vansrider98

What aftermarket heads can I use for my 92 rs with a 305 tbi?

ShiftyCapone

iTrader: (7)

There are numerous ways to go depending on chamber size, EGR compatability, flow rates, valve size ETC. It depends on what your set-up is and what you want out of it. Ported 305 TPI heads are popular and so are SR torquer 305's. Try a search and you will come up will enough info to keep you reading all night.

johnjm22

Are the sr torquer heads a direct bolt on replacement? Will they except all the egr stuff?

What I basically mean is; If I buy the pre assembled sr torquer 305's, all I have to do is bolt the thing on right? No mods required, and still smog legal.

ShiftyCapone

iTrader: (7)

You are correct. The SR Torquers and 305TPI heads are about the only teu bolt on and forget heads. They have the same style EGR as stock and you can use your origonal intake. By the way there are TPI and SR heads for pre and post 1987 so make sure you get the right ones.

johnjm22

That makes me feel alot better!!!!!!!!

vansrider98

Do the SR Torquer heads have a website?

vjo90RS8

iTrader: (1)

www.worldcastings.com

vansrider98

Ok so I get the sr torquer 305 heads correct? But what should I get? I want to use just all of the stuff that comes off my car. So, I guess I should just get the bare head right. Or can I get the hydraulic or hydraulic roller?-will those still be smog legal for my car?

vansrider98

anybody have a price on these heads?

ShiftyCapone

iTrader: (7)

What year is your car. If it 1987 or later you want to get the 87 and up and vice versa if your car is older. I would not get the bare head. You can buy them fully assembled right out of jegs with manley valves and everything. The springs and heads are ready to take over .5XX something liftand are ready to be bolted on. This would save you some time and energy than buying everything separate. Oh and it you buy the 1987 and later ones they are set up for a hydraulic roller set-up and the pre 1987 ones are not. The only thing you can use off of your car is the rocker arms. The other stuff is old and worn out and you do not want to re0use it. Frankly I would not even re use the stock rockers. They flex way to much.

azvolfan

I went with the TPI heads and I am very please with them. Direct bolt on. Casting number 416 for pre-87 perimeter bolt valve cover and casting 081 for 87 and newer centerbolt valve cover. You can usually pick up a set of these for under $100.

johnjm22

The fully assembled sr torquer heads are pretty cheap too. I think they are only like $379 from jegs. And even cheaper bare.

ShiftyCapone

iTrader: (7)

That is per head though. A set will cost you a bit over 700.

seanof30306

iTrader: (4)

not entirely correct. go to worldcastings.com and look s/r torquer 305's up in the tech section. here's what you have to do to make the heads egr compatible:

"Emissions:
To activate for emissions, the cylinder head will need to be disassembled, then you will need a 6 inch long, ¼ diameter drill bit to drill through the heat crossover passage
(found in the center of the intake flange) to the exhaust bowl. When the exhaust crossover passage is drilled, this activates EGR operation making this head 50 State
emission legal under E.O. # D-343-1. Then the included exemption sticker MUST be by law be placed next to your vehicle’s emission sticker."


i recently picked up a set of bare s/r torquer 305s off of ebay. getting ready to have them ported and polished. if you're interested, world products offers porting services at pretty reasonable proces. call arthur at world products.

ShiftyCapone

iTrader: (7)

Wow I did not know this. I have always read that they were one of the only true bolt ons for our cars and nothing had to be done to them to work. Even in the 305 buildup in superchevy they didn't mention that and I have never heard of any board member who has those heads do that. Hmmm.... I too was about to purchase these heads unitl I wrecked it and never came across this as being something you had to do. -me scratching head

Axoid

When I installed mine last winter I just bolted them on and didn't mess with this. The only or other trick that I found was that the temp sensors that screw into the heads had 3/8" threads. The points in the heads were pre-taped for 1/2" so I had to use redusers.

The tech doc on world's web site may be out of date, because it said the temp ports would be 3/8" and could be drilled and taped up to 1/2". Mine came as 1/2".

johnjm22

Axoid, how much of a noticable gain was there after you bolted on the heads? Have you taken your vehicle through smog since? How difficult were the heads to install? And what did you have to do as far as tuning after installing the new heads?

Axoid

It is had to tell what the heads gained me because I replace the cam and intake at the same time, but I went from 175 rwhp to 213 rwhp. I used head studs and had to remove a couple on the passenger side to get the head inplace aroung the AC air box. If I had used standard bolts the heads just bolted on with no problems. We have no smog testing here so I cann't say if it would pass or not. I had to do a good bit of tuning on the prom because of everything that I changed.

seanof30306

iTrader: (4)

looks like you guys are right. i looked at the heads, the holes for the egr are there.

ShiftyCapone

iTrader: (7)

Thats what I thought. You had me confused there for a minute.