RAGEman

iTrader: (4)

Has anyone heard of this happening? A good source told me he lost power across the board with that switch. Subject car had a TR 230/224 cam, too. Is this normal or just a freak thing or what?

383ss

iTrader: (14)

stepped headers are only supposed to give gains on bigger cube engines.

The Derek H

I've seen it happen. Probably the same car you are referring to. I don't think you will ever need stepped or true 1 7/8 headers until you are well over 400 cubic inches or have larger than a 4.100 bore. Just my opinion. You have to be pushing a lot of air into the engine to use that big of a primary and collector.

RAGEman

iTrader: (4)

Thanks, guys. Here's the thing, though. I can understand why going with stepped headers may show little to no gain on a 346, but I don't understand how it could show a loss of horsepower up in the high-RPM range, or especially all across the board. Can anyone explain this? Derek, it prolly is the same car. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

The Derek H

I'm not sure what it is. On the car I'm referring to they picked some of the power back up just by putting 3" reducers on the 3.5" merge collectors but never got back to the power of the 1 3/4 grots

John B

iTrader: (10)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">I don't think you will ever need stepped or true 1 7/8 headers until you are well over 400 cubic inches or have larger than a 4.100 bore. Just my opinion. You have to be pushing a lot of air into the engine to use that big of a primary and collector </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'd sure like to see the facts and data that would back this up because I find it hard to believe that I would gain power over my current set-up with "only" a straight 1-3/4" header <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

RAGEman

iTrader: (4)

TTT. Come on, guys. It's header-buying time!!

383ss

iTrader: (14)

I'm gonna try some stepped dynatechs with high flow collectors on my app and see what happens.

Colonel

I'm not a big stepped header fan. They try to bridge the gap between larger and smaller tubed headers which can be a good thing for some applications. For most I think a really good straight header is better. I have a set of 1 7/8" mid-length straight headers on my race car (mid length being a little better for high RPM power) and I have on order a set of 1 3/4" QTPs (this design formerly made by Grott) for my street car Z28.

<small>[ November 04, 2002, 12:59 PM: Message edited by: Colonel ]</small>

SStolen

iTrader: (22)

I have never seen a place that sells QTP/Grotts headers. I've only seem a handful of guys with them as well, normally higher hp guys though. I was going to go with the Jet Hot Coated Hookers for $600. How much are the grotts and any advantages with them? If the colonel has them then they must be better <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Thanks.

GeorgeC

You can find the QTP headers at Quick Time Performance. They are the same design as the Grotts everyone is so fond of, but these are actually available. <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

JS

iTrader: (4)

I saw 5RWHP above 5900rpm going to a stepped over the MACS.

I LOST 20RW from 3000 to 5500 though so I took them off.

IMO the stepped version isnt good for a 346CI motor unless your shifting at 7500,running boost or use N20.

1 3/4 is the way to go for most applications.I went w/HOOKERS.They fit perfectly,make good power and cost MUCH less than a GROT.

Look at the Coach's car (3500lb),11.02@120+ proves the HOOKERS ROCK!!

JS

RAMBIRD2002

Just like John B posted earlier in this discussion I also have dynatech stepped headers with merge collectors and an ory pipe with a trick y collector thru stock ws6 exhaust. Completely stock car with a lid and I gained 51hp & 50tq. So for all you guys who think stepped headers are a waste, your all missing out. Think what you want these things work like a SOB.

383ss

iTrader: (14)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAMBIRD2002:
<strong>Just like John B posted earlier in this discussion I also have dynatech stepped headers with merge collectors and an ory pipe with a trick y collector thru stock ws6 exhaust. Completely stock car with a lid and I gained 51hp & 50tq. So for all you guys who think stepped headers are a waste, your all missing out. Think what you want these things work like a SOB.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">did you lose any low end?

John B

iTrader: (10)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> I LOST 20RW from 3000 to 5500 though so I took them off. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">JS, something still sounds odd here....my stepped headers with a dinky B1 cam make 350 RWTQ at 3000RPM. I don't think I've seen this kind of RWTQ out of 1-3/4" headers for this size cam.

JS

iTrader: (4)

John I can fax u the sheet..

The MACS KILLED the STEPPED DYNAS until 5900RPM then the MACS lost by only 5RWHP.

Both TQ and HP were down (18HP/18TQ )below 5500 with the big headers.I dont understand it either but since putting on the 1 3/4in HOOKERS my power is back...

JS

John B

iTrader: (10)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> John I can fax u the sheet..
The MACS KILLED the STEPPED DYNAS until 5900RPM then the MACS lost by only 5RWHP. Both TQ and HP were down (18HP/18TQ )below 5500 with the big headers.I dont understand it either but since putting on the 1 3/4in HOOKERS my power is back...
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">JS, it's not that I don't believe you, you obviously have the facts and data logged on your dyno sheet. The only thing that concerns me about these comparisons is when they are not done on the same day on the same dyno and no tuning changes are made to see if one merely needs a different tweaking of A/F or timing to take advantage of better scavenging characteristics. Was this comparison made "open header" against "open header"?

RAMBIRD2002

383ss No I didn't lose any low end what so ever, in fact on the dyno graph torque was at 3500/375-4000/380- and it peaked out 4400/394. So to answer your question it is a lot snappier in my opinion. DYNATECH'S ROCK.

Bad02WS6

RAMBIRD202 </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Completely stock car with a lid and I gained 51hp & 50tq. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">At the wheels?

383ss

iTrader: (14)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RAMBIRD2002:
<strong>383ss No I didn't lose any low end what so ever, in fact on the dyno graph torque was at 3500/375-4000/380- and it peaked out 4400/394. So to answer your question it is a lot snappier in my opinion. DYNATECH'S ROCK.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">that's what I want to hear! I'm gonna find out for myself anyway. the stepped with high flow collectors should be going on soon. I'll post before and after dyno numbers with graphs!!