307 olds in an 80 firenza

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307 olds in an 80 firenza

Postby 80firenza » Mon Apr 08, 2019 1:21 pm

Can anyone tell me what motor mounts I would need to drop my 307 olds motor into the 80 firenza ? It currently has the Buick v 6 in it with a turbo 350 trans all stock . Thanks
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Re: 307 olds in an 80 firenza

Postby HI WINDING MONZA » Mon Apr 08, 2019 2:15 pm

Don't know if it has been done yet, maybe someone else will chime in.

Pontiac, Buick, Cadillac, Mopar , even a Ford 4 cylinder have been done by others here, but don't remember a Oldsmobile anything. :crazy:

Doug in P.R. 8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
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Re: 307 olds in an 80 firenza

Postby 80firenza » Mon Apr 08, 2019 5:56 pm

well ill be dammed!! i guess ill be the first one? i cant imagine an olds motor not going in an oldsmobile :D
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Re: 307 olds in an 80 firenza

Postby Fastmax32168 » Tue Apr 09, 2019 7:17 am

If I was to go to all the effort to put an olds engine in my olds, it seems like a lot of work for not much improvement to go with a 307. The motor makes barely more hp than your 3.8 does now. Any olds Motor, all the way up to a 455 and everything in between will bolt to the same mounts and adaptations you are going to need to make that 307 work. Bigger is better. JMHO
Roy
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Re: 307 olds in an 80 firenza

Postby 80firenza » Tue Apr 09, 2019 8:47 am

Yes fastmax I agree but I already have a nice running 307 olds I’m taking out of my 80 cutlass (built 455 is going in it)and I had no luck selling the 307 . The v6 is a lazy 110 hp at best so the 307 with about 170hp as it sits should be a noticeable improvement .my goal here is to spend very little to make a fun car .
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Re: 307 olds in an 80 firenza

Postby Fastmax32168 » Tue Apr 09, 2019 11:34 am

Just put the 455 straight into the firenza, then you only have to pull off one swap! LOL
Roy
77 Monza Monster Mirage!
94 Corvette Convertible LT-1 500+ HP
83 Malibu Wagon 383 EFI "The Longroof"
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And A Gaggle of Motorcycles
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Re: 307 olds in an 80 firenza

Postby HI WINDING MONZA » Tue Apr 09, 2019 12:58 pm

350 Diesel block punched out and strokedwith aluminum heads and intake would be nice.

Doug in P.R.8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 109k miles
1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 150k miles
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Re: 307 olds in an 80 firenza

Postby Smiley » Tue Apr 09, 2019 2:39 pm

Large hammer, sawzall and a welder.
length is the main problem with the Olds V8 it’s 1.75” longer than a SBC with a short water pump.
you may have to move the radiator forward into the core support, fab the motor mounts, offset the motor to clear the steering shaft, notch the oil pan and clearance the firewall.
The air cleaner may not clear the stock hood.
fab your own exhaust
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Re: 307 olds in an 80 firenza

Postby 80firenza » Tue Apr 09, 2019 5:31 pm

Smiley wrote:Large hammer, sawzall and a welder.
length is the main problem with the Olds V8 it’s 1.75” longer than a SBC with a short water pump.
you may have to move the radiator forward into the core support, fab the motor mounts, offset the motor to clear the steering shaft, notch the oil pan and clearance the firewall.
The air cleaner may not clear the stock hood.
fab your own exhaust

is that all? anybody want to buy a firenza :D i guess just take it one step at a time .Roy you got me thinking lol
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Re: 307 olds in an 80 firenza

Postby 80firenza » Wed Apr 17, 2019 7:55 pm

After getting to know these h bodies a little I’m going to leave things alone for now there is simply too many mods I want to deal with. It’s clear now why people don’t drop olds v8s in these things , for me it’s all or nothing and don’t have the time for all right now . Thanks for the input
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Re: 307 olds in an 80 firenza

Postby HI WINDING MONZA » Fri Apr 19, 2019 7:57 am

Giving up that easy? When I did my Cadillac swap, there was only 2 attempted, #1 was a Vega with 500 that was done as drag car and was abandoned do to being too squirrely, #2 Todd ( 454Spyder) on here tried it on a Monza and gave up , and I tried it and completed it and had a successful run with it for many years till I sold it to move down here.

Anything can be done if you have determination!

Doug in P.R.8)
My Old Cadillac Powered Monza Still Lives...........now on its 5th owner!..........Somewhere ?

The 90's just keep rollin' along........
1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 109k miles
1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 150k miles
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Re: 307 olds in an 80 firenza

Postby 80firenza » Mon Apr 22, 2019 6:24 am

my hat goes of to you doug for a job well done i dont give up easy but im working on 3 other things now maybe ill revisit this down the road
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Re: 307 olds in an 80 firenza

Postby cammerjeff » Mon Apr 22, 2019 12:36 pm

The longer length of the Olds Small Block probably explains why Olds never installed the 260 V8 in Starfire's. I always thought it would have been a natural fit, and keep the brand loyalty going. Pontiac was never really interested in selling V8 Sunbirds, that is why they never considered the 301 V8 for them. I think each division having there own V8 in there version of the H-body would have helped.
Jeff R

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Re: 307 olds in an 80 firenza

Postby Smiley » Mon Apr 22, 2019 1:00 pm

you could freshen up the V6. valve job, rings,slightly bigger cam, headers and maybe a new carb and intake.
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Re: 307 olds in an 80 firenza

Postby 80firenza » Fri May 17, 2019 9:08 pm

Smiley wrote:you could freshen up the V6. valve job, rings,slightly bigger cam, headers and maybe a new carb and intake.

ive been doing alot of research on this and could definitely get alot more out of the v6.
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