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361 blocks how much power can they take? #1319580 10/13/12 08:19 AM 10/13/12 08:19 AM
Joined: Jul 2009 Posts: 169 SW WI C cudacustoms1 OP member
cudacustoms1 OP member C Joined: Jul 2009 Posts: 169 SW WI	I have been looking into a class that runs a 377ci limit. You can run 8-71 blower 10% over or turbo. Just trying to think of the cheapest way to make power with a mopar. My question is has anyone pushed a 361 block. Are block any different from 383/400/440? How much power do you think they will hold? The hp numbers I have heard in this class is 1000-1100. Any input would be great. Thanks

Re: 361 blocks how much power can they take? [Re: cudacustoms1] #1319581 10/13/12 02:28 PM 10/13/12 02:28 PM
Joined: Jan 2003 Posts: 75,072 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,072 U.S.S.A.	Quote: I have been looking into a class that runs a 377ci limit. You can run 8-71 blower 10% over or turbo. Just trying to think of the cheapest way to make power with a mopar. My question is has anyone pushed a 361 block. Are block any different from 383/400/440? How much power do you think they will hold? The hp numbers I have heard in this class is 1000-1100. Any input would be great. Thanks I would find a thick web 400 block and have it sleeved down to the bore size you need to be at 377.

Re: 361 blocks how much power can they take? [Re: JohnRR] #1319582 10/13/12 03:27 PM 10/13/12 03:27 PM
Joined: Aug 2003 Posts: 43,252 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,252 Bend,OR USA	Quote: Quote: I have been looking into a class that runs a 377ci limit. You can run 8-71 blower 10% over or turbo. Just trying to think of the cheapest way to make power with a mopar. My question is has anyone pushed a 361 block. Are block any different from 383/400/440? How much power do you think they will hold? The hp numbers I have heard in this class is 1000-1100. Any input would be great. Thanks I would find a thick web 400 block and have it sleeved down to the bore size you need to be at 377. Better yet reduce the stroke to make the C.I., not the bore Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 361 blocks how much power can they take? [Re: Cab_Burge] #1319583 10/13/12 03:32 PM 10/13/12 03:32 PM
Joined: Jan 2008 Posts: 4,255 Canada WO23Coronet master
WO23Coronet master Joined: Jan 2008 Posts: 4,255 Canada	Quote: Quote: Quote: I have been looking into a class that runs a 377ci limit. You can run 8-71 blower 10% over or turbo. Just trying to think of the cheapest way to make power with a mopar. My question is has anyone pushed a 361 block. Are block any different from 383/400/440? How much power do you think they will hold? The hp numbers I have heard in this class is 1000-1100. Any input would be great. Thanks I would find a thick web 400 block and have it sleeved down to the bore size you need to be at 377. Better yet reduce the stroke to make the C.I., not the bore A 4.375 bore and a 3.125 stroke gives u 376 cu in. If u went with a 2.2 rod journal u should be able to offset grind it to 3.125". Will it be purely race or a street motor as well? Although, sleeving it down will give u some extra meat in the cyl walls, but destroking it and running longer rods will be easier on the bottom end and stave off cap walk a little better, which seems to be the death of these engines, just some things to ponder Last edited by WO23Coronet; 10/13/12 03:36 PM.

Re: 361 blocks how much power can they take? [Re: Cab_Burge] #1319584 10/13/12 03:48 PM 10/13/12 03:48 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Quote: Quote: I have been looking into a class that runs a 377ci limit. You can run 8-71 blower 10% over or turbo. Just trying to think of the cheapest way to make power with a mopar. My question is has anyone pushed a 361 block. Are block any different from 383/400/440? How much power do you think they will hold? The hp numbers I have heard in this class is 1000-1100. Any input would be great. Thanks I would find a thick web 400 block and have it sleeved down to the bore size you need to be at 377. Better yet reduce the stroke to make the C.I., not the bore I would de-stroke a 400 block, specially since your talking pressurizing it

Re: 361 blocks how much power can they take? [Re: MR_P_BODY] #1319585 10/13/12 04:07 PM 10/13/12 04:07 PM
Joined: Jan 2008 Posts: 4,255 Canada WO23Coronet master
WO23Coronet master Joined: Jan 2008 Posts: 4,255 Canada	If u went with a 4.375 bore, a 3.125 stroke, 7.1 rods, u would need a piston with a compression height of 1.3175" for zero deck, where a 1.32CH piston is a readily available piston for BB Mopars so this combo would work, well on paper anyway. U would have a rod/stroke ratio of 2.272 which would help your bottom end survive. I would go this direction if I were you

Re: 361 blocks how much power can they take? [Re: WO23Coronet] #1319586 10/13/12 07:02 PM 10/13/12 07:02 PM
Joined: Jul 2009 Posts: 169 SW WI C cudacustoms1 OP member
cudacustoms1 OP member C Joined: Jul 2009 Posts: 169 SW WI	What uses the 3.125 stroke that you are talking about? If you are talking a custom crank then I guess you missed the part about on the cheap.I like the 400 idea. Big boar /short stroke. A block you can find and not break the bank.The idea of sleaving all the holes would get pricey in a hurry.Plus I would like to keep the bore big to fit as big of valves as possible. It would be full race on alky. Last edited by cudacustoms1; 10/13/12 07:04 PM.

