keg1 Posted December 14, 2014 Share Posted December 14, 2014 Will a 2 valve engine work in a truck that has a 4 valve now. I don't have the truck here now but I think the front mount is different. Anyone know? Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/ Share on other sites More sharing options...
Superdog Posted December 14, 2014 Share Posted December 14, 2014 I would think the front mount would all depend on the truck it was going in,otherwise they would fit right in. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270438 Share on other sites More sharing options...
theakerstwo Posted December 14, 2014 Share Posted December 14, 2014 But you are going backward.You want be happy after rumming the 4 valve. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270443 Share on other sites More sharing options...
keg1 Posted December 14, 2014 Author Share Posted December 14, 2014 Thanks . The 2 valve is in my Superliner only has 7000miles since rebuild. R model is at Mack garage for over a week and there not making much progress so I'm thinking about dragging it home and put Superliner motor in it and get back to work. I will then fix 4 valve and put in Superliner. After all the work and money I've put in the Superliner I thought the 4 valve would be better in it. A lot of work to switch motors but I'm tired of garages charging so much and taking forever to do anything. They told me Friday I'm at $2000.00 already and they don't have it tore down yet. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270448 Share on other sites More sharing options...
theakerstwo Posted December 15, 2014 Share Posted December 15, 2014 Check and see if the turbo is turned same direction.One may have a manifold that the turbo sets straight out and one may be mounted upwards some. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270486 Share on other sites More sharing options...
smorse54 Posted December 15, 2014 Share Posted December 15, 2014 Hi,I understand why you're considering this. I've switched 2 valves for 4 valves and visa versa. The only thing that may be a slight problem is the front mount as you stated. Your RWS will have the circular trunnion mount with the 2 piece half moon rubber insulators. Depending on the year your 4 valve in the R model will have either a steel timing cover like your Superliner or a cast aluminun cover. If it is the steel cover the mount will bolt on your 2 valve engine. The mounting holes have to be drilled out and tapped to 7/16 from the 3/8 they now are to accept the bolts that are in the R model mount. If the R model 4 valve has a cast alum timing cover you will need to find another mount as they are slightly different. Should be no problem finding one. You can't swap timong covers cause the one with the alum. cover would have captive thrust washers on the camshaft ans accessory drive, while the 2 valve has thrust buttons with hex heads and lock nuts. Hope this helps and doesn't sound too confusing. Steve 1 Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270488 Share on other sites More sharing options...
keg1 Posted December 15, 2014 Author Share Posted December 15, 2014 Thanks for the help. When I get the R model back here I'll check it out. I just put a front main seal in it and I think it was a steel cover but my memory sucks so I'll have to wait and check it out. I found another 4 valve engine but I hate to spend the money and not know what im getting. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270512 Share on other sites More sharing options...
keg1 Posted December 19, 2014 Author Share Posted December 19, 2014 I had the truck towed home Wednesday and pulled the engine out. Of course the 4 valve had the cast timing cover. I decided against pulling the motor out of the Superliner. I went to Canton, Oh. to get another 4 valve engine, but it had a lot of things that were different so I took mine to get rebuilt. I figured while it was down I would replace the cab lights and of course the screws were rusted in the cab so now I have everything off and getting roof ready to paint Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270967 Share on other sites More sharing options...
GreenGiant2 Posted December 19, 2014 Share Posted December 19, 2014 do you know what actually happened Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270968 Share on other sites More sharing options...
keg1 Posted December 19, 2014 Author Share Posted December 19, 2014 Im pretty sure Dynatard stuck, bent pushrods, took lobe off cam, not sure what else. I had problem with it about a year ago. The guy that worked on it was supposed to put a jake on it some weekend so I didn't have to be down again and time went by and I kind of forgot about it. This brought it to my attention though. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270971 Share on other sites More sharing options...
mack mhe9 Posted December 19, 2014 Share Posted December 19, 2014 i hate fixing the truck that's supposed to be working while the truck you want to fix sits there. at least all the parts will work with the RW if you need to. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270973 Share on other sites More sharing options...
keg1 Posted December 19, 2014 Author Share Posted December 19, 2014 I think the R model is jealous, everytime I start working on the Superliner something needs fixed. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-270985 Share on other sites More sharing options...
Timmyb Posted December 20, 2014 Share Posted December 20, 2014 Things are moving along nicely. What's a rebuild worth over there (USA)? Did you notice a performance difference between the 2v and 4v? Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-271007 Share on other sites More sharing options...
keg1 Posted December 21, 2014 Author Share Posted December 21, 2014 I just took motor to get rebuilt so not sure of cost. The 4 valve runs a little better than 2 valve. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-271132 Share on other sites More sharing options...
keg1 Posted January 4, 2015 Author Share Posted January 4, 2015 I got the roof painted and new led cab lights on. While I was working on the Superliner today the wife painted the inside of the frame rails so now im ready for the new motor. Supposedly next Friday I might get it back. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-273172 Share on other sites More sharing options...
scottwetzel Posted January 5, 2015 Share Posted January 5, 2015 Keep us posted driver. Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-273187 Share on other sites More sharing options...
keg1 Posted January 18, 2015 Author Share Posted January 18, 2015 Got motor back yesterday. Everything is in and hooked up. I want to go over everything again and hopefully it will be running tomorrow. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-274794 Share on other sites More sharing options...
1958 F.W.D. Posted January 18, 2015 Share Posted January 18, 2015 Keep posting those updates. Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/38105-350-4-valve-to-350-2valve/#findComment-274799 Share on other sites More sharing options...
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