beatngu Posted February 14, 2018 Share Posted February 14, 2018 Well having the 401 race ready and waiting for tax refund to show up to buy rubber has had me thinking about the repower project. Would a 671 or 6v53 fit and mate to the quadbox? I am in the dark about differences in clutches and bellhousing patterns. Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/ Share on other sites More sharing options...
h67st Posted February 14, 2018 Share Posted February 14, 2018 I don't know anything about fit, but a B with a 2 cycle would be cool! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-391986 Share on other sites More sharing options...
beatngu Posted February 14, 2018 Author Share Posted February 14, 2018 I am thinking the 671 is too long, the 6v53 can fit in some pickups so it may be an easier fit. The idea is just having 1 truck with everything I want rather than buying a separate unit just to have a driptroit Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392003 Share on other sites More sharing options...
1965 Posted February 14, 2018 Share Posted February 14, 2018 23 minutes ago, beatngu said: I am thinking the 671 is too long, the 6v53 can fit in some pickups so it may be an easier fit. The idea is just having 1 truck with everything I want rather than buying a separate unit just to have a driptroit They make 6V71 & 92’s Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392004 Share on other sites More sharing options...
Freightrain Posted February 14, 2018 Share Posted February 14, 2018 I would bet a 6v71 would fit fine. They did put V8's in the B, but they did take up all the room and under the access panels on the fenders. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392010 Share on other sites More sharing options...
terry Posted February 14, 2018 Share Posted February 14, 2018 the gassers were pretty slow, put a diesel ahead of gas rears you might get 50 mph, depends on the ratio, I took a B421 mack that had the 401 gas, put a 637 in it and barely could get 50 out of it. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392020 Share on other sites More sharing options...
1965 Posted February 14, 2018 Share Posted February 14, 2018 11 minutes ago, terry said: the gassers were pretty slow, put a diesel ahead of gas rears you might get 50 mph, depends on the ratio, I took a B421 mack that had the 401 gas, put a 637 in it and barely could get 50 out of it. terry The 6V-53 would be the best in that they turn 2800 rpm you can get 3000 out of them safe. But lord the noise. If I put a 53 in it I’d have to turbo it to quite it down. 6V-92 natural aspirated would be cool if the turbo took too much room. Same size as V71’s Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392025 Share on other sites More sharing options...
Maddog13407 Posted February 15, 2018 Share Posted February 15, 2018 seen an 8v71 stuffed in a B61 and an R400 before. shoehorned in there but it fit so i take it a 6v71 would not be a problem Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392056 Share on other sites More sharing options...
Freightrain Posted February 15, 2018 Share Posted February 15, 2018 Imagine a 300 hp 6v92 and get some good highway gears out back? I would recommend getting rid of the baby quad though. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392057 Share on other sites More sharing options...
beatngu Posted February 15, 2018 Author Share Posted February 15, 2018 It has an odd ratio I think it is 7.23 the tandems in my donor has 6.34s with 20 inch rubber. I pondered long and hard on the idea of swapping them but thought it might ride funny with smaller rubber in the back and the front axle would be pretty close to the cab Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392059 Share on other sites More sharing options...
General Ike Posted February 15, 2018 Share Posted February 15, 2018 I have a turbo 6V53 in my '57 B-85F. It fits fine. Pic attached... she's a little dusty. 2 Quote Ed Smith1957 B85F 1242 "The General Ike" Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392076 Share on other sites More sharing options...
beatngu Posted February 15, 2018 Author Share Posted February 15, 2018 Take her out for a ride! Did you do the repower yourself? Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392080 Share on other sites More sharing options...
Popular Post Red Horse Posted February 15, 2018 Popular Post Share Posted February 15, 2018 2 hours ago, General Ike said: I have a turbo 6V53 in my '57 B-85F. It fits fine. Pic attached... she's a little dusty. Why the siren?? Isn't the 6V-53 enough noise??? 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392084 Share on other sites More sharing options...
Freightrain Posted February 15, 2018 Share Posted February 15, 2018 13 hours ago, beatngu said: It has an odd ratio I think it is 7.23 the tandems in my donor has 6.34s with 20 inch rubber. I pondered long and hard on the idea of swapping them but thought it might ride funny with smaller rubber in the back and the front axle would be pretty close to the cab Time to fine a single axle air ride and slip it under it. Faster and smoother. My Ford frame was a simple slip fit and bolt. No welding required. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392091 Share on other sites More sharing options...
General Ike Posted February 15, 2018 Share Posted February 15, 2018 2 hours ago, beatngu said: Take her out for a ride! Did you do the repower yourself? I didn't. The repower was done in the late '70s or early '80s. I've heard conflicting stories about where the engine came from. The Boro of Gettysburg did the swap and it either came out of a wrecked Boro dump truck or large loader of sorts. It went from red to slime lime near that time too. I put it back to red. Rode to many a call on this rig before it was taken out of service in 1998. I graduated from Gettysburg College and the GFD still hadn't sold it in the early 2000's so I bought it and restored it. Left the motor in it and a few other modifications as well as that is how it spent the majority of its useful life. 1 Quote Ed Smith1957 B85F 1242 "The General Ike" Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392092 Share on other sites More sharing options...
General Ike Posted February 15, 2018 Share Posted February 15, 2018 1 hour ago, Red Horse said: Why the siren?? Isn't the 6V-53 enough noise??? It does sound awesome. When you do more that 25 or 30mph, the well broken in Federal Q2 siren growls in the wind. Quote Ed Smith1957 B85F 1242 "The General Ike" Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392093 Share on other sites More sharing options...
beatngu Posted February 17, 2018 Author Share Posted February 17, 2018 I found a 671 mated to a rt910 for $500 would really go at a snails pace with direct drive. Did they make different gear sets for the rad 508? Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392238 Share on other sites More sharing options...
Hobert62 Posted February 17, 2018 Share Posted February 17, 2018 I know where there's a 4 speed spicer auxilary transmission with a .83 overdrive. Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392246 Share on other sites More sharing options...
gxbxc Posted February 17, 2018 Share Posted February 17, 2018 I remember back in the late 70's early eighties contractor in Danbury Ct EPK . One of the mechanics put a v 6 something in a little B model 6 wheeler (it had broken down in the sixties and different parts were robbed for other trucks ,it was straight and not wrecked ) they put it back together with the V6 and it used to scream ,but you shifted it all day long . Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392249 Share on other sites More sharing options...
beatngu Posted February 17, 2018 Author Share Posted February 17, 2018 I will run the flathead for the spring so I can enjoy it before it is in pieces in a garage, I am sure someone on here would want a running 401 for their project. Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392300 Share on other sites More sharing options...
terry Posted February 17, 2018 Share Posted February 17, 2018 52 minutes ago, beatngu said: I will run the flathead for the spring so I can enjoy it before it is in pieces in a garage, I am sure someone on here would want a running 401 for their project. Got to be hard to find a good running one!! terry Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392302 Share on other sites More sharing options...
russell t Posted February 19, 2018 Share Posted February 19, 2018 let me know when the 401 is available RT Quote Link to comment https://www.bigmacktrucks.com/topic/52510-b42-plans/#findComment-392383 Share on other sites More sharing options...
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