i know that i will need new springs to run this cam. my question is what else willl i need? i have heard i have to have the guides cut, but i dont know. any help will be appreciated.

thanks,

david

 

does anyone know? i know someone has to have expierience with the hotcam and stock heads...

thanks,

david

 

Hey you are in luck!! I just installed my LT4 cam in my LB9 TPI with stock heads and it all worked fine. I have no coil bind and no valve guide interference.



Brian

 

you have bone stock heads, as in you didnt even replace the springs?


p.s. i think i made a mistake... i meant the lt4 hotcam, not just the normal lt4 cam.

 

Now hold on for one second........in the first thread you said LT4 can and in the 2nd you said HOT CAM. I Have both but the standard LT4 I used with Newer stock springs. The Hot Cam in a diffrent story. Let me know what you have and I will let you know all I can.



Brian Felts

 

its the hotcam, sorry about the confusion, and thanks for the patience. i just talked to the guy who will be working on my heads and he said that nothing needs to be done with the guides, all i need is new springs..... is this true?

thanks,

david

 

Well stock heads are knowen for accepting lots of lift. I have the vortec heads and used the LT4 springs and it all worked very well with the Hot Cam. I have taken it to 5600 with no valve float. I have it in a carbed 350 and it is AWESOME in sound and power!!

Now with LB9 heads I did a swap with the standard lt4 cam but used .550 lift single springs and all my machine shop needed to do was add a shim to it and it was fine. The stock guides cleared the .480 lift.

Make sure he measured the guides to be sure and then double check the work when you are setting the valves. I have let this slip by once and destroyed a set of Vortec guides.

Let me know if I can help anymore
Brian

 

how would i check to make sure that it will clear? would he know what to do?

 

Yes he should....give him the cam card if it did not come with one its .525I .525.e with 1.6 rockers You can buy a tool to measure it but a machine shop will be fine. When the heads are on the car you can just look into the inside of the spring and see where the spring retainer is at max lift.



Brian

 

ok so what will i be looking for when i look at the springs when they are on the car? im taking off the heads and bringing them to him, he wont have the car.also, will i need a custom prom, or will it work ok with the stock one?

thanks for all the help,

david

 

Just tell your mechanist to make sure the guides will take .525 lift and ask him to check for coil bind at max lift and you will be fine....I promise you will like the results and you are taking the correct route to get there.


Well the bad news is if you are using a MAP sensor your computer will not like the low Vacuum numbers so you may need a custom prom. I get 12 inches of Vac. at idle (750 RPM) In contrast to the LT4 I had before which is very computer friendly getting 19 inches. The custom prom board guys would be better suited to give you better advice.


Brian

 

ok, thank you for all of the help, really.

david

 

[Hijack warning!]

Brian, how'd you run the HOTcam on the Vortecs with no clearancing? Were you running the 1.6 rockers to go along with the HOTcam or just 1.5s yielding under .500 lift? Most say you don't want to run over .480 on the stock Vortecs without cutting down the guides to get more clearance between them and the retainers, and I have been working on that assumption. Did you run some offset locks along with the LT4 springs or what? (Those don't fit in the stock spring seats either do they?) Or did I misunderstand you and did have some clearancing done?

 

No I ran the LT4 with no clearance on the LB9 Heads. The Hot Cam springs in the Vortec will fit the pocket but you will have to cut the valve guides since the Vortecs will only take .460 lift. I have the HOT in a 355 and the LT4 in my TPI 305. Crane cams have springs to match up with stock seats but if you are going to grind the guides anyway its not a bid problem.



Brian