Re: 361 blocks how much power can they take? [Re: cudacustoms1] #1319587 10/13/12 08:03 PM 10/13/12 08:03 PM
Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada R RUNCHARGER I Live Here
RUNCHARGER I Live Here R Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada	You missed the part where you offset grind a stock 361 or 383 steel crank to get 3.125. This really sounds like a good build idea to me. Sheldon

Re: 361 blocks how much power can they take? [Re: RUNCHARGER] #1319588 10/13/12 09:33 PM 10/13/12 09:33 PM
Joined: Jul 2009 Posts: 169 SW WI C cudacustoms1 OP member
cudacustoms1 OP member C Joined: Jul 2009 Posts: 169 SW WI	Thanks I did miss that. Has any one heard what kind of HP a 400 block and offset ground crank could handle?

Re: 361 blocks how much power can they take? [Re: cudacustoms1] #1319589 10/13/12 11:34 PM 10/13/12 11:34 PM
Joined: Jan 2008 Posts: 4,255 Canada WO23Coronet master
WO23Coronet master Joined: Jan 2008 Posts: 4,255 Canada	Quote: What uses the 3.125 stroke that you are talking about? If you are talking a custom crank then I guess you missed the part about on the cheap.I like the 400 idea. Big boar /short stroke. A block you can find and not break the bank.The idea of sleaving all the holes would get pricey in a hurry.Plus I would like to keep the bore big to fit as big of valves as possible. It would be full race on alky. The only way to keep the big bore is with an offset ground crank and I guess I didn't specify I meant an offset 383 forged crank, which are about as cheap as they come. From what guys say on here a 400 block is good til 6-700 ish hp NA and that's usually using a stroker crank which is harder on the bottom end. But if u girdle it, give it a tall fill of hard block (race only engine on alky), use a turbo (supposed to be easier on a block than a supercharger) and since u would have a ridiculously good rod ratio because of the short stroke, it might live at the 1000-1000 hp mark. U could also run aluminum rods since this helps the bottom end survive better as well, but I know u are on the cheap so things could add up pretty quick. I think it would make a sweet combo and have a good chance of living On a side note, are 361 industrial blocks any better than a standard 361? Last edited by WO23Coronet; 10/13/12 11:45 PM.

Re: 361 blocks how much power can they take? [Re: MR_P_BODY] #1319590 10/14/12 08:12 AM 10/14/12 08:12 AM
Joined: Jan 2003 Posts: 10,012 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,012 Frostbitefalls MN (Rocky&Bullw...	Quote: Quote: Quote: Quote: I have been looking into a class that runs a 377ci limit. You can run 8-71 blower 10% over or turbo. Just trying to think of the cheapest way to make power with a mopar. My question is has anyone pushed a 361 block. Are block any different from 383/400/440? How much power do you think they will hold? The hp numbers I have heard in this class is 1000-1100. Any input would be great. Thanks I would find a thick web 400 block and have it sleeved down to the bore size you need to be at 377. Better yet reduce the stroke to make the C.I., not the bore I would de-stroke a 400 block, specially since your talking pressurizing it I would first do some research on how much cylinder wall thickness is going to be needed to keep things sealed up at boost. Then see if rings are available for the biggest big bore to short stroke combo I could put together. Its gotta seal first, then go with a big bore for airflow around the intake valves. What heads can you run? What fuel? I take it this is a drag racing class? Last edited by gregsdart; 10/14/12 08:15 AM. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: 361 blocks how much power can they take? [Re: gregsdart] #1319591 10/14/12 08:33 AM 10/14/12 08:33 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	My next question would be what is the track length for the races 1/4 or 1/8... the blower cars tend to be quicker in the 1/8 but the turbo cars are in the 1/4

Re: 361 blocks how much power can they take? [Re: MR_P_BODY] #1319592 10/14/12 05:28 PM 10/14/12 05:28 PM
Joined: Jan 2008 Posts: 4,255 Canada WO23Coronet master
WO23Coronet master Joined: Jan 2008 Posts: 4,255 Canada	What is the bigger issue with a 400 block for longevity? Cylinder bore thickness or cap walk? Thick cylinder bores are good I'm not questioning that at all but LS and Gen III Hemis have pretty thin bores from the factory and they survive pretty well at the 1000 hp mark, but they are way more robust than a 400 in the bottom end dept, which I think would be the 400's bigger issue. Speaking of which, why don't u go with a Gen III Hemi? 5.7's are dirt cheap, put in a 6.1 forged crank(cheap on EBay), some good Eagle heads and a turbo, 1000 hp + no sweat. If u don't want FI put a carb on and get the MSD Hemi 6 for the ignition.

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