Green3spd

iTrader: (7)

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..

1badzee

iTrader: (12)

It's definately worth it

fergymoto

iTrader: (129)

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.

1badzee

iTrader: (12)

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

fergymoto

iTrader: (129)

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

1badzee

iTrader: (12)

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

Ls1Bait

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

Slowmaro95Z28

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.

Ls1Bait

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!!!!

robsquikz28

iTrader: (246)

do it it will help 4 sure

NightTrain66

iTrader: (7)

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

BigZee71

iTrader: (5)

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.

Green3spd

iTrader: (7)

...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?

3DFORMULA

iTrader: (4)

.Yes

koolaid_kid

iTrader: (21)

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.

Beaflag VonRathburg

iTrader: (176)

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.