skinny z

Does anyone have these heads?
I have to invest in either rebuilding my Vortecs or stepping up.
The 12410 RHS heads look interesting.

305sbc

iTrader: (3)

I have yet to see any in person.
RHS has a good rep though.
Do they tell you the min CSA for them?
That would be a good way to compare to your Vortecs as far as port velocity and RPM capability.

skinny z

Published flow data can be so misleading I'm not sure what to think with what I've read.
The most thorough informaton I've come across is from Stan Weiss.
http://users.erols.com/srweiss/tablehdc.htm
References to port vcelocity (port velocity is noted on some of the tested heads) are difficult to interperate as some heads are measured on different equipment than others (as stated in the link attached).
Still the RHS seem to have superior numbers to the vortecs at all ranges.

z 28 jari

iTrader: (1)

If I remember correctly those RHS heads published flow numbers were at 4.2" bore.

3rdgenmaro

iTrader: (9)

From what I have read, the RHS heads can be ported more then stock heads due to thicker castings. For the price of the RHS heads they are hard to beat compared to full machining of stock heads. Then you also have to think about spending a little more and getting a set of AFR's vortec heads.

I will be going through the same thought process in a couple of years.

skinny z

There are two sets of flow data for the Pro Torker on Weiss' database. 4.2" and 4.155".
I'll be calling the RHS tech line and try to get some direct info from them.

That just about sums it up. I can drop another $600 plus for new guides and a valve job on my already modified Vortecs (screw-in studs, guide plates, push rod holes clearenced for 1.6 rockers, Beehive springs) OR for about $250 more, I can get brand new SUPERIOR heads ready to go and still have a set of servicable heads on my parts shelf.
As for the AFRs, if they made them with a 180cc port (Vortec), I'd be interested. I've only seen the 190cc offerings.
I'm trying to keep the port size to a minimum while still achieving my hp/torque goals. As the ports increase in size, low lift flow diminishes. I firmly believe that my combination has overachieved as it has directly as a result of the Vortecs and their excellent low to mid lift flow numbers.

305sbc

iTrader: (3)

I'm not an AFR head pusher at all, but you should contact them and ask for the minimum CSA on their 190cc head you were looking at.
You might be surprised in how close it could be to what you have.
If you run a carb, then keeping that port velocity high is important, and normally 180cc heads are the right way to go, but AFR does do a very good job keeping port velocity high. If it was me I would ask them about that.
The higher flow at lower lifts, when combined with a slightly larger CSA could just about equal the port velocity you are getting now, even with the larger port volumes.

skinny z

It's difficult to find enough information about different heads in one place however Stan Weiss' database is pretty good.
In this case, there are flow/port velocity numbers for both the RHS Pro Torker 170cc Vortec w/ 2.02/1.6 valves and the AFR 190cc Vortec.
As expected the 170cc port outperfroms the 190cc up to about .400" lift. Past that, the 190cc pulls away. The exhaust ports are a different story with the advantage to the smaller head only up to about .300".
Now if AFR made a Vortec version of their 180cc head...