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Old 06-18-2012, 04:58 PM
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2.05 or 2.02 valves?

The reason i'm asking is because I've got the option to go either way right now. I'm running a set of world S/R torquer heads, but I've only got ONE head. I'm buying a new head to match, because the other head was destroyed. However the machine shop informed me that my current head is fitted with 2.05 intake valves, and standard size (1.60) exhaust valves. There won't be a price difference to either stick with the 2.05's and have the new head fitted, or go with 2.02's and refit the old head with the smaller valves.

Engine specs
SBC 350 no overbore or stroke, just a plain jane 350 with a solid bottom end, stock configuration pistons.
World S/R torquer heads
170cc Intake Ports
67cc Combustion Chambers

CompCams XTREME Energy™ Hydraulic Flat Tappet Cam
Range from 1300 to 5600
duration 262/270
advertised lift 462/469

Here's a link to the cam card specs if anybody is interested
http://www.compcams.com/Company/CC/c...x?csid=85&sb=2

I picked up the cam kit and it came with the entire valvetrain except valves.

The rockers are roller rockers with the standard 1.52 ratio.

As for ignition/ fuel delivery I've got a nice mallory street HEI, no box.
I've got a few carbs and I'm not sure which one i'm going to use. I've got a holley 600 i rebuilt, a 650, a 750 DP, and a few Qjets all of them are either 750's or 850 CFMs.

I rebuild Qjets and run them on just about everything so I've got a few options there. The intake will depend on what carb i use. I've got a few old holley/edelbrock aluminium ones i picked up for cheap, used. Some are spread bore, some are square. I'll go with whichever will work best with this setup.

Thanks for taking the time to read this yall, i figured i'd be able to get some straight forward advice on here for squeezing as much out of this 350 as i can.

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Old 06-18-2012, 05:20 PM
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I'd use the 2.02's.
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Old 06-18-2012, 05:33 PM
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1.21 giga-watts???!!!!
 
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Second that, the 2.05 would be a total waste. Actually, I'd go with the 1.94 intakes with that setup.
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Old 06-18-2012, 05:37 PM
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Yeah i was leaning towards the 2.02's, i feel like they would give me more response and mid range power. The 1.94's aren't an option.

I guess i forgot to mention if you couldn't tell this is a street engine, performance minded but i'd like to keep her drivable daily for the summer. This engine is temporary anyways, i'm using what I've got to put it togethor. I'm also building an oldsmobile 403, and it will turn heads
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Old 06-18-2012, 05:44 PM
How fast is fast enough?
 
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Refitting with smaller valves is not easy if the bigger set was properly installed. To save money I would match what you already have. For that runner size a 1.94" would be more than adequate though.
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Old 06-18-2012, 08:54 PM
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1.21 giga-watts???!!!!
 
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Old 06-19-2012, 09:18 AM
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No to steal or sound stupid..but wouldn't the 1.94 valves give better response and bottom e d grunt...and wake that little motor up better than the 2.02 or so on..I know they aren't a option just curious
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Old 06-19-2012, 09:28 AM
How fast is fast enough?
 
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Quote:
Originally Posted by kennyhammond
No to steal or sound stupid..but wouldn't the 1.94 valves give better response and bottom e d grunt...and wake that little motor up better than the 2.02 or so on..I know they aren't a option just curious
yes. for that port size 1.94" valves are more than adequate and more valve will cost you power. that assumes a good valve job and bowl/chamber.
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Old 06-20-2012, 09:55 AM
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I would like to fit the 1.94's but thats added cost because i'd have to have both heads refitted then. At least right now one of my heads will be 2.02.
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Old 06-20-2012, 01:04 PM
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2.02/vs 2.05

with 170 cc runners just match the existing 2.05 valve.Get a head porter to match both castings for flow.Spend a little money and make sure the exhaust flow is 75 to 80% of the intakes.If more throttle response is needed then experiment with carb spacers and venturis in the carb.Get the carb modified for adjustable airbleeds,then you will see a nice little improvement in power and great improvement in driveability
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Old 06-20-2012, 01:16 PM
How fast is fast enough?
 
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Quote:
Originally Posted by vinniekq2
with 170 cc runners just match the existing 2.05 valve.Get a head porter to match both castings for flow.Spend a little money and make sure the exhaust flow is 75 to 80% of the intakes.If more throttle response is needed then experiment with carb spacers and venturis in the carb.Get the carb modified for adjustable airbleeds,then you will see a nice little improvement in power and great improvement in driveability
Let's triple the budget for fun! Do you work for the federal government?
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Old 06-20-2012, 01:28 PM
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Sell the one good head and buy a new pair of entry level hi perf aluminum heads.
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Old 06-20-2012, 01:31 PM
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The intake valve should be half the bore. 4" bore gets a 2" valve, any more and velocity suffers.

The xe262 and xe268 are great cams for making power.The 268 was a little soft on the low end. Doggy almost probable need a higher stall, or maybe conpression. No experience with the xe262

How would adjustable idle air bleeds increase performance/acceleration . Makes no sense, the stock idle feed works just fine. 4 corner are not nesscary at the level i have ever played.

My 1st 70 cuda in the 80's had a 440/727tf with 509 mp cam 906 heads 3600stall 4.11 26"tire. Ran a 13 flat. So i ask what did i do wrong...
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Old 06-20-2012, 01:48 PM
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re 440 running 13s?

you can answer that question yourself,lol.

re 2.05 valves in a head with 170 cc intake runners and 106 degree LSA,the 2.05 valve will work just fine.
re air bleed circuits being adjustable,put the car on a chasis dyno and check the a/f mixtures under load.your carb may be fine,though not likely perfect.Fuel injected cars go faster even with less HP,usually because the mixtures are closer to perfect through the entire RPM range.
yes air bleeds help.If cost is the biggest issue then dont bother.
The car is a lot more fun to drive if it runs great compared to the guy that has 100 more hp and is always fouling plugs,runs rough because the cam is too big.Take what you have and tune it as best you can afford and drive the car.
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Old 06-20-2012, 01:55 PM
How fast is fast enough?
 
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Quote:
Originally Posted by vinniekq2
you can answer that question yourself,lol.

re 2.05 valves in a head with 170 cc intake runners and 106 degree LSA,the 2.05 valve will work just fine.
re air bleed circuits being adjustable,put the car on a chasis dyno and check the a/f mixtures under load.your carb may be fine,though not likely perfect.Fuel injected cars go faster even with less HP,usually because the mixtures are closer to perfect through the entire RPM range.
yes air bleeds help.If cost is the biggest issue then dont bother.
The car is a lot more fun to drive if it runs great compared to the guy that has 100 more hp and is always fouling plugs,runs rough because the cam is too big.Take what you have and tune it as best you can afford and drive the car.
So a 106lsa will make the 2.05" valve perform better?
Cars go faster with less power because of what exactly?
Air bleeds can be adjusted for the cost of a brass set screw?
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