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#1 |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Im Pissed Off!
ok, her is the deal. i have a 1970 c10 tha originally had a 307ci in it. since the motor was tired and had no compression on 2 cylinders i decided to go bigblock. i purchased a 1994 454ci that came out of an 2500 p/u. it was tbi so i purchased an eddie mani and carb and bought an electric fuel pump because the block was fuel enjected. so i put the engine together and find out that the flywheel is to large for the tranny to fit. so i swapped it out with the small block flywheel (its a TH350). as i was droppin the motor in with small block mounts like the guy at performance checkers told me, i notice that the tranny needs to be moved at least 6 inches or more back for the mounts to be able to bolt up the chassis. im pissed because the guy at checkers told me that it was gonna bolt right it and it looks like its not. so what do i do? is there any custom mounts to use? tranny mods? here is a pic so u can understand better
![]() Last edited by combustion; 02-24-2007 at 10:00 PM. |
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#2 |
Registered User
Join Date: Apr 2004
Location: Covington,Ga
Posts: 453
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Re: Im Pissed Off!
No idea, but I'm sure somebody will jump in and help you out. Good luck!!!
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72 C-10 |
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#3 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,553
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Re: Im Pissed Off!
Well first off, you cannot use a small block flywheel on a 454 bcuz of the balancing. The 454 is externally balanced and the small block internally (sans 400sb). Second what you will need is the big block frame stands, which set the engine back 1'' from the small block position. Not quite sure about the 6'' deal you are talking about.
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#4 |
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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Re: Im Pissed Off!
there are
6 cyl engine towers sbc engine towers bbc engine towers for these trucks.. i also think they used a high hump floor pan on the big block trucks if memory serves there are also different radiator shrouds needed for different engine combos. the automatic trans cross members has to be moved with these different engine combos.. thus the different drive shafts needed.. the guy at checkers a ![]() check the FAQ section all of these mods have been done many times here. hope this helps..your pal mark ![]() |
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#5 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Re: Im Pissed Off!
Just move the tranny crossmember back to where it needs to be (assuming it's an auto tranny). They just bolt in and the frame is straight for days under the cab.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#6 | |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
Quote:
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#7 | |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
Quote:
"They just bolt in and the frame is straight for days under the cab""" ??????? |
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#8 | |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
Quote:
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#9 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Im Pissed Off!
Rule #1 don’t rely on what somebody at checker, AutoZone etc. say. Always get another opinion especially if you are going to make a big purchase.
But you found us, and there’s a ton of information here. Welcome from New Mexico! Mark, I see you have a new avatar….can I have your old one??lol
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
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#10 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Re: Im Pissed Off!
Just move the crossmember to where you need it and drill the holes where you need them.
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#11 |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
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#12 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Re: Im Pissed Off!
You're gonna need a different driveshaft if you're going from sbc to bbc anyways. Luckily it's cheaper to shorten one than to lengthen it. I don't see how it could be 6" out, there's not that much difference in the mounts. BTW what kind of tranny do you have that the flywheel wouldn't work? As far as I know the bellhousing patterns are all the same, so I can't picture the flywheel being the reason the tranny won't fit.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#13 |
Registered User
Join Date: Apr 2005
Location: Albert Lea, MN
Posts: 15
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Re: Im Pissed Off!
get a 153 tooth flywheel for a 454, you cannot use one from a 350...period, it will prove disastrous
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#14 | |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
Quote:
its a th350 like i said. the bbc flywheel is just to big for my sbc starter to go in. unless i need to get the one it came with. but the 454 flywheel is too big. the holes for the torque converter bolts are too separated. |
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#15 |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
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#16 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Im Pissed Off!
is the flywheel physicly too big to fit in the tranny bellhousing...
![]() I suspect it is the latter. Big blocks always came with a TH400, the TH400 has a larget converter with a larger bolt pattern on it. Here's a little trick i did on my caddy/TH350 deal... get a converter for a TH400, and install it in the TH350. It'll work fine. |
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#17 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Im Pissed Off!
wow... 2 responces while I was typing.
