Do the world s/r heads bolt right up to an 86 TPI intake?? Or will there be some modding that has to be done? It's an 86 305 TPI intake.

IIRC, the 86 still had the old style heads, and the 87 up manifolds required the centerbolt style heads.

Not to sure on what style the worlds are.

 

The Worlds are '86-earlier unless you get the ones for '87-up.

I wouldn't bother with S/R's, S/R Torquers are a step up.

 

So my 86 tpi will work with ANY 86-pre heads?

I'm going with the S/R's because I'm building a mild daily driven car. And I want to stick with the smaller 1.94 1.5 valves.

Arn't the S/R's the same as the S/R Torquers? cept they flow less because of the smaller valves? Atleast that's what my impression is. I'm not looking for 1/4 miles times or peak horsepower capability, just a decent street rodder.

 

S/R 305 Torquers have 1.94/150 valves. I don't know anything about a different S/R head.

SPECIFICATIONS
VALVES: 1.940"x1.500" Manley Street-Flo forged steel
VALVE LOCKS: 11/32" x 7° Hardened steel
VALVE SPRINGS: 1.250" Single, 1.810" Installed height
ROCKER ARM STUDS: 3/8" screw-in with hex shoulder. Not
machined for guideplates. Accepts non-hardened pushrods.
COMBUSTION CHAMBERS: 58cc volume.
INTAKE RUNNERS: 171cc volume
S/R TORQUER 305
RECOMMENDED INSTALLATION ITEMS
HEAD GASKETS: Fel-Pro #1003 or 7733PT-2 (265-350) REQUIRES
350 HEAD GASKETS. DO NOT USE STOCK 305 HEAD GASKETS.
For added performance, 305 Torquers feature revised combustion
chambers. Stock 305-bore head gaskets cannot be used.
SPARK PLUGS (gasoline): Accel 274 or 276; AC-Delco:
43TS or 44TS
INTAKE GASKETS: Fel-Pro 1204, 1256 or equivalent
EXHAUST GASKETS: Fel-Pro #1404 or equivalent
HEAD BOLTS: Manley: 42171 or equivalent
7/16" HEAD BOLT WASHERS: Manley 42102 or equivalent
rev12/99
S/R TORQUER REPLACEMENT PARTS
1.940" S/R Torquer Intake Valve (ea) ................................800000
1.500" Exhaust Valve (ea) ................................................800001
1.250" Valve Spring (ea)....................................................830000
1.440” Optional Valve Spring (ea) ....................................830007
7° 1.250" Retainer (ea)......................................................831100
10° 1.440” Retainer (ea)....................................................831102
7° Lock (ea) ......................................................................831001
10° Lock (ea) ....................................................................831004
Ring & Band ......................................................................831303
Screw-in Rocker Studs-3/8 (ea) ......................................831500
3/8" TEMP SENSOR NOTE
Temp sensor hole is 1/2" NPT. Contact your gauge manufacturer
(Auto Meter: 815-895-8141) or visit your local auto parts store for a
3/8" NPT to 1/2" NPT adapter bushing.
HEAD BOLT TORQUE SEQUENCE
Torque All Head Bolts
to 65 Ft. Lbs.
Coat all head bolt, rocker arm
stud, valve cover bolt threads,
and header bolts with Teflon®
paste for proper sealing.
TORQUE ALL ROCKER ARM STUDS TO 55 FT-LBS
FREQUENTLY ASKED QUESTIONS
S/R TORQUER FLOW NUMBERS: @ 28” H20 Unmodified:
.500" Lift: INTAKE: 213 cfm / EXHAUST: 166 cfm
.400" Lift: INTAKE: 198 cfm / EXHAUST: 156 cfm
VALVES: Stock length small block Chevy specifications
1.250" SINGLE SPRING: Maximum Lift: .560"
Installed Height: 1.810"
Pressure: 100Lbs Closed / 280 Open
1.440" DOUBLE SPRING: Maximum Lift: .600"
Installed Height: 1.810"
Pressure: 120 Lbs.
COMPRESSION: Mill roughly 10cc for each compression point.
.042" = 6.5cc
.007"/cc
MAXIMUM VALVE SPECS: 1.940" x 1.500"
MAXIMUM SPRING SEAT DEPTH: .030"
MAXIMUM SPRING DIAMETER: Use World Part# 831214 spring
locator (1.550" O.D.) with 1.440" springs.
MAXIMUM FLAT MILL: .020" Depth.
CARB EXEMPTION:
S/R Torquer cylinder heads are 50 state legal as stock replacement
parts. No E.O. number or certification stickers are applicable.

