did a search but got conflicting answers. I descided it is time to upgrade the cam in my 305 tbi but unsure what to get I know the lt-1 cam would work but I think it would still be to small I want something with a lope at Idle but still be drivable will the zz4 cam do this for me and will it work with factory heads with the lift I know the heads might limit it and it will need tuning but it is something I'm willing to do

 

the lt1 seems to be a very good cam for the TBI cars.

the problem you are going to have with a 'lopey' cam, is that will be mismatched with the compenents you have. also the 'lopeir' the the cam, the more trouble the computer is going to have. (i assume by lopy you mean big duration, and more overlap?)

now you could probably get away with a bigger cam if you changed heads, and changed the intake. a cam that fits well with those mods is going to be much larger than a good matched cam for the stock components.

but with the swirl port heads, and crapy stock intake, the LT1 is probably about as big as i would want to go. otherwise the powerband will move up to a point where the factory parts just can't operate efficently.

 

sorry didn't mention that car already has edelbrock performer intake and 1 5/8" shorty headers I guess my main concern is if the zz4 cam would work with the factory heads or if the guides need to be machined I will still use the 1.5 rocker arms and if tuning becomes an issue I will through a card on it

 

what are the specs on a zz4 cam.

my thought is that if you are going to go through the $$ and trouble to machine the heads, don't bother with the boat anchors on teh car, at least get 305 TPI heads for it.

how much you have to do depends on lift. do you have the lift specs on the zz4 cam? if it is about .480 you will need the valve guids, and possible the holes for the pushrods elongated.

late modle heads don't sue guideplates, they have self aligning rockers.

also for higher lift the press in studs just wont cut it (just had a friend pull 3 studs at .47 lift) so you will need screw in studs.

also on a 305, i would stay at the max in the 210-214 intake range, and 216-220 range for exaust. any bigger and it will just be too much cam, and even those numbers i gave you are on the large size, if you have an auto, for a cam like that, you would probably want to run a higher stall converter, and have at least 3.42s.

another thing to consider, is that with a computer, you probably don't want to go lower than a 112 LSA.

 

the specs are duration @ .050" 208/220 lift .474"/.510" lobe sep 112 if it will be more than a cam swap then I will just go with the lt-1 cam I just wanted something with a good sound at Idle

 

depending on the rest of the car that should be an ok cam, with diffrent heads.

i am (in the progress) of running a 210/218 .492 .492 112 cam with a wieand single plane intake, and ported 416 heads.

that should make my powerband between 3500-6000. so you need to figure out where you want your powerband.

and to run that cam, i am doing screw in studs, new valve springs, new pushrods, having the guids machined, ect, ect. to run a cam that large, it is not a plug and play venture. and i fully expect my computer to freak out with that cam, i foresee lots of tuning to get it to run to its potential.