F-Body Europe

Anyone who may know. Does the LT4 timing chain require a different timing chain cover? I thought I heard it did but i'm not sure.

LT4 extreme duty + stock cover = no problems

the only thing that i couldnt swap over was the intake gaskets, everything else is standard parts and sizes.

off topic, but you will need longer pushrods for the conversion or you'll end up binding things up. A good excuse to get pro-magnum RR's after you screw up the GM ones because of stock pushrods. (atleast that is what I keep telling myself )

Rob appreciate the info. Are you talking about you'll need longer pushrods for the full LT4 conversion kit(heads and intake) Or do you need it just for the timing chain.

I was going to change over to the LT4 heads and intake but I've decided to sway from that just a little bit. I'm sending my LT1 heads and intake stateside to get ported out to a stage 3 setup. I got another set of LT1 heads off of Mikes old setup. To make a long story short the wife knows the LT1 heads are good and would pretty much kill me if I bought the LT4 and had those ported. I thought about lying but I just can't come up with a good excuse. Your prefrence/ is stage 3 to much for every now and then driving?

Ryan, are you still looking for somthing to do on Force protection?

if you convert you will need a differant size pushrod (i know they are longer, but dont have the spec off hand)

the timeing change plugs right up not prob (it is a cloyes single roller aka LT4 timing chain)

I wouldnt sweat the diff between LT1/LT4 ported they both flow well, except you cant use the spiffy red intake. Stage III other than costing alot I couldnt tell you. My instincts say its more CFM than I need on a NA street car. But I honestly dont know.

I have not found a LT1 to beat up the HAWK yet good luck. I am just talking smack if you beat me good job but it will take more and me sleeping for 2 seconds at te light. maybe I am pushing it but I plan to run high 10's next week I hope. Tuning is done and she runs hard.

Good info Rob- I'm not going to Lie I like the spiffy red intake but I'll pass for the more power option. After I saw the pics of your engine I was almost tempted to paint my intake red instead of black:)


Bruce don't you LS1 guys have your own forum. If you don't know where it is it's the one directly above this one. You know I'm just kidding we all know you LT1 at heart.

My LT4 converted car has stock pushrods, GM rr's and there haven't been any problems during 20 k. miles. When I bought the kit from Paceparts, they said that stock pushrods are ok. Also this is first time I hear that you need new pushrods for this conversion.

So can you be more specific ?

guerardsgt: like said, you can use stock timing cover with LT4 HD timing chain without any problems.

I had to have some other work done on my car, and I had the mechanic (he does most of the GM work in Oklahoma City-read "kick ass power maker") check my valve seals. He speced out the valvetrain and found the pushrods that came with the kit were to short. I didnt get into it as far as specs, (just saw the RR that it chewed up) but it turns out that the rods were to short and it was causeing poor valvetrain geometry.

I believe that Jeff can get you the size of the pr, cuz he got the right stuff the first time. BTW my Hotcam kit was Pace as well, only the Heads/Intake was Scoggin-dickey.

If you arent having problems, then I wouldnt rock the boat. But no more kits for me.

When I bought the LT4 conversion kit in 1999, pushrods were not included and Pace said to use the stock ones.

But still, if anybody can give more information it would be interesting to know.

Thanks

I'm going to purchase the LT4 kit from Pace also. The only thing I want to know is, do you have to get the hotcam and valve springs with the kit. I don't want the hotcam I really want the cc306 and I already have the valve springs.

OTT: What came in the LT4 kit? I'm trying to find out if the LT4 timing chain is included or not. Thanks

Rob do you know of anything else I'll need. I'm going to order it either tonight or monday depends on when there open.

Timing chain was not included, it consisted just complete heads, intake, hotcam kit, all gaskets and LT4 KM. You will get two sets of LT4 springs and retainers, beacuse hotcam kit also includes them. At least this was case with me 3 years ago.

I believe you can purchase heads separately, but better ask from Pace. For performance it may be better idea to port your stock heads if you don't have plans to radically port those LT4 heads.

Like I said, my Hotcam kit from pace was with cam/rr (you dont need this). I bought crane lifters/pushrods/rr, so the only thing i used was the cam. You already have springs, so just get the cam you want. The LT4 heads have adequate at best springs, they are borderline with the hotcam.

Thats it for the cam kit.

Now if you want the Heads they come assembled and i got mine CNC'd for another 2-300 apiece (cant rember exactly), and the Intake. It comes with gaskets, but I would recommend telling them you want Impalla gaskets(bumping CR to 11.2), or just buy a set from fel-pros. You will also get the timing cover, intake, TB, and water pump gaskets.

You might also want to talk to them about getting a EGR block off plate, even though you will have to fab something up for the egr pump itself. Also you will need 2 plugs for the heads. You might be able to get the ones off your old heads (I couldn't) otherwise you will have a class 15 coolant leak.

Thats about it. I didnt buy the one shot one kill package, i got my hotcam from pace and the heads/intake from SDCPA. If you only want the heads/intake that would save your about $400.

[/quote]You might also want to talk to them about getting a EGR block off plate, even though you will have to fab something up for the egr pump itself. Also you will need 2 plugs for the heads. You might be able to get the ones off your old heads (I couldn't) otherwise you will have a class 15 coolant leak..[/quote]

Good info Rob- I called them up and they told me I didn't need to go with the cam kit. The Hotcam is a good cam but I'm just stuck with the big eyeballs from the 306. As far as the EGR goes I through it across one of the FT Bragg parking lots 3yrs ago. It was bad and kept blowing the pump fuze which kept throwing my SES light so out it went. As far as the plugs on the heads are you talking about the little square head bolt pattern. I guess I'll definatly be able to tell when they arrive. I hope it doesn't take to long summer is starting to make me feel the driveing blues.