307 to 350 olds

Richie84cutlass

Richie84cutlass

Not-quite-so-new-guy
Jan 7, 2019
8
1
3
#1
From what i read my 307 to 350 olds into my 1984 olds cutlass should be pretty straight forward swap correct me if im wrong...i just have a few last things i wondering about will all the brackets to ac alternator and power stearing bolt up the same? Will the 70 350 rocket heads have the same bolt pattern for the brackets the Motor is still in shop being finished so no way for me to check until last second and i do have the original 350 brackets and one more question what will i need to do to connect motor to th200 trans and will the trans hold up very long????
 
MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
4,597
2,868
113
Des Moines, Iowa
#2
th200c wont last long behind a v8. a th350 drops right in.
a 350 olds will bolt right in place of the 350, the fasteners on the 307 might be metric, everything on the 350 will be SAE.
 
Richie84cutlass

Richie84cutlass

Not-quite-so-new-guy
Jan 7, 2019
8
1
3
#3
Do i need to change crossmember to put in th350 thrans?
 
spicercars

spicercars

Apprentice
Jan 7, 2019
99
50
18
Saginaw MN
#6
Yes g force is the way to go. Great fit and lots of room for pipes.
 
olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,088
1,915
113
Melville,Saskatchewan
#7
A dual hump crossmember is not 100% neccessary for dual exhaust, below is all 2.5". The factory exhaust is horrible, you want at least 2.25" dual exhaust and headers help too. Everything single thing swaps over, although port size is different on 85 and later intake manifolds and the tubular exhaust manifolds they came with are restrictive junk. I would do a mild cam swap, stock is 196/200 .400/.402, pathetic. The timing chain, nylon coated cam gear falls into the oil pump pick up, not good, change it. Change all the lower gaskets, get rid of the rope rear main seal, 3 neoprene rear main seals fit it, AMC 6cyl, AMC 360 and Ford 292 which Felpro knows sells as an Olds replacement part. The 200C to TH350 is also an easy swap, basically add a vacuum modulator line. Good luck.
20190412_074531-jpg.111083
 
Daca214

Daca214

Master Mechanic
Dec 1, 2017
416
453
63
Jupiter, FL
#8
From what i read my 307 to 350 olds into my 1984 olds cutlass should be pretty straight forward swap correct me if im wrong...i just have a few last things i wondering about will all the brackets to ac alternator and power stearing bolt up the same? Will the 70 350 rocket heads have the same bolt pattern for the brackets the Motor is still in shop being finished so no way for me to check until last second and i do have the original 350 brackets and one more question what will i need to do to connect motor to th200 trans and will the trans hold up very long????
i am currently doing the same and so far, everything bolts right up with no issues. the only minor difference was my valve covers were 5 hole on my 307 and they are 10 hole on my 350. i just filled the rest with right stuff.
 

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