e-tec's, 170 or 200cc runners? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-23-2008, 10:38 AM
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e-tec's, 170 or 200cc runners?

I figured I start another thread since this question really doesnt fit into my other thread i had going. Ive decided to pony up the money and buy a set of e-tecs for my new engine build. (.040 smallblock 350 will be 9.9.1 with these heads). Street driven high performance use. 2500-3k stall with 3.73 rear gears. I cant decide between the comp xr276hr or xr282hr cam. I think i should stick to the 170 runners, but it seems everyone is getting the 200's? Any thoughts here?
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Old 06-23-2008, 11:20 AM
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You want the 200cc runner.
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Old 06-23-2008, 03:01 PM
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can you give me the reason behind this? Im not saying your wrong just wondering why go 200 over 170? I thought the 170 would be better for a street car but i dont know?
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Old 06-23-2008, 04:09 PM
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Quote:
Originally Posted by redbandit98
can you give me the reason behind this? Im not saying your wrong just wondering why go 200 over 170? I thought the 170 would be better for a street car but i dont know?
For mainly street you'de probably like the 170cc & 276hr better and get bottom end torque. If you plan on more strip use go with the 200cc & 282hr & up.
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Old 06-23-2008, 05:36 PM
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im just worried the 276 wont idle like i want it to. Im not looking for a dragster idle, but I do want it to have some thump to it. Ive searched for some sound clips and only came up with one that was on a 112lsa and it sounded almost like a stock cammed car.
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Old 06-23-2008, 06:15 PM
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Quote:
Originally Posted by redbandit98
im just worried the 276 wont idle like i want it to. Im not looking for a dragster idle, but I do want it to have some thump to it. Ive searched for some sound clips and only came up with one that was on a 112lsa and it sounded almost like a stock cammed car.
The 110LSA will have more lope than 112LSA also.
Comps description for the XR276HR says 1900-5600rpm High performance street machines, 2000+stall, gears, choppy idle. 224/230@.50Dur. .502/510Lift 110LSa

For the XR282HR it says 2200-5800rpm Great for street machines,needs intake, headers, stall, gears. 230/236@.50Dur. .510/.520Lift , 110LSA

Just depends on how much low speed torque you're willing to sacrifice. Either of these is going to thump.
Friend of mine has the XE262H flat tappet hydraulic in a Vortec headed 383 and it thumps pretty darn good. And it will boil the tires off the rim down low.
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Old 06-23-2008, 08:24 PM
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Quote:
Originally Posted by redbandit98
can you give me the reason behind this? Im not saying your wrong just wondering why go 200 over 170? I thought the 170 would be better for a street car but i dont know?
It's a 350 and you are looking at a decent camshaft. You'll have an engine that will want to RPM somewhat. If you had a 283, 302 I'd lean to the 170's. A 170cc runner is a quite small head for a 350. The 200's flow better.

You will have PLENTY of torque on the street.

Given your compression and converter selection I'd have no problems sticking in the 282.

OH, and we have used these heads over the past couple of years and know how they work.
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Old 06-24-2008, 07:50 AM
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Quote:
You want the 200cc runner
Zacklee!
Quote:
can you give me the reason behind this? Im not saying your wrong just wondering why go 200 over 170? I thought the 170 would be better for a street car but i dont know?
IMO it's what you want, but just don't know it yet. Also, there is no crutch for too small a runner. The 200 is your best choice in this deal... the 170 and your 3000 stall conv would run like Larry King.
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Old 06-24-2008, 11:28 AM
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When you read this it may appear that Iím contradicting what others are
saying; if you read carefully you will see thatís not the case at all.

My personal preference would be the high velocity 170 cc intake runners for
two reasons. These ports will perform better at low RPM, higher air speed
for improved cylinder filling and reduced fuel drop out. The key is to obtain
equal or better flow at high RPM with the small port. This will require proper
porting of the 170 cc runner to 175 -180 cc. The results will be the best
of both worlds, stellar low RPM performance with high RPM capability.

I do this often with Eldebrock RPM, Iron vortec and LT1 heads; flow that
beats the as cast e-tec 200 cc runner head with a smaller port volume.
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Old 06-24-2008, 11:46 AM
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Who can argue with that? ^^^ I have yet to see any 170's run - vs a 200. I based my opinion on relative past stuff and what I have seen. I respect AB's opinion here, and cannot argue what he says and has worked for him. I do know some heads/chambers to be more efficient too, which may or may not have any bearing on this application/use. If it were mine I'd still opt for the 200, the 170 if I were pulling a boat.
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Old 06-24-2008, 04:16 PM
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heck, i couldnt argue that either, im sure it would work great if i knew what i was doing on the porting. I, however am forced to go with one or the other. I will just go with the 200cc if i do infact go with them. Im just having problems spending the dough. That kind of hurts the ol pocketbook. I wish to heck i could run the 9.9cr with the iron vortecs, but i know it will ping. I figured the inly other option is some cheap iron 76cc's such as a sr torquer. By my reading, these things just dont do to great out of the box and thats how i arrived on the e-tecs.
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