Valve Spring s

[nick161999]

I have a stock 305 out of a 1982 chevy caprice classic. The engine was always well looked after and only has 130k kms on it. I was recently having backfiring issues (and still am) when the car went up in rpms. Turns out 3 of the lobes on my camshaft are almost completely wiped out. I have a Lunati camshaft here with under 1000kms on it. The duration is 207/213, the lift is .437/.454 and a separation angle of 112/108. It is just a mild cam. I am wondering if I need to upgrade the valve springs for the new cam. Heads up, my 305 is factory rated at 145hp if anyone searches it up, 418 heads.

 

[lilbowtie]

You need to run the recommended spring rates for the cam you are installing. Do you have the lifters for the cam you want to run - also proper run-in. If your just throwing a cam in to get running again go for it - I'm sure the 305 springs are weaker than needed.

 

[axisg]

** disclaimer ** we all know the proper thing to do is to pull the motor apart as the metal ground off the lobes is now circulating your engine block, bearing surfaces and left deposits in all the nooks and crannies.

However I have swapped quite a few 305 camshafts in the late 80's and early 90's when this was a common problem. But its going to take some work. Unless a motor swap is completely out of the question now would be a good time to upgrade to something with a few more cubes ( and may be cheaper than fixing what you have )
http://www.kijiji.ca/v-engines-and-...ds/1223962376?enableSearchNavigationFlag=true
** cough ( motorheadmike ) cough **

Also you should be using an ZZP additive in your oil

 

[nick161999]

It will all be getting broken in again. The cam comes with lifters. The lifters are broken in on the camshaft by a different person. I just need the car to run reliably for now. If my stock springs are good for now, then that would be great.

 

[pontiacgp]

I hope each of those lifters are marked for the exhaust and intake side and the cylinder number they came from

 

[nick161999]

Yes, the lifters are all marked for where they came from

 

[axisg]

what was the recommendation on springs from the camshaft manufacturer ? Any time we would do a 305 cam swap it would at least include new springs, valve guide seals, timing chain and a mild RV cam.

 

[motorheadmike]

** disclaimer ** we all know the proper thing to do is to pull the motor apart and the metal ground off the lobes is now circulating your engine block, bearing surfaces and left deposits in all the nooks and crannies.

However I have swapped quite a few 305 camshafts in the late 80's and early 90's when this was a common problem. But its going to take some work. Unless a motor swap is completely out of the question now would be a good time to upgrade to something with a few more cubes ( and may be cheaper than fixing what you have )
http://www.kijiji.ca/v-engines-and-...ds/1223962376?enableSearchNavigationFlag=true
** cough ( motorheadmike ) cough **

Also you should be using an ZZP additive in your oil

Well he better hurry up... someone is (allegedly) coming by the house tomorrow to look at it.

 

[motorheadmike]

Yes, you need springs OP.

Look up the cam on Lunati's website, find the cam kit number, pull the number for the included springs, call Summit and order them... wait and install.

 

[nick161999]

I plan on keeping my 305 block for a future build. If I replace the engine now, it will only be to get some cheap small block temporarily. Yes I know, a 350 has more cubes, but building a 305 will make the engine my own, and still be numbers matching. I will look into getting some springs for it shortly. Any chance of occasional driving with the stock springs until the new ones come in? I really need a vehicle so I can actually get to work. I live out of town.