Vega 4cyl to turbo 350 bolt pattern

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Vega 4cyl to turbo 350 bolt pattern

Postby freeman » Sat Apr 04, 2020 12:51 am

Would anyone have a diagram of a 4cyl turbo 350 bolt pattern?. I need to make an adapter plate to suit the Toyota v8 hemi engine i,m putting in my Vega.
Thanks Hans In Aus
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby Smiley » Sun Apr 05, 2020 3:30 am

The starter is mounted higher on the Vega 4 cylinder engine than most V8s so check you starter location before making a plate to use a Vega transmission.
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby 283vega » Sun Apr 05, 2020 6:28 am

I would suggest using the standard sbc pattern not the vega one. The vega trans is a little on the weak side. Besides why limit yourself on trans choice.
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby freeman » Mon Apr 06, 2020 7:39 am

Yer thanks guys, i have a trans guy here he said i need to put the extra clutch plates and stuff to bring it up to V8 specs.
I still need a diagram of bolt pattern if anyone has one.
THanks Hans.
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby monzaaddict » Mon Apr 06, 2020 8:35 pm

a t-250 out of a vega is air cooled. a t-350 has lines that allow fluid to be cooled by radiator or a separate cooler.
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby Smiley » Tue Apr 07, 2020 3:01 am

Does the starter bolt to the block on the Toyota V8 ?
What is the flywheel diameter ?
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby freeman » Thu Apr 09, 2020 5:55 am

Ok thanks for the replys, i must have a T 250 because it,s air cooled.
On the starter it bolts to the block and the drive plate is 295 mm in dia.
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby freeman » Thu Apr 09, 2020 5:59 am

After some more thought i might go with a sbc T350
Thanks again for the imput Hans in Aus
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby 283vega » Thu Apr 09, 2020 6:25 am

You might as well make the adapter for the sbc pattern and see if you can get a 200r4 or 700r4 for the overdrive.
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Re: Vega 4cyl to turbo 350 bolt pattern

Postby iowagold » Thu Apr 23, 2020 2:26 pm

wow you have a thm 350 in your vega??
I do too
they are rare only like 200 of them produced in the early 1972 production..
the rest were the 250 trans.. same bolt up.. not even as close on the hp it would handle..
the thm 350 if built right with red eagle clutches and kolene steels they will do 800hp...
watch your tq converter mfg.. spend the bucks for a good one!!

so what all specs do you need??
pm me your direct email addy.
See my vega project at:
http://www.poustusa.com
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1972 Chevrolet Vega GT


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