 

I guess they've stopped calling the 305 heads "S/R Torquer", and just refer to them as "S/R" now. http://www.worldcastings.com/catalog.../sbc_heads.pdf revised 2/07

They are available in both '86-earlier (042650-1) and '87-later (042750-1) style in the 305 type.

If you're talking about a 305, just go with the 042650-1's.

Just curious, why are you thinking about replacing the heads?

 

Oh sorry, I forgot to mention it's for a mild 350 build up. I was thinkin about the 43610-1 which says it will work with an 1986 engine, but I was unsure if it would work with the 86 TPI.

I wanted the S/R's over the Torquers because of the smaller valve size, and I won't be reving over 4000 rpms. They also have decent flow numbers. I would just go with some L98's remanufactured, but the heads are 150 for a pair, and local machine shop charges 385 for the pair to get redone. For that price, I think it makes sense just to go with an aftermarket head, such as the worlds plus i'm not really looking for 1/4 mile times.

The worlds are the only one that I can find with a small runner size, only 170cc which if i'm thinkin correctly is best for low end torque (TPI). And the 170cc peak at 5000rpm or so. Stockers have around 164 or so?

If you know of any heads that would be better for the price of the Worlds, you can sure let me know.

I don't want to go with vortecs though, for the extra cost of the manifold and more tuning needed. Keeping it simple.

Thanks!

 

The part number you have listed 43610-1 looks like the correct head for a pre-1987 350. Still I don't know why you would want the smaller 1.94/1.5 valves when you could get the 2.02/1.60 valves with p/n 42660-1

I'd bet that the price is the same.

 

They are the exact same price. But I read an article on this site >> https://www.thirdgen.org/mods2 that says that the larger valve size acts like larger runner size, and are used for high reving motors.

I'm not going to be revving really high, and I would like to keep the low-end torque and power. And I believe that by staying with the smaller valves I will achieve this.

The larger valves if i'm thinking right would take away from my low-end power and shift it a little higher. Defeating my purpose of this engine?

I'm not sure if that's what is meant by all of this...? Correct me if i'm wrong. I'm pretty green when it come to this.


-Tyler

 

What heads do you have laying around? (casting number)

 

What heads do I have laying around???

None at the moment, i'm currently using the 081's or 416's that are on my 305 TPI which is still running in the car, driving it every day as we speak. But they will be laying around in a few weeks, as soon as I get my motor back from the machine shop, and I figure out which heads i'm going to bolt on. Hmmm...not to sure, which ones did come on the 86 305 TPI, the 081's or the 416's?? Just wondering, cuz I came across a flow sheet on the 416's with bigger valves and they flow about the same Worlds.....and i'd be getting different pistons, to match the chambers on the heads to get the compression I want....now i'm really curious.

Hmm...

 

081's have centerbolt valve covers. 416's use the older perimeter covers. Which do you have. In my opinion you can build a better head for your 350 using either one of these castings as a start.
Home port them yourself and install new 1.94x 1.50 or 1.60" valves, drill and pin the rocker studs add new stock diameter performance springs and you'll make more power for less $$$ than a S/R head. The S/R 305 heads do not flow near as advertized by World. Measured chamber volume is not 58cc either. The only thing they have going for them is the fact that they are new and the casting quality is better than a GM head.
i have a set of the 416's all done, ready to rock on the budget 350 I'm building. Flow 232cfm@28". Chamber volume is 61cc. All finished for under $500 tax included . You can do it too.
No they are not for sale

 

Do you know if the 601's are about the same as the 416's?? I actually have a completely machined set of 601's with screw in studs, all ready to go, all i'd have to do is put in the bigger valves, I believe that they've been ported....hmmmm Would I get the same results with the 601's??

 

page 2 of thew pdf has S/R torquers right under the S/R's