What would happen if you had a cam let's say it's at 415. In and 430.ex and your heads max lift was 475.

Would the valves open properly?

 

If you mean "free of mechanical interference up to" .475", then yes. The valves have room to go a bit farther yet, before they crash into anything.

Sounds like a stock Vortec cam and Vortec heads for example.

 

Or a stock TPI or just about any of the factory GM roller cams.

The GM Ramjet crate engine runs 0.481" lift on the exhaust side on stock vortecs. I have checked several stock Vortec heads and found the examples I have had would not interfere until 0.510" lift. Deduct the typical .050" safety margin and you get the 0.460" most places quote. Running with 0.030" to spare has not been a problem in 3 different L31s for me.

 

just making sure because i want to do a head and cam swap but i think new heads and that intake to work with them would be good for right now until i can get the money for the cam and lifters

 

I ran a cam with 465 lift on stock vortecs and had no trouble. My uncle has ran them with 480 lift cams many times no trouble but I wouldn't recommend taking chance over 465. Gm claims 475 lift max.

 

Is it okay if i ask what cam it was, i just want to be safe because this is what i had in mind https://www.summitracing.com/parts/c...62-4/overview/

 

GM Ramjet crate engine runs .460/.481" lift on stock springs. The 357hp SPO 350 crate engine runs .474/.474 lift on stock heads.

 

My stock heads are running .525/.535 on factory springs.

Be VERY careful about using terms like "stock" or "factory" or "original equipment" since there are large variations within those terms.

Always measure. Always set up. And always check clearances.

 

I am taking extra precautions with my engine so im triple checking everything, if im gonna do this im gonna do it right the first time.

 

With that attitude, you'll have a very good chance of a successful build. With a cam LIKE the one in your link above you will be in a safe range, but double-checking everything will be necessary as you know.

Importantly, I specifically mentioned a cam LIKE the one in your link because that one is a flat tappet cam/lifter set. If this is going into the '91 in your signature, you'll almost certainly want a roller cam and lifter set to replace the stock rollers. Even if this is for an older block, upgrading to aftermarket rollers (loose link or otherwise) is highly recommended.

 

i have been looking at rollers but they just get so darn pricey and i cant find one thats close to these specs, i have been thinking about just getting a new short block and building that up and just waiting for my old motor to kick the bucket then swap it.

But yeah i have a rebuild kit from pro built automatics that handles 675+hp a new stall for it to handle all that the first chunk of change is to make my car pretty again, clear up some surface rust and get panels aligned.




Plans for the motor
https://www.summitracing.com/parts/nal-12558060
https://www.summitracing.com/parts/c...62-4/overview/ or a roller if i can find one like it
https://www.summitracing.com/parts/e...e030/overview/ to make a good compression for boost, im going by what it says. (quoted What is the estimated compression ratio stock deck height with 64cc cylinder heads then it says 9.0:1 with 40. head gasket)
Then the procharger when i have the money for it



Just found a cam right on the money http://www.lunatipower.com/Product.aspx?id=1999&gid=291

 

Id definitely stay with a roller cam setup. You can get an Alex Spring kit around $100 to get you more lift on those heads and go with a GM LT4 hotcam or something of that nature if you wanted. Roller cams don't wear bad usually you can use your old roller lifters if they look good upon inspection. I bought a used 40k mile roller cam I plan to use on my next build myself. It looks brand new and I bought it cheap.

 

Okay

 

I’m not sure where you are located and if you are emissions exempt. I have tuned the hot cam with vortec heads for a member in ca and it passes testing. I’m assuming your keeping efi. You might want to figure out your drive ability issue before you pull the trigger on a new engine.

 

Yeah i know im working on them, i just like to have a list of all the things i want to do and do them in steps