i have searched, probably not enough though. i recently purchased a 081 heads with 2.02 int and 1.60 exh. stainless steel valves, screw in rocker studs, the springs are double 1.437, and 1.6 rr. what size cam can i get with that setup? need some suggestions. computer tuning will come later on down the road once my money gets back up.

 

LT4 HOT CAM nuff said.

 

I got a LT4 hot cam, don't think you going to put this cam in a drive away, Bigger fuel pump 80 plus injectors and higher fuel pressuer and a **** lot of tuning is needed and if you got an auto a stall is a very good idea. hell I've been mesing with my combo fo over a year and still don't have it down with the tuning( part of this could be bacause I'm retarted).
If this is your first time tuning a EFI I would go with a very mild cam. Once you put a cam in there is nothing but tuning to get it right so you might want to make a change of plans. One day I did not lock a chip down right and ithe motor fired up on the back up cailbration and it did idle at 500 but after a few seconds it started a nasty back fire. I would never even try to drive a LT4 hot cam with the stock chip unless your really into building new engines.

 

I don't believe those big valve heads will even fit your 305. They may not clear, but even if they do clear you'll have massive valve shrouding. Biggest combination I'd run on a 305 is 1.94/1.60

 

do you know anyone running big valves like that. did they have any problems. now if the valves are to big is there away to take the intake valve out and put the smaller 1.94 valve in? or would i just have to buy new heads again? yes i planning on getting a ship burned. i found the aldl cables. now i just need to down load the software to my labtop.

 

You will have problems with the 2.02 valves, you don't want them. Even if they do fit you won't make good power, or at least any increase in power because of the massive amount of valve shrouding you'll get. You want a new set of heads with the 1.94 valves in them, you can't fit them into these heads.

 

I agree completely and for this reason I believe you are better off keeping the stock valve size and having the valves back-cut. This provides a substantial increase in flow when combined with simple DIY porting.

100% false. You do not want to run a hot cam unless you are truly prepared for it. This includes motor mods and tuning "know how". You cannot throw in a hot cam and expect it to run mechanically or electronically. The valve lift is way to extreme for the stock heads and you would be required to have the guides cut to accomodate the high lift of that cam. Even at that you would also risk pulling out the stock pressed in studs with that cam. Statements like this come from those who have never seen an LO3 idle with the stock tune and a cam swap. Even with a mild LT1 cam an LO3 will idle and run like death with said tune.

 

well before everybody starts throwing stones at me for my comment I meant for him to get that cam provided he did get EVERYTHING set up for it. By no means did I say just throw it in and run with it. I know that he`ll need QUITE abit of tuning and head prep too get it running perfectly,I was just throwing out an option.

 

Nevertheless, even with it tuned, I dont think the Hot cam is the best choice for a 305 with stock GM heads. I could see using it with some great flowing heads, or maybe even Vortec heads, but I think it's too much cam for a stock 081 headed 305. I've got the ZZ4 in mine, I like its powerband.

 

Bron I forget

have you got it back on the road now?

 

With a 305, and heads. IF you are compentant tuner, and your heads are set up, and the motor is fairly fresh. I would shoot for something in the 210/220 .480 lift or more. Go with 112 or higher LSA.

I'm currently running a 206/216 .447 .447 112 cam. It is good for a stock motor with miles on it. Unless it is a fairly new motor, I wouldn't go too much bigger than I have, the powerband will get to the point that you don't want to be turnning the motor to.

 

John............I feel your pain

I have around 197K on the shortblock.

That's why so many 350 questions from me lately.

 

To be honest i'm beginning to hate my camaro DM haha. Seems like all I do is swear it at lately. I got everything back together and running and it ran perfect, absolutely flawless right away. Ran like that for 2 days, I got on it a little bit and the windshield steamed up out of nowhere and I saw the heater core dripping onto the carpet.

The wires to the ECM got wet with coolant and now it won't run right at all, its running horrible. Took the ECM out, cleaned out, cleaned the connectors, checked all grounds, its running really "odd" sometimes flickering the SES light, sometimes not. It won't idle, it just dies. Have a feeling I fried the ECM, but I don't want to have to replace it because i have a PROMinator soldered onto this one! Grr I just came in now because i tried sorting some stuff out and tried to start it and the brand new battery is dead now. Here we go again... Did I mention that after I started it up after putting the heads on the alternator went out and i had to get a new one? Everything is breaking at once, it's real fun. *end of rant*

 

That is too funny. I'm at 197K and some change.

I have a 327 in my garage, waiting for money to get machined, and built up to handle some serious turbo-charging. If you are going small block, go big-bore.

 

Dayum........what a bitch about the ECU. I just did the heater core thing a few months ago so I feel your pain on that one also.

FYI.......I got to all the bolts on the heater cover from the floorboard without taking out the dash pad as some have had to do. I never had done it before and the worst thing about it was having to twist around in the underdash area and being almost 6ft-200lbs. There is one bolt on the very top of the unit that you will have to get a "feel" for to get the socket with a 6" IIRC extention on there. But it only took around 2 hours my 1st try to do the whole job. Just don't get frustrated and do a Ken Shamrock with the core trying to get it out or back in. (Don't ask me why )

 

Yep........I've got an almost new crate L31 shorblock that only needs a sleeve and I think some forged pistons.