are these heads any good for a bolt on application to my 305? they have 1.94/1.5 valves, 170 cc intake runners, 1.250 springs and can handle .560 lift. CR staying at 9.5:1. these are the same price as me having my stock heads machined, so i wanna know if this is a good head to put on a stock engine with a carb and cam swap. carb is gonna be a 600 CFM mechanical sec edeljunk i have lying around, cam is gonna be comp cams xtreme energy hyd roller, 218/224* @.050, .495/.502" with 1.5's gonna put in 1.6's and a 110* LSA. trying to build cheap power combo hoping for 300 HP.

I have them on my 91 RS 305 and they work great. I dunno bout gettin 300 hp out of them though. My combo is a TBI to TPI swap,zz4 cam,headers,etc.
Good for 9.30's in the 1/8th mile with a 3.08 non posi rear pushin it.

They are a decent budget head. It might be more beneficial to save more $$ and buy a set of alum. heads. For more HP alum is the way to go. Best to buy and do something once.

Aluminum heads do not make more power, but the weight you save off the front end is considered worth it, I say it sounds like a solid combo, the vortec heads are reasonably priced although you will need a intake for the different bolt pattern it has no egr provision but i have seen a 305 buildup with the vortec heads and the end result was impressive, good luck with your project.

Vortec heads have 64cc combustion chambers so on a 305 you lose some compression so wouldn't the 305 Torquers be the better choice?? Does the airflow in the Vortecs beat the compression loss you get with them that is the question?

I'm using the S/R torquers with 2.02/1.60 valves on my 350 TPI. Have to say I like them a lot! Got a lumpy cam to with it too.

You can mill down the heads. Car Craft did a 305 build a few years back and this is exactly what they did.

well at least i know they are pretty good heads. for right now i wanna build the 305 up pretty good. i'll save my money for my aluminum heads on my 383 i'll eventually build...

Think I might get a set, the price is right....

sounds like a good combo, but i'd go with a little less cam and more rear gearing...and of course a stall!

if i had a 305, tbi at that, i'd go s/r torquers first thing, hands down...

Aluminium heads dont make more power but it does allow you to run more comp which allows you to make more power and i would go with vortec heads they are a great budget head for any small block,that cam is a little big for a 305 it will sound great but it would really need a bigger stall

Why not get a decent set of used L98 alum heads? Probably cheaper and perform better, lighter, 58cc, and can be hogged out alot if you change your motor later on.

-Jim

I've run them for 5 years now on my RS and I've been very happy with them. The only gripe that I had with installing them was getting adapters for the temp sensors that go in the heads. The sensors were something like 3/8 and the threaded holes in the heads are like 1/2".

Also you need to do a little machining if you want to use the factory center bolt valve covers. Perimeter bolt valve covers work with no changes.

good combo. i'd shy away from the larger valved s/r torquer head as cylinder wall shrouding at the least or valve to bore interference at worst may result with big intake valves and small bore.

how would those heads act on a 327
also what cam would be a better cam the zz4 or the hot cam or shouold i go with sumthing from tpis??? plz help

those heads sound pretty good, I'd be careful of valve to piston clearance with that cam, which actually sounds like too much cam, you'll be wanting a new stall converter for sure

I ran this on DYNO SIM and it came out 316 hp at 5500 RPM and 373 TQ at 3500. Of course if I had the actual cam number I could be more accurate, but that's pretty close.

Anyone else out there running the SR's??????

Hey night hawk if you want the cam number here it is. Comp cams XR270HR. the intake is a weiand stealth dual plane manifold non hi-rise. let me know what kinda power it makes thanx any more info if needed let me know

Trickflow 175's are an option. A more exspensive option but they are an option.

175cc runners, flow more then vortecs. 218cfm at 0.4", 242 cfm at 0.5". 56cc chamber you you dont have to spend money milling the heads.

Yep, since 2001.

I wouldn't run them without at least pocket porting them. The casting-to-machined interface is pretty rough. I did the full do-it-yourself port and polish job on mine, how much it helped over just pocket porting I don't know. I do know that every magazine article I've seen on the heads did at least a pocket port on them before they "compared" them to stock heads.

While I was doing the porting I ground off the perimeter bolt bosses in anticipation of using '87 LB9 center bolt covers I had. However, I found the outside of the gasket rail of the covers was wider than the inside of the gasket rail of the heads. Since I had already put the engine together when I found this out, I couldn't grind the head rails so the covers would fit, and you can't grind the cover rail. So I tried putting the perimeter covers back on while I looked for another solution. That was a leak nightmare. I finally found cheapo Spectre chrome centerbolt covers fit with no problems, and they haven't leaked. I asked World why they didn't make the heads so stock covers would fit, their response was they had an early 90's truck valve cover they used for their design dimension and QC check - guess GM wasn't consistent with their cover dimensions over the years.

The biggest "issue" I had with them was after installing them on the 350 the summer of 2005. I went from 3/4" long header bolts to 1" long. When I first started it up, I had a big coolant leak from the back of the driver's side head. Seems the longer bolt pushed through the back of the bolt hole casting into the water jacket. Some JB weld stuffed in the hole and silicone sealer on the bolt threads when it was installed the last time have prevented any leaks since.

Interestingly enough, the chambers cc'd at 64cc instead of 58cc, even though they have "305" and "58cc" cast right into them. I inquired about that with World, never got a response.

I need the part number or grind number. The manifold I picked was correct to match yours. So the numbers are probably within 10 plus or minus even acounting for my choosing the Intake centerline for the cam. So, what I gave you is going to be very close to actual.

jegs part number is 249-08-422-8. thats still pretty impressive i can get 300 ponies from a 305 with bolt ons. i hope it works when i do it for real. how much was that dyno sim software you have?

Well, the part number didn't work with Comp Cams website. Anyway, it's close, the software is $250.

nighthawk, take off the first 3 #s and then run it thru the comp site. it will work then. 08-422-8

Those heads laid down some pretty good power in my old 305 based build. I had those heads with s strip dominator dual plane and a comp magnum 270H cam, roller rockers and a 750 dp and it laid down 284hp. it was stout but couldn't take much weight! soon as you added a couple of guys in the car it all went down from there lol. Great little performer though! you will like those heads for the price!

Yeah for the price they look pretty damn good......Thanks to all for the replys..Tom

Has anyone used these heads on a forced induction setup?