is the problem people reset a REAL complete answer. Some guys have had the LT4 springs fit the iron LT1 heads which the Vortecs are modled after so by your logic the correcty answer is maybe and that ignores the fact that even if they fit they are a poor choice. Sometimes it is the questions not asked that need answering.
Actually now that I look you dredged this up from WAY back in the archives so it is probably way too late for any of us to help him.
Actually now that I look you dredged this up from WAY back in the archives so it is probably way too late for any of us to help him.
LT4 valve spring 12551483, 1.32" dia, 101 lbs @ 1.78" (installed), 332 lbs (open). The dimensions are pretty much the same as the LT1 spring. The retainer to guide clearence would be your biggest problem. If you go to the trouble of pulling the heads, I would update them to LT1 style screw in studs. A little bowl work will help them out alot.
Daren
Daren
Originally Posted by roughneck427
First off on the vortec heads there is not enough retainer to guide clearence on them,If he goes and sticks the hotcam in even with 1.5 rockers the retainers are going to smash the valve guide the vortecs in stock trim are only good for cams up to .480 lift machining work will be required to cut the guide down for proper clearence.I know all this because i had vortecs on my 71 camaro
i know that there are 2 types of votecs for production trucks so that very well could be a difference..
1 set has the ^^^ on the end and the other set does not.the 3 pyramids are what was on his tahoe and 2500 p/u...
1 set has the ^^^ on the end and the other set does not.the 3 pyramids are what was on his tahoe and 2500 p/u...
