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Bbc .30 over

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bobjthomson

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« on: December 04, 2017, 10:56:02 PM »
Hey brothers just wanted to see if any of u Chevy motor owners can help , pulled my motor apart to see whatís in it and found out the crank is .20 under . Has pro speed pistons and standard connecting rods . So would like some advice on a bottom rotating set up ........... Aquaholic u can stay out of this conversation . Any help would be appreciated and I am trying to do this on a budget if I can .


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aquaholic72

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« Reply #1 on: December 04, 2017, 11:10:07 PM »
Damn!!  I own a Chevy powered v-drive!  You cut me deep Bob!  Cut me deep!!  😓

your friendly local v-drive owner

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bobjthomson

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« Reply #2 on: December 04, 2017, 11:53:55 PM »
He heheheheheh , sorry bro , u can help out if u want , have a 30 pack just too make it up


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aquaholic72

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« Reply #3 on: December 05, 2017, 12:21:30 AM »
I'm gonna have to hit the fireball bottle to heal these wounds sir!! 

your friendly local v-drive owner

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aquaholic72

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« Reply #4 on: December 05, 2017, 12:24:03 AM »
Anyways,,  what are you trying to put together?  You said budget,  but what are you expecting from it?  Trust me I know what budget means,  if you ever see the yellow turd you'll be like damn,  this dudes on a budget!!  Lol

your friendly local v-drive owner

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bobjthomson

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« Reply #5 on: December 05, 2017, 12:44:31 AM »
Bwhahahahahahah , budget !!! Donít want junk bottom end stuff looking about $2k , been looking and researching and all I see is Eagle this scat that and ppl talking shit about both , RPM was mentioned and some others . I want to find out whoís running what and take it from there.


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aquaholic72

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« Reply #6 on: December 05, 2017, 12:59:37 AM »
Iv ran scat and eagle stuff in a 496 I use to run in a street car with a big shot nitrous kit on top of it and never had a problem, and I drove the shit out of the car!  My boat BBC has a factory gm forged crank .20 under,  stock rods and factory gm forged pistons..  It has 5 seasons on it,  last 2 with the lil blower on top of it.  And has yet to come apart!!  Knock on wood!!  Lol you can put together a solid rotator for 2k..  Especially if you're not trying to stroke it... 

your friendly local v-drive owner

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aquaholic72

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« Reply #7 on: December 05, 2017, 01:23:19 AM »
What you have to remember is,  picking the parts is only so much of the equation.  What you do with them when you get them has a lot to do with the outcome.  I bought an eagle balanced rotator assembly for my 496 back in the day..  Eagle crank, scat h beam rods forged srp pistons internally balanced ready to go!!  I sent it all to the machine shop with my block,  and they laughed!!  They said it's never "ready to go".. They had to rebalance everything,  cut the crank, add Malory to balance it,  it's production shit..  Everything has to go to the machine shop.  You can spend 4k on a pair of brodix ready to go cylinder heads and bet money they'll need to see the machine shop to square up the valve job and the decks, cuz again production stuff.. People that bitch probably buy and slam together without making sure it's right.. 👍

your friendly local v-drive owner

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aquaholic72

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« Reply #8 on: December 05, 2017, 02:01:21 AM »
And food for thought in parts picking,  what ended up wounding that 496 was a comp cams double roller timing chain set.  The cam gear sheared teeth off and processed metal through the engine,  wasn't bad but it had to come apart.  Called comp and they said we've never heard of that happening before!  Talked to a bunch of drag racers tho that were familiar with the problem!  I've only ran billet timing sets since then!  Hope that all helps. 😅👌

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bobjthomson

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« Reply #9 on: December 05, 2017, 02:22:11 AM »
Thanks brother v drive owner lol , I know I will have to get everything machined, itís the correct thing to do , sure u can bolt it up as soon as u get it but some ppl just donít get it .


