Author Topic: bottom end question  (Read 12256 times)

Offline jdhall144

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Re: bottom end question
« Reply #15 on: April 27, 2011, 07:50:40 PM »
2 bolt is fine for that build.Im assuming a stock converter could have been used on this build also but the 2500 will be nice to have the motor flash into its meat.I run a 750 on a 355 but a whole different build.As for cam i dont think it will have a noticable idle but its possible.My .02 on whole build off your dish pistons and throw some flat tops in.It will be fine on pump gas.I know allot of circle track racers runnin 2 bolts twistin em 7500-8000rpms so i really think youll be fine with this cam.That cam is prob good for a 5200rpm shift.hope this helps and good luck.

Offline 305chevy c-10

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Re: bottom end question
« Reply #16 on: May 09, 2011, 08:57:04 PM »
just left machine shop .guy talked me into clearancing for 383 ...........eagle steel crank  ordered ..he told me to stud the main caps instead of bolts and i should be fine for 383 .....what do you guys think ......also ......for this ex balanced crank dont my flex plate and balancer have to be ex balanced also ...................same set up as before but got 600cfm holley and gonna be 383 not 355
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Offline Lt.Del

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Re: bottom end question
« Reply #17 on: May 09, 2011, 10:34:08 PM »
anyone rebuilding a 350 and not converting it to a 383 needs to see a shrink.  OK that may be a little harsh, everyone has their reasons.  But with such slight mods and a maximum advantage, a 383 is a terrific modification for more torque.  They call these things stump pullers for a reason.
But, in addition to a 400 cid crank, you will need a 400 cid flex plate and balancer.
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Offline malibu795

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Re: bottom end question
« Reply #18 on: May 17, 2011, 10:48:24 AM »
drop the 2400/2500 stahl
2000 is plenty for that small of cam.
with your gear tire setup you will be runin ~2400rpm @65.. cruising at stahl speed is very inefcient.. and create alot of heat in the tranny as well.

def raise the comrpession to min 9:1 close to 10 the better

BTW im running a 2 bolt 383 setup for 7000 havent had a problem, no sign of main caps walkin either... bottem end is in need of a rebuild been runing it for ~8 years now. lots of blow-by at idle and WOT..
adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline 305chevy c-10

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Re: bottom end question
« Reply #19 on: May 17, 2011, 07:36:59 PM »
i cant seem to find a flexplate that for 1pc RMS  .they all say 2pc and internal bal .......buy the way i have read that u can blow the motor with flat top pistons on vortec heads .....that y i used dished ..............also are u  using a m55hv oil pump or standard ...i have a 7qt pan ......i was told that a hv pump would suck a standard pan dry ........
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Offline malibu795

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Re: bottom end question
« Reply #20 on: May 17, 2011, 09:02:58 PM »
HV oil pumps can suck oil pan dry IF you spin it fast enough IE drag racing time frame.you can do this with stock volume as well... i run HV pump in in all three engine i have dd for extened period of time.. 305, 383 and 468.. i go easy on the engine till warmed up... theres a high risk when could due to oil its thicker when cold and cant drain back fast enough..
flex for a 1 peice sbc heres a part number...pick one 168 or 153, internal or external inlcuding sfi spec... http://www.summitracing.com/search/Part-Type/Flexplates/Engine-Type/V8/Make/CHEVROLET/Engine-Size/5-7L-350/Rear-Main-Seal-Style/1-piece/?Ns=Price|Asc
blowing a engine with flat tops? only if way is the had serious interverance issue with valvetrian.. there was assemblee issue or the person doenst know what he was talking about..
im rungin flat tops in my 383(piston never come above the deck) and domed in my 468
adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline beastie_3

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Re: bottom end question
« Reply #21 on: May 18, 2011, 01:18:50 PM »
i would think that if you have a larger capacity oil pan, sucking it dry shouldnt be as much of a problem as a stock capacity.

