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Old 10-12-2013, 04:48 PM
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World Sportsman II heads on the street?

I've got a set of ported World Sportsman II SBC heads. Intake runners are 200cc, valves are 1.94/2.08, and combustion chamber is either 64 or 72cc (we haven't cc'd them yet).


Here's the situation. These are going into a 5000 lb truck. I'm really after torque. This winter, I'm putting a cam, intake (Performer RPM), and headers on. The truck currently has 882 heads.

Some guys say the 200cc runners on these heads act like smaller runners at low rpm, is this true?

One guy told me I could run these heads with a mild cam. One of the first two cams on this page will be going in, most likely...: http://www.cranecams.com/56-67.pdf But I haven't decided which one.


So...can I get away with these heads on the street? Will gas mileage suffer? Am I better off with the 882 heads?

I'm doing this on a pretty tight budget, so new heads are out of question.


Thanks, Andy

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Old 10-12-2013, 04:52 PM
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you likely have 1.60/2.08 valves
the heads flow well when properly ported,what do they flow now?
gas mileage? is that a serious question?
you didnt say what engine the heads are going on
the heads dont care what the truck weighs
your combination should all match
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Old 10-12-2013, 04:53 PM
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I run them on the street. Run fine, plenty of torque. I think you got the valve sizes wrong.

Mine are advertised 64cc but cc'd in at 61cc , if that helps.


Duke
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Old 10-12-2013, 04:56 PM
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...........I got a cam way bigger than what your looking at, but as Vinnie says, your combination HAS to match. That's the most important thing.


Duke
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Old 10-12-2013, 04:59 PM
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BTW,welcome to the forum.Its a nice looking truck.Hope you enjoy working on it.The truck is a older than you.
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Old 10-12-2013, 05:25 PM
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Quote:
Originally Posted by vinniekq2 View Post
BTW,welcome to the forum.Its a nice looking truck.Hope you enjoy working on it.The truck is a older than you.
Thank you

Quote:
Originally Posted by vinniekq2 View Post
you likely have 1.60/2.08 valves
the heads flow well when properly ported,what do they flow now?
gas mileage? is that a serious question?
you didnt say what engine the heads are going on
the heads dont care what the truck weighs
your combination should all match
I tried my best to "eye" it with the caliper, I don't really trust myself compressing valve springs so I can measure it lol.

I really don't have the story behind these heads, I have no idea what they flow

Gas mileage is a serious question, as you probably saw I'll be driving in a year and I want to be able to afford to drive it...granted the truck already gets 13 highway mpg, but I don't want that to go down.


Engine is a mild 350 with a few mismatched parts, an RV cam and a Edelbrock Torker II intake which is single plane, whick is killing the torque..

I'm just really worried that if I put a low-rpm powerband cam and intake on it, that the heads will screw everything else up.


Edit-I'm such a loser. I got intake and exhaust valve sizes mixed up

Last edited by 71K20chevy; 10-12-2013 at 05:33 PM.
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Old 10-12-2013, 05:49 PM
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Are you staying on the street with the truck , or are you planning on hitting the mud as well ? As nice as the truck looks , and as the value climbs up in value on the `67-`72 trucks , especially 4 x 4 trucks , i`d never hit the dirt with it !! jmo
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Old 10-12-2013, 05:50 PM
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sell the torker intake and maybe consider a Holley,street dominator.dont use the heads if mileahe is a serious concern,use a smaller runner head. Headers and good exhaust and you should be able to improve gas mileage.
try and find the specs on the cam in the engine
small 4 bbl like the edelbrock 600 or w/e size the small one is,use that or a quadrajet
should spin the tires but not scare anyone and get better mileage
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Old 10-12-2013, 06:20 PM
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Are you staying on the street with the truck , or are you planning on hitting the mud as well ? As nice as the truck looks , and as the value climbs up in value on the `67-`72 trucks , especially 4 x 4 trucks , i`d never hit the dirt with it !! jmo
Thank you, street truck only, it will never see mud.

