I plan on going with a stock bottom end(rod bolts, main girdle, main studs), with CC306, ported Stock heads and Ported stock Intake manifold...

Would it be worth it to install 2.02/1.60 valves? I know it would benefit from it but would it actually be worth the money to have my heads machined and the whole 9 yards...?

And to go ahead and get this out of the way... Im not buying aftermarket heads... budget build..

 

It's definately worth it

 

May not be worth it. You will have to go to bigger intake seats I know for a fact, I *think* the exhaust seats will take a 1.600 valve but can't remember for sure. Some of the best LT1 heads out there use 2.00 and 1.560 valves and these work on stock seats.

 

So it's not worth the $150 to machine the head and seat larger valves?

 

If it were you would be seeing it done more don't you think??

 

I see it done all the time down here in sofla lol

 

Its done quite often on stock heads. I was thinking about it on my heads but I spent the money on porting instead, so when I build a forged 355 I will have it done

 

I'm doing a similar setup and my engine builder said basically that it is not worth the money for the tiny gains if any you will see. After the long explanation I see what he means. If you have the money to blow see what happens but for a budget build forget it.

 

Yea I would have to agree if ya got the money why not but a set of AFR's would be much better spent on!!!!

 

do it it will help 4 sure

 

The stock valve setas are only 2.00/1.56 so if you machine the seats as large as possible, a 2.00/1.56 valve fits perfect.

If you use a 2.02/1.60 valve, you are just placing a larger valve in front of the seat and same size hole so the air has to go around more valve diameter before entering/exiting the cylinder. You will lose flow and HP over a 2.00/1.56 valve.

Lloyd

 

Why not spend the money on a 3 or 5 angle valve job or SS swirl polished valves? Or better yet some valve terrain upgrades.

 

...Ya.. I planned on that too, lol..

so you I should think about doing 2.00/1.56 valves instead?

Ive never bothered a set of heads.. what would it take to install 2.00/1.56?

 

.Yes

 

I suggest speaking to Bryan at portandpolishing.com before doing this.
Good work good prices, etc. A second/third opinion never hurt, and he did right by me.
JMHO.

 

The best thing you could do is get a set of stock LS1 valves (2.00 / 1.55) and have the guides switched out. Having the guides switched should cost about $150. You can get a set of LS1 valves for about $30-50. Then, add the $150 = $180-200. That's less than you'd spend on a set of 11/32 aftermarket valves. You'll have a larger valve than stock, thinner stem diameter that'll flow more air, and do it on a budget.

You also either have valve springs or will need a set. You can order a set of Patriot Golds (LS1 ones) for $250 and be set.