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aquaholic72

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« Reply #10 on: December 05, 2017, 02:33:42 AM »
And those are the people that talk shit!  Scat and eagle are great company's for the budget, along with factory gm forged!  I'm assuming your playing with a
.30 over 454?  Stay away from anything procomp!!!! And  You also don't need a 2000$$$ dragon slayer crankshaft for a budget build to make good hp.... Lol

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« Last Edit: December 05, 2017, 02:35:53 AM by aquaholic72 »
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bobjthomson

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« Reply #11 on: December 05, 2017, 02:42:53 AM »
I know I donít want to drop $2k on just the bottom end I just want it done right , as far as I know the old set up lasted 15 years and I want it to last the same , I have a total budget for the whole motor , new heads , gaskets , tooling work etc etc . Wanted all natural aspiration and not stroked . And all this done before next season . But if not , then will go down a different road with the motor and Hull . All in all I just want to get back on the water , drink beer and hang out with good ppl


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aquaholic72

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« Reply #12 on: December 05, 2017, 03:00:47 AM »
OK..  So the crank is.   .20 under,  does it need to be cut?  Is it rough? If so Cut the sob. .30 , they make bearings that size for a reason.  Hone it, ring it, bearing it,    have alil head work done,  I saw you have oval ports on it.  What ovals?  We can make it a better long block for 2 k easy!! 

your friendly local v-drive owner

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aquaholic72

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« Reply #13 on: December 05, 2017, 03:16:59 AM »
I'm assuming again it wasn't hurt when you pulled the engine out?

your friendly local v-drive owner

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bobjthomson

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« Reply #14 on: December 05, 2017, 03:30:22 AM »
Psi oil pressure when warm . As for the crank itís good , no scoring on the journals and the rod bearings look good . Wanted new aluminum heads on it to help it breath better . Just concerned about the crank being .20 under as I have seen them let go . Last thing I need is that lol


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bobjthomson

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« Reply #15 on: December 05, 2017, 03:32:11 AM »
Stupid I pad , No the motor was not hurt , ran great, comp test read 130psi all round and oil pressure was 55-65 psi when warm


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bobjthomson

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« Reply #16 on: December 05, 2017, 03:32:38 AM »
Just tired in my book


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bobjthomson

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« Reply #17 on: December 05, 2017, 03:35:45 AM »
As u can see on the block on the upper left the freeze plug breached and was pissing water .


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aquaholic72

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« Reply #18 on: December 05, 2017, 03:40:14 AM »
I wouldn't worry about a 20 under crank but that's just me . sounds like fresh small parts .fresh pump ,Polish and bearings and the proper oil... Lol seems like you have a basic rebuild ahead of you..  The head thing is gonna be your voodoo!!  But remember,  aluminum heads are gonna change weights in the boat,  not sure how your boat handles,  cuz it's a shallow v v-drive.  Maybe means nothing..  But I'm fighting weight in my flatty trying to make it works properly..

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aquaholic72

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« Reply #19 on: December 05, 2017, 04:05:22 AM »
I'm thinking, for me ,this winter,, a big change in iron cylinder heads, a slide of my engine way farther forward and a change in the fuel I run may fix my issues!!!  😅😅

your friendly local v-drive owner

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aquaholic72

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« Reply #20 on: December 05, 2017, 04:51:19 AM »
Crazy I was shunned from responding,,  but I'm what you got!!  Sorry Bob..  The Facebook deal has killed this site..  You really only get us non face Book people that keep up with this app..  cuz we like the O.G...  I'm sure eventually we'll never know about the events cuz you'll have to be a Facebook whore to know about them!!  I guess when your pants get to big you have to wear them!! 

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bobjthomson

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« Reply #21 on: December 05, 2017, 04:51:58 AM »
My hull is heavy and I think I would benefit from shedding some weight lol . But when I get this figured out , going to start a blower motor from scratch and take my time building it , already got a 4bolt main block to start with . As for the oil , I use brad penn 50w , love the stuff . Have Tom rebuilding my hall craft v-drive and I am rebuilding the trans . Getting new flush fit gas tanks and prepping all the rigging for paint . Then in 2019 doing the whole hull in new gel .



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aquaholic72

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« Reply #22 on: December 05, 2017, 05:04:26 AM »
You know what you're doing Bob!!  You are just trying to involve the group,  or what's left of it..  Lol..  I get it  😎😎

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« Reply #23 on: December 05, 2017, 05:16:22 AM »
I wouldn't worry about a .20 cut crank imo.
I got a  461 na  deal  10.5-1 and a .30 gm crank  , speed pro pistons, 049 heads,
She spins 6200-6400  haven't had any thing that makes me worry about it. And it's the original 2 bolt block the boat came with in 1980.

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« Reply #24 on: December 05, 2017, 06:09:37 AM »
Vdrive and Chevy?! Man, you MUST be on a budget!!!! Lol!

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