Offline Grim 82

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Re: bottom end question
« Reply #22 on: May 18, 2011, 01:41:28 PM »
i cant seem to find a flexplate

If you are running a 2 piece RMS use a standard (weighted) 400 flexplate. The later one piece RMS engines are also weighted but are a different bolt pattern. If that's what you need then look for one for a TBI truck, 87-??, or if you are local to ND I have one in my garage that I will probably never use off an 88 TBI 350.
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Offline malibu795

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Re: bottom end question
« Reply #23 on: May 19, 2011, 11:02:53 AM »
i would think that if you have a larger capacity oil pan, sucking it dry shouldnt be as much of a problem as a stock capacity.
It mainly is detrimin by how fast the oil drain back down... oil temp weight and cleanlyness of the engine determin this.
Oil cools the valvetrian and r/a as well as lubercation. I run hv pumps cuase I rarely spin past 3k and I have ample amount of coolin on the valvetrain. And usually have a load on it
adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline 305chevy c-10

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Re: bottom end question
« Reply #24 on: May 19, 2011, 08:30:33 PM »
when getting block clearanced for 383 ...do i need to have my balancer and flex plate to get it balanced or this can be done at home .or is a machine required ...i dont want to haul the block up there for the clearancing ..then have bring it back later when i get the flexplate & balancer .........also i read that stock rods are just as good to use on mild builds ....i was told the are forged not cast ..........clearancing ,press on new pistons,new cam bearings and re-hot tank it  is 179.00 .......u think thats reasonable
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Offline 305chevy c-10

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Re: bottom end question
« Reply #25 on: May 24, 2011, 03:55:13 PM »
wow ........the machine shops eating my wallet .............275(port match intake for eq vortec heads ).179 (press on new pistons ,clearance block for 3.75 crank,rehot tank ).250 (balance rotating assem).185(machine the block +030,freeze plugs,cam bearings,hottank ).........wow my 305 is looking real good right about now... lol
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Offline Psycho71

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Re: bottom end question
« Reply #26 on: May 24, 2011, 08:14:46 PM »
That feeling will pass as soon as you turn the key on that engine. It will all be worth it then.
There are two tools needed, duct tape and WD40. If it moves and shouldn't, use the duct tape. If it doesn't move and should, use the WD 40.

Offline slammed79

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Re: bottom end question
« Reply #27 on: May 26, 2011, 05:54:05 PM »
That feeling will pass as soon as you turn the key on that engine. It will all be worth it then.

Agreed!
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Offline HAULIN IT

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Re: bottom end question
« Reply #28 on: May 26, 2011, 06:46:40 PM »
..275(port match intake for eq vortec heads )
Have you done this already? ::) It is a mistake at this point for a couple reasons. One is cost...that is WAY too much money (we are talking US dollars, correct?) for what anyone should/would do for a "driver pickup truck". Two, until the heads are on the finished, decked block with the correct head & intake gaskets...the top/bottom relationship can't be known, forward/backwards from head to head can't be known. Sure they can play around making the intake port opening match some opening in a gasket, but until you know how deep the intake sits in the "V" & where front to back placement is, no port matching should be done since they most likely won't line up once the engine is assembled...half of the time the gasket needs cut (either the bolt holes slotted or a side trimmed in the port) to end up with a correct relationship. I'll say it again: Port matching for the most part is way over rated. You'll never see or feel the difference of a 1/16" or ever an 1/8" out of line parts on an average street engine, so if you can't do it yourself or have it done correctly for a a reasonable fee (1-2 hrs.) Don't bother. My Two Cents...not that you asked for them ;) Lorne   
 

Offline 305chevy c-10

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Re: bottom end question
« Reply #29 on: May 26, 2011, 09:19:17 PM »
yeah its done already .he had the block and intake gaskets .....that was also fo putting in new retainers,vavle seats ,and guide plates with screw in studs
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