FrankenVega / FrankenCosworth

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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Wed Aug 09, 2017 5:55 pm

Forgot to mention a dreadful discovery. It seems as though the drivers Cosworth door and the 74 GT passenger door are different in respect to the amount of protrusion at the window sweep edge where the trim mounts by about 1/4 inch. I guess this explains why they asked when I ordered the sweeps, did it have the chrome trim strip in that area or not. Now both doors have been prepped for paint and I know the sweeps I ordered were for the trim type. One more thing to sort out I guess.. Yes, I have both other doors, but, when we decided which two to go with we picked according to the condition having no idea they were different. Yikes.
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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Thu Aug 10, 2017 3:08 pm

Trim the sweeps, skip the lower window trim. Rolled it into the bay set for the Vega and are currently trying to mock up the motor. There are issues with the BG mounts not lining up, We cut the external slave cyl mount from the bellhousing and smoothed it nicely. So, did I miss somewhere in a thread that the stock transmission mount was NOT going to work with this application of the V6 vortec? We're about three inches from having the BG mounts line up with the holes. We had intended to use the stock drive shaft (newly redone) and the torque arm (unmodified). Uhhh...Houston, ...we have a problem..
Haven't quite figured out how to configure the ACE transmission adapter as the illustration is a bit vague and there is no photo of the installation. So, if the transmission mounts in a different place than original, the torque arm and drive shaft and the shifter arms will all have to be modified?...Is this true?
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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Fri Aug 11, 2017 10:43 am

These pics were not correct. Using the original trans mount for the saginaw4-sp. Moved BG mounts forward approx 2 in..we will use one thick spacer plate from the 74 GT mount. This is a 74 GT firewall that we mounted into the 75 Cos. Didn't I read somewhere that this is the large opening to acommodate the Wankel on this firewall?
Last edited by 74_Vega_GT on Mon Aug 14, 2017 5:47 pm, edited 2 times in total.
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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Fri Aug 11, 2017 10:46 am

more....these were bad pics..and wrong as well..
Last edited by 74_Vega_GT on Mon Aug 14, 2017 5:49 pm, edited 1 time in total.
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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Fri Aug 11, 2017 10:49 am

replacing these pics...sorry..
Last edited by 74_Vega_GT on Mon Aug 14, 2017 5:50 pm, edited 1 time in total.
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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Fri Aug 11, 2017 10:52 am

I need to revisit and remove the bad pic i see..right now i gotta go help my bro take out the ill fitting motor...
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Re: FrankenVega / FrankenCosworth

Postby Smiley » Sun Aug 13, 2017 4:24 am

How do the V6 headers fit ?
I would position the motor where the headers fit best, then make or modify the motor mounts,oil pan and trans crossmember as needed.

For the bellhousing use a V8 Monza setup, it uses a 10.5" clutch and the same cable type fork as your Vega but it bolts to a 4.3 V6 or a small block Chevy V8.
this allows you to reuse the stock Vega clutch pedal and cable linkage.
Truck bellhousings usually use 11" clutches so they take up more room at the firewall and the do not use the cable fork linkage.
Most Vega engine swaps will require some firewall massaging with a large hammer for bellhousing area.
zerks can be removed after greasing or newer style inner tie rods have the zerks facing the rear of the car instead of towards the oil pan if you are replacing them.
after you clearance the firewall jack up the trans tailshaft as far as possible and recheck the oil pan clearance, you may still need a modified steel pan.
https://kevkoracing.com/collections/4-3 ... -3l-v6-pan Kevco Racing makes 4.3 pans for one or two piece rear main seal blocks but you would have to call them for a V6 Vega pan.


It looks like the engine needs to go back
have you tried the mounts with the trans and bellhousing removed ?

and there are 2 different heights for factory rubber mounts on a 4.3
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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Mon Aug 14, 2017 6:06 pm

Thanks Smiley, I'll show my mechanic tomorrow thise images. We are not using a cable clutch, we are using a hydraulic throw out bearing.
~..So, using the stock trans mount put the motor forward about 2 inches. This will keep from having to cut the drive shaft(its new stock), or the shifter linkages, or the torque arm. The BG mounts will need a plate to the frame mount redrilled , fabricated and welded. We will use the ones from the 74 GT. The Sanderson shorties will probably NOT work. All 3 pipes on the drivers side are inline with the steering shaft. (Who said these would work?) The header dumps in a nice place, but it wont work. The passenger side header dumps out right at the started solenoid and its not going to work. A stock exhaust manifold off of the 89 vortec from the Astro Van will work on the passenger side. We are looking for a drivers side stock exhaust manifold that dumps like the passenger side.
~ We modified the steel pan off of the 89 Vortec so the holes would line up to the 99 vortec and modified the pan gasket...Does Not contact the steering tie rod end. The oil pan hangs lower than the crossmember, so we will fabricate a steel plate like you see on toyota trucks to shield the pan.
~ .trouble in PhotoShop.
Last edited by 74_Vega_GT on Tue Aug 15, 2017 4:57 pm, edited 1 time in total.
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Re: FrankenVega / FrankenCosworth

Postby Smiley » Tue Aug 15, 2017 12:21 am

With your motor slightly forward you might try a 94-96 S10 Blazer or Bravada driver side manifold.

http://www.ebay.com/itm/1994-S10-BLAZER ... sx&vxp=mtr

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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Tue Aug 15, 2017 10:24 am

Just got back from the bone yard...a 99 s10 Xtreme exhaust manifold works great.
We just fit it...the bung on the drivers side manifold for EGR will have to be cut off and plated or welded up, but its gonna lay closer to the vortec head and avoid the steering shaft. The passenger side will work as is.
Now, I must box up the Sanderson Shorties and prepare for a return or swap for a nice Edelbrock carb. They looked nice, but will not work in the stock 75 engine bay.
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Re: FrankenVega / FrankenCosworth

Postby 74_Vega_GT » Tue Aug 15, 2017 5:13 pm

The stock drivers side exhaust manifold , where the flange bolts on had to be trimmed a bit and we WILL have to "massage" a dent down low in the control arm support closest to the firewall for just a skoshie more clearance for the exhaust flange mount. Using the thick frame mount plates off of the 74 GT with the spacer, because it has the holes already drilled in the proper place with the nut welded where it belongs, we will use thick box steel angled to an "S or a "Z" and fabricate mounts using the "monza V8" mount portion of the BG mount kit. We will not be using the box portion of his mount kit.
IF we were installing a V8, we would have needed them as well as the ACE tranny kit. Since we do not want to cut the drive shaft or the shifter linkages or modify our finished 75 firewall, and cut the torque arm bar, we have no use for them. There were leftover trailing arm bushing steel inserts that we will be using in our V6 motor mount fabrication.
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