Get the Th400 converter, and a starter to work with the big block flywheel. |
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#18 |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
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#19 |
Registered User
Join Date: Dec 2003
Location: here
Posts: 5,789
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Re: Im Pissed Off!
Did you change trannys too? Ive had a 350 & a 396 in my 69 & it was a drop in deal, but I didnt change anything on the trans. Ive always gone by the rule that a big block will bolt up anywhere a small block will. Might not clear everything as far as valve covers & acc but the block bolt locations are the same...
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#20 | |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
Quote:
well. when i put the engine in it sits foward way too much thus not allowing the engine mounts to go in. some people in here were saying to move the tranny x member back so the motor mounts can bolt into place. im using the small block motor mounts right now on the bigblock. butlike i was asking. what car came with a 153 tooth flywheel for a bigblock? r do i have to get it custom. sorry im full of questions, but i need to get this done asap |
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#21 |
Registered User
Join Date: Feb 2007
Location: chandler
Posts: 331
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Re: Im Pissed Off!
bump
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#22 |
Registered User
Join Date: Dec 2006
Location: POWNAL VERMONT
Posts: 343
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Re: Im Pissed Off!
454 big blocks and400 smallblocks are externally balanced so you need to use a flywheel off of one of those two engines to be correct if you dont you will mess your motor up badly when you get the flywheel get a starter for the same thing and it will work flywheels come in two sizes 153 tooth and 168 tooth and the starter can be ordered for either you just need to specify how many teeth you want they both WILL fit
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1972 c-20 chevy 500 caddy/4.10posi / 1972 3/4 ton gmc 350 4x4/4.10posi front&rear ![]() ![]() ![]() Last edited by 1bad chevy; 02-25-2007 at 07:01 AM. |
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#23 |
F.A.S.T. president
![]() Join Date: Sep 2003
Location: Florida
Posts: 1,883
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Re: Im Pissed Off!
Like others have already said you can’t use a SB flexplate on a BB without 0 balancing the engine for it. My suggestion is to call TCI at 1-888-776-9824 tell them the engine and transmission you’re using and have them recommend a flexplate (not flywheel) with the correct bolt pattern.
If they don’t make one try B&M both of the companies are top notch transmission and accessories manufactures As far as positions go there are two sets of holes for the motor mounts one more forward then the other, are you in the most forward position? You will also need the BB engine stand and factory ones are not cheap if you can find them. This is what I would use if I where making the conversion http://www.nwautofab.com/shop/xcart/...9&cat=3&page=1
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F.A.S.T. President and Founder Fabricators for the Advancement of Sawsall Technology "A fear of the Sawsall is a sign of retarded sexual and emotional maturity." ~Sigmund Freud, "General Introduction to Psychoanalysis" |
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#24 |
Chevy Forever
Join Date: Jun 2005
Location: Dalzell SC
Posts: 314
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Re: Im Pissed Off!
If you go to checkers (or junk yard) and ask for a starter for the 1994 chevy then you will be able to use the flywheel that came with the engine. the starter from the 350 won't work the mounting flange is diffrent. but the tranny will bolt up to the big block. 99.9% sure all tranny bell housing's are the same for chevy's now some one will point out where I am wrong on this I hope but the flywheel and torque converter should bolt together also but you can do what longhorn suggested if they don't.
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My first love 1971 C20 Hugger orange Getting face lift and heart transplant .30 402 BB /TH400 and GV Wifes car 1969 Chevelle SS 396 325hp/TH400 Factroy A/C Automatic w/ Floor shift console. restored. |
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#25 |
Registered User
Join Date: Jun 2002
Location: central pa
Posts: 1,525
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Re: Im Pissed Off!
First things first. Go to GM dealer and get a FLEXPLATE (2 sizes12 3/4";153 tooth and 14":168 tooth) for the 454 with dual bolt pattern(10 3/4" and 11 1/2" torque converter). Next get rid of the 350 motor mounts and get towers and mounts for a big block. Then get a starter for a Big Block.
As it sits in the engine compartment how close to the firewall is the engine now? Make sure of the year the engine is when you get your FLEXPLATE as the 454 around early '90's were mark 4 and gen 5/6 and the balance is different.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne |
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