Well I posted a topic about heads for a 305 tpi and Someone on he fourm recomended World Products SB-Chevy S/R Torquer Heads. Does any one know about these heads and the hp gains? Because I found them for 400$ each on jegs so I am probebly going to buy them.

 

Out of the box, they will make NO more power than your stock 081 heads.

 

The S/R Torquers may make a touch more power, but not the regular S/Rs. BTW, S/R = Stock Replacement.

 

you'd be much better off going to vortecs. For $800 beans you can have MUCH better. 305 aftermarket on heads is kinda limited due to bore interference w/ the valves most aftermarket sbc performance heads. - Biggest thing to look for is to stay at/under 1.94/1.50 valves. -
- and yes, your factory heads are pretty even w/ the torquers. - Ever thought of doing some port work yourself? Save ya a bunch of money and make good power.

 

I'm running stock ported heads

 

how much porting??? bowls, runners, guides...?

 

In the magazine Camaro Performers (Summer 2001) the magazine tested a set of World Products 305 torquers. The engine, a stock 305 that's been .030 over-bore. They used a set of stock 305 heads P/N 14014416 1.84 intake, 1.50 exhaust. the engine made 215 hp and 274 lb-ft. The 305 Torquers out of the box 1.94 intake, 1.50 exhaust and 58cc chambers with 171cc runners made 51 hp increase. No other mods. 266hp and 337lb-ft were the results.

 

I have the S/R Torquers on my 350 and they make good power and worked with the stock TPI bolt pattern. Vortec heads make more power but need a different intake and will eliminate EGR.

 

I am installing those same S/R heads on my car now. The 1.94 intake valves are the way to go with a 305. The S/R's do flow more out of the box than your stock heads, but they will still benefit from some gasket matching & porting on the exhaust. The intake ports are fine already.

Regardless, you will need a better set of exhaust pipes, and probably a little more fuel. This means at least a good Y-pipe w/gasket matched manifolds, or some headers, 2 3/4" or 3" I pipe, high flow cat, high flow muffler, & an AFPR set to 46/47 psi. With those changes alone I'd guess you will see a 40+ HP gain.

Maybe it's a good time to add a new cam too.... it's more work... and then you will also need to burn a new PROM to get it tuned right. And then, why not go to 22 lb. fuel injectors as well.....

300+ HP is there for the taking, it's just time, effort, and money.

 

People around here have a skewed opinion on the performance of the stock 305 heads.... The S/R Torquers outflow the stock heads significantly.


CHP did a similar test to the one mentioned above on a 305, w/ the stock heads, aftermarket intake/carb, long tube headers and a decent cam (218/224) it made 269hp. With the S/R Torquers swapped on it made right at 300hp. With Vortecs (milled I believe to retain compression) it was up near 325 hp.

I don't think they're worth the $700-$800 but they kill the stockers. I'd go w/ the Vortecs personally. Even if you manage to port the 305 heads to flow decently, they still have a lackluster outdated combustion chamber design. Plus half the guys home porting their heads for the first couple times will have pretty lackluster results. And most of the guys signing the praises of ported 305 heads have no dyno or track times to really back up the claimed flow numbers... There's more to a head than just raw flow numbers...

 

The Vortecs seem to be a better way to go for performance... IF you don't have Cailfornia or similar smog regulations to deal with.

The fact is that re-working a set of stock heads to the point that they will deal with a cam lift of ~.480+ will cost about the same as buying a new set of S/R's. So why not just go for the new S/R'S since it's a better flowing head anyway?