z_speedfreak

iTrader: (3)

I picked up a set of stock heads a long time ago with 2.02/1.56 valves and 918 springs w/ the intention of getting them ported but I think it will be awhile longer til I have the coin for that plus the supporting mods I dont have yet. I had the heads checked out and cleaned up the other month with the intention of throwing them on as is for now. I have to do the intake gasket so figured I might as well throw them on along w/ the impala HG's I have while im in there. the next mod im planning after that is a cam in the 220*-230*/.550-.575 range, havn't narrowed down my choice just yet.. but after reading a post the other day im wondering if those valves are too big for stock heads. I have seen some people running them with stockers but I've seen people also mention valve shrouding.. are 2.02/1.56 valves to big for stock unported heads? would I see any more of a gain after I cam it with those valves + more compression or would valve shrouding cancel it out or even hurt perfomance more. so should I install them while my engine is opened up or take the springs off and put 'em back on the shelf till I have the $ to get them ported?

and anyone know when the search is going to work right again?

myltwon

iTrader: (1)

from what I hear little gains if any (some times the opposite as you mentioned) occur from the installion of large valves in a basically stock motor

z_speedfreak

iTrader: (3)

bump

ss.slp.ls1

iTrader: (36)

I'd say that you wouldn't want to go larger than 2.00"/1.56" valves on stock heads, but I'm not an expert.

96capricemgr

iTrader: (1)

2.02 is too big for the stock seat.

Bigger valves without porting is not a good idea, like putting a bigger door over the same opening, only this door stays in front of the opening even when open so yeah it would be in the way.

z_speedfreak

iTrader: (3)

yeah the machine shop that I brought them too said they weren't seating properly so he fixed that for me. still not a good idea tho huh? what about these valves w/ an LE1 p&p job? would they still be overkill?

ss.slp.ls1

iTrader: (36)

With a quality port job, that should unshroud the valves. I don't know how much work goes into a LE1 port job though.

Green3spd

iTrader: (7)

I wouldnt even install the heads until you had a cam to throw in... also, Id look into the LE1 heads and see if they would do well with those valves.. may have to step it up to a LE2...=-)

z_speedfreak

iTrader: (3)

well my next round of mods which im planning on doing before it goes back on the road will be: cam, PR's, 1.6 RR's, EWP, double roller, rebuild the 10broke & install the 3.73's I've got laying around + a re-tune. these heads have 918's on them already and I was figuring if I have to do the intake gasket I might as well go a little deeper and swap the heads and throw the imp gaskets on. but I think I'll hold off on the heads now after getting some input. I had planned on getting an LE2 p&p job but I think I have to much stuff going on to afford it this year. I could probably manage an LE1 job this spring but I'm not going to keep the car off the road till I can. and I just updated my sig w/ all my current mods so you'd guys know...lol its not very long but its a strong runner for whats done.
thanks for the feedback guys! any other thoughts?

C5042081

iTrader: (5)

I had Llyod put in 2.00/1.56 when i had my LE1 heads done, i asked him about the gains and he said gain of 8-10 RWHP/RWTQ more from 2500 RPM on up over the 1.94/1.50 valves.

I would def get the heads ported with those valves, while you have the heads off if you have the coin do the cam at that time.

something else that should be checked if you go this route is the ptv clearance
if using a stock bottom end

z_speedfreak

iTrader: (3)

^thats good to know, I should probably call up lloyd but I dont like taking up time until im ready to buy. IDK I sorta wanted to do the cam & those other mods 1st just to get some mods into it before I put it back on the road. if I did the H/C @ the same time I would have to wait longer to do any mods plus theres the wait time involved while lloyd works his magic on the heads....but maybe I should send the heads off first and get the cam later. hmmm.. whats the usual turn around time on the heads? guess I should call lloyd next time I get a chance.