2.02 vs 1.94

[Kyle]

 what are the pros and cons of each? do they perform better at certain rpm ranges? what would be better for a mild build 406 and bottom end torque?

[bigmud44]

ya cant just look @ valve size compare modern heads vortec or after market with 194 valves youl find they spank old gm heads with almighty 2.02 just do little research think youll be suprised what ya find good luck

[betterbeaters]

talk to a machine shop ask them they will have a lot better answers than us

[Disturban]

2.02 will for sure flow better but I don't think you actually gain much when just using on a stock motor with a smaller displacement like 327 or 350...when you upgrade cam and intake/fuel supply then the 2.02 will come into play and make a world of difference.

On a larger displacement motor though like a 400 I would think 2.02 heads even on a stock motor would be a very wise upgrade...if you was to compare a stock rebuild one being 2.02 heads and the other being 1.94 heads everything else being equal I don't think you would lose bottom end torque. Now when going to a huge cam that's where you will start to lose bottom end torque but way more than make up for it in higher rpm's.

[Broncoholic]

1.94's will give better low end no matter what. The cam you have will have to be matched to the trans converter gears etc. Need the velocity out the exhaust, Mid range Cam & 1.94's will give good numbers for low end.

[Jjay78]

1.94s are good for torque and can still perform well, if you just swap out stock head 1.94's for 2.02s you will actually loos airflow in some cases as per the bowl not being blended properly for the bigger valves, the bigger the valve if properly matched to the runners and chamber the more air it can flow at higher lift. but it will have lower velocity at lower rpms which will equate out to a lil softer bottem end. for a 400 it won't be as big of a deal as for a 302 or 327 or 350  though. but there are other head factors i would worry more about than valve size

[Kyle]

i got a 406 and i want to build low end torque with it. like 2k-2500 rpm range bein round the peak of it..... i wanna figure out what heads to use before i talk to comp cams and see what they reccomend for cams to use

[Mudbuster]

my recomendation is don't let comp cams choose your cam..... The make good cams but they tend to be VERY conservative with there recomendations (personal experience more than once) , instead talk to the machine shop that's gonna do you work and ask there advice....

[cnoswalt78]

any good machinest, will say if your heads a old and wore out go to big valve but if they are good and clean on a non race car, you can go to a 194.
ITS NOT A RACE CAR, itll be fine and have a but load of power  with 194 valves or smaller for that matter, torque is where its at!  big intake runners big heads big big big is for all out race cars not for torque ,pickups that need to try to keep tires spinin.
RACERS SAY 202s ARE WORTH 1HP/1MPH AT THE TOPEND OVER 194s

if its not full race then what the hell? plus 202 valve swap most people wont port it to gain any way! for instance so if you have a pennie size hole, and you cover it with a tinny bit bigger valve vers the quarter, and ported you will see more inprovements on bigger valves BUT NOT ALWAYS THE WAY YOU WANT /THINK? and just becouse dynos say alot dont always say its true, they throw dynos all the time and not one reads the same as the one across the street! just some usefull information (a famose engine builder told me) I DONT CARE! DO WHAT EVER!

[Kyle]

any good machinest, will say if your heads a old and wore out go to big valve but if they are good and clean on a non race car, you can go to a 194.
ITS NOT A RACE CAR, itll be fine and have a but load of power  with 194 valves or smaller for that matter, torque is where its at!  big intake runners big heads big big big is for all out race cars not for torque ,pickups that need to try to keep tires spinin.
RACERS SAY 202s ARE WORTH 1HP/1MPH AT THE TOPEND OVER 194s

if its not full race then what the hell? plus 202 valve swap most people wont port it to gain any way! for instance so if you have a pennie size hole, and you cover it with a tinny bit bigger valve vers the quarter, and ported you will see more inprovements on bigger valves BUT NOT ALWAYS THE WAY YOU WANT /THINK? and just becouse dynos say alot dont always say its true, they throw dynos all the time and not one reads the same as the one across the street! just some usefull information (a famose engine builder told me) I DONT CARE! DO WHAT EVER!

very good info! that was basically what i was thinking... 194s=low end, 202s=top end

[RIP_K52007]

yea i put 1.94's in the 350 im building, should be fine for low end torque and considering its going to see alot of trails and its a manual trans i need to keep the torque as low rpm as possible.. if you really want to see low end, get d cup pistons on a 6'' rod

[old school truck dude]

More flow means you'll need a bigger carb. Do that and you WILL notice quite an improvement.

[J.C.]

couldnt he put 2.02s on it and change the cam, and converter to make it have low end torque?

[old school truck dude]

Yup, mite not have to change the convertor, Id do what you said El Duderino and then try it before I pulled trans. Get the "RV" grind cam, should still idle good and prolly dont need conv... Power comes in a package, everything has to match to work correctly.

[Broncoholic]

couldnt he put 2.02s on it and change the cam, and converter to make it have low end torque?

Still need the smaller valves to increase the velocity. Unless the heads need new valve seats why bother, cut them as is. He needs small tube headers or even stock exhaust to keep it at the 1800- 2800 range. Cam selection is the key to the torque range 1.94's are good to 500 hp with a slight port job.

For an easy off the shelf deal I would use the 280 Isky mega cam. it specs 232 @ .050 and I believe .485 lift on a 108 lsa. Need something that pop's quick

Use a Edelbrock Performer not air gap or RPM manifold. stick with small 1.75 headers or smaller dia.

I have a .235 .488 & it has stump pulling power in a 351 a 406 would be even better.

[Kyle]

cam i was thinking bout using:

http://www.summitracing.com/parts/CCA-K12-235-2/

i was gonna use the weiand street fighter intake, dual plane. i have some jba short tube headers, not sure on size but they aint big. trans was already upgraded and "reprogrammed" valve body. has a 1300 or 1400 stahl converter in it

[Squirell]

my recomendation is don't let comp cams choose your cam..... The make good cams but they tend to be VERY conservative with there recomendations (personal experience more than once) , instead talk to the machine shop that's gonna do you work and ask there advice....

x2......i used there cam quest 6 and it always says use a cam that is about half what the machine shop says

[Squirell]

cam i was thinking bout using:

http://www.summitracing.com/parts/CCA-K12-235-2/

i was gonna use the weiand street fighter intake, dual plane. i have some jba short tube headers, not sure on size but they aint big. trans was already upgraded and "reprogrammed" valve body. has a 1300 or 1400 stahl converter in it

the more you let that motor breathe the better it will run

[Broncoholic]

cam i was thinking bout using:

http://www.summitracing.com/parts/CCA-K12-235-2/

i was gonna use the weiand street fighter intake, dual plane. i have some jba short tube headers, not sure on size but they aint big. trans was already upgraded and "reprogrammed" valve body. has a 1300 or 1400 stahl converter in it

That should work, Just remember at the dunes a little top end is good on the right side of test hill...  Opt for the best of both worlds. 

Your not building a rock crawler ya know 

[Kyle]

cam i was thinking bout using:

http://www.summitracing.com/parts/CCA-K12-235-2/

i was gonna use the weiand street fighter intake, dual plane. i have some jba short tube headers, not sure on size but they aint big. trans was already upgraded and "reprogrammed" valve body. has a 1300 or 1400 stahl converter in it

That should work, Just remember at the dunes a little top end is good on the right side of test hill...  Opt for the best of both worlds. 

Your not building a rock crawler ya know 

yea but the hard part is knowing what the best of both worlds are! i want to be able to have the low end torque for towing(2k-3k) and for the daily driving of it... so all i can go by is the rpm range that is given with them