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| 198 Rod Conversion? https://www.slantsix.org/forum/viewtopic.php?t=5634 |
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| Author: | ceej [ Thu May 01, 2003 9:09 pm ] |
| Post subject: | 198 Rod Conversion? |
 I've priced 2.2 Turbo pistons, but am having trouble finding 198 Rods. What sources are out there for new? With the Long Rod conversion, if the head is shaved, will the KB pistons be able to absorb the valve relief? This will run on 92 Octane Pump gas. Should I forgo milling the head? Just ordered a comp cams 64-241-4 "K" Kit. (4 weeks wait...) My piston source quoted a price of ~$230 for a set of 6. Sound about right? Thanks! CJ Valiant |
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| Author: | Doc [ Fri May 02, 2003 9:46 am ] |
| Post subject: | |
The 198 rods are the hardest thing to find for this combo. 198's were only offered for 5 years as a "base engine" (1970-74) There are no known supplies for NOS / new factory forgings, there are some aftermarket 7 inch rods offered through the Cox Boys. ($$$) I think there are some possible sources for used 198 con rods listed in the parts database. Your quoted piston price is "spot-on" but get the 198 rods "in hand" before ordering pistons. DD |
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| Author: | ceej [ Fri May 02, 2003 11:07 am ] |
| Post subject: | 198 Rods |
Copy that. I'll see if one of our local /6 collectors has a 198 or some substantial chunks of one. Thanks for the Reply!  CJ |
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| Author: | Rick Covalt [ Fri May 02, 2003 3:18 pm ] |
| Post subject: | Pistons |
Are these pistons the forged units?? Rick |
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| Author: | slantzilla [ Fri May 02, 2003 8:56 pm ] |
| Post subject: | |
At $230 they sound like Hyperteutectics. They will bite you about another $120 for rings.  In all honesty, I have a 198/2.2 motor and I am not really convinced that the extra hassle of finding the rods and pistons is worth it. If I was building a high winder and wanted the lightest possible pistons, then yes it would. For an average street motor, I don't really think so.  (I am building another one for my race car though.  )
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| Author: | ceej [ Fri May 02, 2003 9:55 pm ] |
| Post subject: | |
These Pistons are the KB268's. So far I've been striking out on the rods. As this is a street engine, perhaps I'll go in another direction. As is, I'll need to cut the Head down to make use of the cam. I'm wondering if the GM 3.8 Throttle Body set-up is going to flow enough air... Fortunately, I'm finding lots of options for the intake and exhaust. I've got two complete exhaust manifolds for a Dual if needed. (And the big cam is on it's way) Nothing like getting started a bit early....  I'll have my favorite machine shop rework the heads when the Cam gets here. Any thoughts on how much to take off for 92 pump gas? What is the thickness of the Felpro Head Gasket? CJ |
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| Author: | DusterIdiot [ Fri May 02, 2003 10:23 pm ] |
| Post subject: | Some info... |
'Squash' height of the fel-pro composite gasket is .039-.043.... GM TB's usually flow 670 cfm... good luck on the build up... -D.Idiot |
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| Author: | MitchB [ Sat May 03, 2003 10:27 am ] |
| Post subject: | |
You should be able to safely run between 9.5:1 to 10:1. I milled the head on my stock slant to give about 9.5:1 with no problems. Mitch |
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| Author: | MitchB [ Sun May 04, 2003 4:10 am ] |
| Post subject: | |
There is currently a set of 198 rods on Ebay: http://cgi.ebay.com/ebaymotors/ws/eBayI ... gory=33623 Mitch |
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| Author: | slantzilla [ Sun May 04, 2003 5:34 am ] |
| Post subject: | |
I do want to amend my statements from the other night here now that I'm awake. While I am not too sure that the 198/2.2 combo makes any more power than a stock piston/rod deal, it does seem to make the engine very resistant to detonation. Mine is right at 11-1 and it runs on pump gas.
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| Author: | ceej [ Sun May 04, 2003 9:14 am ] |
| Post subject: | |
Dontcha Love Ebay. Gonna have to bid some more I guess. I thought I saw an outfit selling 198 Rods for ~$35 a piece somewhere. Any leads on that? I'll go trundling about the articles again. Maybe I'll find something. At 670CFM I doubt I'll have any breathing issues. I'd better do something substantial with my exhaust though! Thanks for all the leads and information! CJ |
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| Author: | moparfiend [ Sun May 04, 2003 5:50 pm ] |
| Post subject: | |
http://cgi.ebay.com/ebaymotors/ws/eBayI ... gory=33623 http://www.moparts.org/ubb/Forum14/HTML/000165.html the ones at moparts are only 80 bucks shipped |
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| Author: | slantzilla [ Sun May 04, 2003 7:40 pm ] |
| Post subject: | |
Quote: http://www.moparts.org/ubb/Forum14/HTML/000165.html
Ah yes, my old buddy Mark "Slant 6's suck" Nixon. the ones at moparts are only 80 bucks shipped 
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| Author: | ceej [ Sun May 04, 2003 9:08 pm ] |
| Post subject: | |
Thanks! Just sent a message to try to get that set. CJ |
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| Author: | ceej [ Mon May 05, 2003 8:11 am ] |
| Post subject: | |
Nope. Already sold. Keep me in mind if you see a set. I'm still lookin' I'll get back up on Ebay and see where that set is at. CJ |
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