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Originally Posted by vinniekq2 View Post
sell the torker intake and maybe consider a Holley,street dominator.dont use the heads if mileahe is a serious concern,use a smaller runner head. Headers and good exhaust and you should be able to improve gas mileage.
try and find the specs on the cam in the engine
small 4 bbl like the edelbrock 600 or w/e size the small one is,use that or a quadrajet
should spin the tires but not scare anyone and get better mileage
While mileage isn't my MAIN concern, I would like to have it. The next winter adter this one, the truck probably will get a 5.3/4L60E swap so I only have to live with bad mileage for a year lol.

It's got a Q-Jet now, bogs pretty bad when the secondaries open, but I'm working on getting it tuned right.

The truck has 2" true dual exhaust...so I'm not sure how that would work, BUT, I will be investing in electric cutouts

Also...the engine makes a little noise, I'm pretty convinced it's a lifter collapsing as sometimes the truck kind of skips a beat, but it doesn't happen all the time. Definitely on the passenger side.
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Old 10-12-2013, 06:28 PM
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anything known about what the gear ratio is ? With the oversized tires on there , that will hurt you even worse if you don`t have any gear to speak of already .
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Old 10-12-2013, 06:39 PM
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I would not spend a dime other than repairs if you plan an LS swap.
seriously look for a 6 liter LS instead of the 5.3 for a truck.The truck 6 liter is common and a good engine.
I also would not get electric cutouts.
What purpose do they serve,,,,none.
The 6 liter will do ok for fuel economy compared to what you have.
drive it the way it is and use the extra money you save for the 6 liter

Last edited by vinniekq2; 10-12-2013 at 06:51 PM.
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Old 10-12-2013, 07:34 PM
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Quote:
Originally Posted by vinniekq2 View Post
I would not spend a dime other than repairs if you plan an LS swap.
seriously look for a 6 liter LS instead of the 5.3 for a truck.The truck 6 liter is common and a good engine.
I also would not get electric cutouts.
What purpose do they serve,,,,none.
The 6 liter will do ok for fuel economy compared to what you have.
drive it the way it is and use the extra money you save for the 6 liter
I've got a couple grand saved up...but I'm looking at 4k for the way I want to do the LS swap. Main reason I wanted the 5.3 was because of availability and lower junkyard price.

The thing is, I sometimes race my truck on a 300 ft drag strip....and to be honest, I'm the slowest vehicle there. Then again, there might be a noticeable power difference with the stock dual plane intake.
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Old 10-12-2013, 07:43 PM
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I know the 6 liter costs more,thats why I said ditch the electric cutouts and dont spend money on the gen 1 anything. If you "race" 300 foot races,change the transfer case to a 3:1 reduction
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Old 10-12-2013, 07:54 PM
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Sportsman heads would work fine for the year. I have them on my truck. Granted, it's a lot smaller than yours (1950 chevy 3100) and weighs 3400 with me and gas, but it'll move nicely. I run a lunati single pattern cam, 225@.050", .477" lift, 108lsa. It's pretty torquey, pulls 15 in.Hg at idle. I'd run something smaller unless you have 3.73's or better. I run a 3.27 but on a 26" tire, moves fine. Smaller cams in the 210-220@.050 would work fine I'd think. I use the Edelbrock Performer Rpm intake and a 680vs QuickFuel. I'd opt for the rpm over the performer or torker intake, it flows well. The combo wouldn't be ideal, but keeping the cam smaller woul be a good driver for a year.

Lunati 10120101: 214,224@.050", .443/.465, 112lsa.

I'd think something along those lines would be fine, probably the upper end of the scale. If you can get away with bumping your compression up a little id try I with a thinner head gasket.
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Old 10-17-2013, 09:19 AM
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Awesome, might try it then. Thanks guys!
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