G-Ride14

Summit Performance Cast Iron Cylinder Heads for Small Chevy: SUM-152123 - summitracing.com

Tried to do a search but came up with nothing, are these heads any good?

84 z28

I am pretty sure its the same exact heads as dart s/s. Summit just does some mods in house to the and throws there name on them.

GuitarJunki17

iTrader: (1)

I would think more similar to trickflow 23* heads, because Summit owns Trickflow.

84 z28

No the a dart cast. Check this out its an el camnio website but these are the exact same heads that im talking about. read the whole thing.

El Camino Central

Donald1992

got some decent stuff

dave-92gta

iTrader: (1)

i dont know to much about heads, but i think those would be a waist of cash. they are pretty much the same as stock heads out of a L98. i was told that the L98 was 163cc intake and had a 58cc combustion chamber. i think they are even the same lift as a stock L98 head in lift and they are cast iron. so why spend 700 bucks for a set of heads when you could get some off this site for 150 bucks and put maybe 200 to cleen them up.

Jekyll & Hyde

Aluminum L98 runners are 163cc, I believe the Cast Iron are 158cc. Not too much difference, but everything counts.

These heads are better than the cast since they can flow better with 163cc and 2.02/1.60 valves. They are probably better than the Aluminum L98 for flow, but the angled plugs and heat dissipation would be better in the AL98; much less the weight savings of 50lbs.

For pricing, these not too bad. You could get a set of AL98 heads for $300-$400 and spend about $300 on having them tanked and pressured checked, plus the springs, retainers, clips, and valves. In fact, you'd probably spend $900 on a full rebuild and bowl port job and still be running the stock size valves. These come built, ready to put on, and can handle a good sized lift from a good sized cam and are already 2.02/1.60. These would work well for a budget TPI build up with the right headers and cam, you'd make some really good torque for street racing or light to light racing.

shaggy56

If they are the same design as the Dart SS head then they should do pretty good. Here is the CHP test on those heads and they have smaller valves. You should see improved performance with the bigger valves. Some porting down the road could make them into some serious heads.

http://www.chevyhiperformance.com/te...ad_racing.html

dave-92gta

iTrader: (1)

those are ok, but they have a 73cc combustion chamber. now correct me if im wrong, but smaller is better comp ratio? anywho i got a set of L98s for cheep for my buddy. 100 bucks and 50 for shipping. said they were in good shape and they work great. a bit of sand blast and your set. then you can spend more money on other things. plus, you can do a good port job on the stockers. the only thing i like about those are the 2.02 intake and 1.6 exhaust. the stockers are not that good

TransAmMike

jekyll & hyde basically just described my buildup thats im starting in a month or so..

I have been looking at these heads myself, but cannot decide if i should get the vortech heads?

Can anyone tell me what the difference is between normal and vortech heads? I realize the vortech has a better intake runner and must be matched with a vortech manifold

Is vortech worth the extra cash?

327???

The iron summit heads are DEFINITELY Dart castings, i called both Dart and Summit.

GM Performance parts Vortec heads will outperform both non-vortec summit brand heads and summit brand vortecs(these have terrible exhaust flow). vortecs have taller and narrower intake ports. i'm shopping for heads in that price range now and will be going with the GM heads.

Jekyll & Hyde

Just make sure that the 73cc will make put you in the correct compression ratio for your buildup.

The vortec heads are actually pretty good. The vortec heads require a specific intake manifold (Vortec heads have 4 bolts attaching the intake manifold as opposed to the traditional six bolts). You can find this at www.sdpc2000.com if you are staying with TPI

They have a better design for flow and a higher runner design like the LT4 compared to LT1 heads. I've personally seen engines running 350-370 hp with vortec heads, hotcam, and the intake.

If they are worth the extra cash is all up to what you are building. If I were going to spend cash on the Vortec TPI intake baseplate, then I would probably spend the big cash and get the 385 fastburn heads, but that's just me. If you are keeping this on the street, then the vortec setup will do just fine. There are many people using those heads, do a search and see how their setups turned out before you purchasing anything..

EDIT: Also, the stock vortec heads need some work with the studs, they need to be drilled out and helia-coiled (sp?) to replace the press ins.

84 z28

I actually have a set of heads on my 355 that suppose out flow the vortec's in the higher rpm's. My engine builder told my that they are a "thunder" head from new zealand with a 2.02 and 1.60 valve's and something like a 180 runner. I got them bare for about $700.

shaggy56

This is the best deal going I can find on vortecs. These have many upgrades over stock GM vortecs. From what I hear they flow 240-245 cfm on the intake out of the box. Incidently I heard the Summitracing vortec heads are Topline heads and again better than stock GM castings.

http://cgi.ebay.com/ebaymotors/Chevr...spagenameZWD1V

327???

if they were topline heads then they would be better, but they aren't, they're dart and they're worse. the dart/summit vortecs flow 232/132. call them if you don't believe me.

RHS is very good also.

shaggy56

No I believe you. I guess they exhausted all the stock on the topline vortecs then. Yeah thats pretty sucky exhaust.

dave-92gta

iTrader: (1)

im getting these when ig et 700 bucks
http://cgi.ebay.ca/ALUMINUM-HEADS-NE...QQcmdZViewItem
they are bare heads, but they will out preform those summit ones, and there like 150 bucks more. you got to get a new intake, but they are really worth it. aluminum, a little porting, you got 200cc and boom, you got a 400-600 hp car. with the right setup

Hotrodder

What about these:
http://cgi.ebay.com/ebaymotors/SBC-C...mZ260073404486

GuitarJunki17

iTrader: (1)

I looked at the flow numbers, and although they seem decent, they dont include flow information for a lift under .400. That looks a little suspicious to me. But the price is crazy low for a set of aluminum heads. If I were in the market for heads, I'd give em a shot.

327???

that does look a little odd. i read on another forum that these are fairly thin castings.

not to get too off topic but how do you like your cam? powerband? i have the same one but have yet to assemble my engine. i got a KILLER deal on a set of trickflows from another member.