am a newbie here,could use a little help.Recently bought a motor to replace my motor same engine,the difference here is that the motor i bought does not have a stock cam it is a lt4 hot cam now after diong the swap the motor does not want to run correctly[maybe15seconds]very rough idle if you wish to call it that[motor is a 305 5.0 vortec with stock heads]timing is set correctly tdc,have spark and fuel about 60psi my concern is this motor will never run with this cam,now summit racing tells me that that motor will never run,for a lot of reasons they said it was a mess,the guy i bought the motor off,did not change the cam gear set first of all ,asked if buying that set would make a difference they said no,he did say my question had sparked a debate in the tech department the tech department putting there heads together but between them they agree motor will never run,they said if i carbed the motor it would run great but thats a ton of money,drawing unemployment,any answers out there the kid i bought it from said that this is where he got the info before he swapped cams,need help,even asked if a new ecm would have it running guys at summit say no,ANY HELP HERE WOULD BE APPRIECIATED.

 

First of all, use punctuation. After reading it 4 times, I have arrived to the conclusion that this probably has to do with this thread:

https://www.thirdgen.org/forums/tech...need-some.html

I think that's pretty funny. 2 people arguing point-counter point, on the same forums.

Bottom line: LT4 hotcam was designed for the LTx engine platform, which has 45 more cubes. An aggressively tuned prom chip would have the motor running adequately.

 

This is funny but cut and dry this combo will never work lt4 hot cam has to much lift for the stock vortec heads,roughly the max lift here is .470 for vortec heads. lt4 cam alone has to much lift let alone the lt4 hot cam wich has a even higher lift so there really is no argument here from my side just a stubborn kid who is pissed his application will not work.Yes i figured i would have to flash or get another pcm,but of course i want to hear the motor run before i do this,usually a shot of starting fluid will accomplish this.Now with that being said the kid does not even no what zero lash was,of course we learn this after putting the motor in the van where you have no room to work,his statement when i bought this motor was,plugs,wires,dist,and go hardly,try to fire the motor but have absolutly no compression so we pull a plug and check compression 0 would not move the gauge,so we pull the valve covers and find the kid had cranked rocker arms as tight as he could get them ,so we backed them off to 0 lash and of course at that point we had decent compression checked cylinder1 had 140psi.Go to fire of course no start,this is with timing set at tdc,so after the joke with the rocker arms,pulled timing chian cover off to make sure timing was set correctly,it was but at this point we notice he did not buy the cam gear set which we could not believe.So to make the story a little shorter at this point a called summit racing tech department you know the guys you can call to double check compatibility before you buy,and Mack over there said the application with that set up would never work.So i email champ back tell him this set up wont work he says b.s and tells me how he built his s10 and knows what he is doing?,I make him a great offer that i would pull the wrong cam out give it back to him along with the other 2 cams he threw in and that he could sell them on e-bay or wherever,and split the right cam for this motor with me, he says no way basically and that the problem lies with me,you go sell the cams he says and continues to tell me we doint know what we are doing,now i.AN really dont want to take the guy to court on this which i would have a case,will not run with stock heads,but trying to be reasonable.can someone talks some since into this boy,lol

 

trying to talk sense into anyone is a lost cause before you even start, so let's consider a few things. 1) those heads can be modified to accept that cam, but you have to be stupid beyond words to put such an engine combo into any van. If those L30 heads are not the swirl-port version (yes, they do exist, I've see them) and were modified to accept .492" for that cam (with 1.5:1 rockers) that would be a fine engine combo for a Fiero or RX7 or such. At this point, aside from the lift-clearance issues, all that's needed is either a cam change or a custom tune on a chassis dyno.

 

well at this point i just wanted verification for what i already know,that set up as it is would not work,my plan is to get the right cam for the motor trying to get the kid to respond that for 1, he is wrong 2, split the proper cam with me that is more than reasonable i am doing the work,and giving him all three cams back to sell ,after all it was billed as plugs,wires ,dist and go ,which is not the case

 

This all along was to replace the same motor,my cam was wiped,so i was looking for a cam when i ran accross this motor for $450.00,upper half all new so i figured why not ,for a little more, upper half all new,and now this, it would be very fair for him to split that cam with me,and we can part ways happy.

 

Anybody know where i can get this cam at a good price[cs1573]best i could find is $200.00

 

$200 is fair for a hydraulic roller, the RamJet350 cam is going for around $150 and would work fairly well for you.

 

heres the last post from the kid lol

Im glad a guy that gets paid to look up part #'s on the phone at Summit knows everything in the real world, lol. Each rocker was set exactly how the manual I read said. "turn the engine over and watch the exhaust rocker arm. When it opens roughly a third of its total, stop and set the intake rocker arm. Then tighten the nut until all clearance is eliminated, and then tighten the adjuster another half-turn to set preload. Continue to bump the engine past max intake valve lift and stop when the intake is about halfway down on the closing side. Now set the exhaust valve." Whats so hard about that? Maybe they were hard to get off because of the loctite I used. I didn't know of any bolts snapped off, I used a new set of GMperformance head bolts, and the cam gear set is new and we went over this already.

Not as advertised? Im getting tired of hearing this. I gave you all the information the best of my knowledge and what it should need to get it to run. I tried to help as much as I can, which is more than enough since you bought a used engine. I can't sit back and babysit you on what you should be doing still, and just because you bought something that you can't make work for your application doesn't mean that I'm to blame.

I tried to be reasonable but you keep coming up with stuff to blame on me so Im done with this.

- yourmominabox
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