'73 Chevelle coupe progress

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'73 Chevelle coupe progress

Post by lastcoupe on Sun Aug 09, 2015 5:28 pm








It's been a few years, but I am finally making a little progress on the '73 coupe.  The 427 is built, installed and running.  Doug Thorley headers and Summit racing dual exhaust installed. Rebuilt 350TH transmission with B&M shift kit and 2000 stall converter. I know the trans probably won't live long behind the big block, but it's what I had and this is a very tight budget build so I'm rolling the dice.

Also got the new carpet and front seat covers installed.  I'm happy with the car so far.  I wish I had the money and time to do a full body off resto-mod on the car because it is a VERY straight and clean body (especially being in WV and Ohio it's entire life) with 100% of it's ORIGINAL sheet metal and very little rust. I'd love to know what you all think.  Here are some pictures.
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Re: '73 Chevelle coupe progress

Post by 77mali on Sun Aug 09, 2015 6:26 pm

Looking good!

As far as the Trans, consider a separate cooler just for Trans fluid. A TH350 is built pretty strong, the enemy is overheating the fluid, not necessarily the new motor/converter combo.
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Re: '73 Chevelle coupe progress

Post by knightfan26917 on Mon Aug 10, 2015 6:49 am

Progress is good!


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Re: '73 Chevelle coupe progress

Post by thatfnthing on Mon Aug 10, 2015 8:44 am

Love it! Everyone who knows anything appreciates works-in-progress, they don't have to have the shiniest paint. And the 427 makes it very unusual, which is always a plus in my book.
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Re: '73 Chevelle coupe progress

Post by pila on Mon Aug 10, 2015 11:08 pm

Lookin' good !!  The TH350 is actually a fairly strong transmission, and a shift kit puts more servo pressure on those clutches, which seems to make them hold up better.

Have fun Very Happy

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Re: '73 Chevelle coupe progress

Post by Pontichev327 on Tue Aug 11, 2015 12:57 am

Looks great to me! Is that a dark burgundy color?
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Re: '73 Chevelle coupe progress

Post by lastcoupe on Wed Aug 12, 2015 9:24 pm

Thanks guys. Pontichev327 it is supposedly a dark cherry metallic from Oldsmobile. Previous owner told me it was a 1986 Cutlass color. It is burgandy basically, I hate it, but they did a decent job painting it. As for the transmission, I do have an auxiliary cooler for it, but I sincerely don't think it will withstand the big block's torque. I have a 4L60E as well as a New venture gear 5 speed one of which might find it's way in the car eventually if I decide to keep it. Hopefully I can get it outside and clean it up this weekend. Can't wait to drive it!
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Re: '73 Chevelle coupe progress

Post by clanceman427 on Wed Aug 12, 2015 11:24 pm

I like it! And rust free? That is great! So, what rear gear u running? Is it a street cam in the 427? Like previously mentioned, add a shift kit to the TH350 and you'll love the chirps and it will extend the life ofthe trans with all that power. The corporate 8.5.inch 10.bolt rear should hold up as well IF built correctly. Have fun!
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Re: '73 Chevelle coupe progress

Post by bracketchev1221 on Thu Aug 13, 2015 6:35 am

I wouldn't be afraid of the t-350. The 427 is not a torque monster with its short stroke and a t-350 can be mildly modified and handle 600 hp with no issues. You're probably going to have traction issues long before torque damages the trans. Now if you were trying to dead hook it at the track with slicks, then you may burn up some clutches.
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Re: '73 Chevelle coupe progress

Post by lastcoupe on Thu Aug 13, 2015 12:29 pm

Clanceman427, it does have one little spot of rust about the size of a nickle on the edge of the right inside tail light.  I repaired two spots the size of a quarter in the floor pans while I was replacing the interior.  Other than that the entire car is straight and clean.  I already added a shift kit when I rebuilt the TH350 also red clutches and kevlar band.  The cam is a Comp cams off the shelf grind with 491 lift 268° duration and 110° lobe separation.  The block is bored .060 over and the heads are the mid level 119cc combustion chambers.  The compression ratio is 10.6:1 if I did my calculations right when I ordered the pistons.  I have not even looked at the rear axle or drove the car yet.  I do have a 8.5" locker with 3.73:1 gears and disk brakes if/when the time comes.  Also have an Impala ss rear sway bar and close ratio steering gear for it.


Last edited by lastcoupe on Sun Aug 16, 2015 4:50 pm; edited 1 time in total
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Re: '73 Chevelle coupe progress

Post by lastcoupe on Thu Aug 13, 2015 6:31 pm

Clanceman427, it does have one little spot of rust about the size of a nickle on the edge of the right inside tail light.  I repaired two spots the size of a quarter in the floor pans while I was replacing the interior.  Other than that the entire car is straight and clean.  I already added a shift kit when I rebuilt the TH350 also red clutches and kevlar band.  The cam is a Comp cams off the shelf grind with 491 lift 268° duration and 110° lobe separation.  The block is bored .060 over and the heads are the mid level 119cc combustion chambers.  The compression ratio is 10.6:1 if I did my calculations right when I ordered the pistons.  I have not even looked at the rear axle or drove the car yet.  I do have a 8.5" locker with 3.73:1 gears and disk brakes if/when the time comes.  Also have an Impala ss rear sway bar and close ratio steering gear for it.


Last edited by lastcoupe on Sun Aug 16, 2015 4:51 pm; edited 1 time in total
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Re: '73 Chevelle coupe progress

Post by lastcoupe on Thu Aug 13, 2015 6:33 pm

Sorry for the double post..my phone messed up and promted me to resend.
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Re: '73 Chevelle coupe progress

Post by lastcoupe on Sun Aug 16, 2015 10:58 pm







Got it outside and washed today.  I'm happy with the stance.
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Re: '73 Chevelle coupe progress

Post by thatfnthing on Mon Aug 17, 2015 9:12 am

Agreed, that looks really good!
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Re: '73 Chevelle coupe progress

Post by tropdeprojet on Mon Aug 17, 2015 10:43 am

Nice car!
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Re: '73 Chevelle coupe progress

Post by knightfan26917 on Mon Aug 17, 2015 2:53 pm

Lookin' good!


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Re: '73 Chevelle coupe progress

Post by lastcoupe on Fri Aug 28, 2015 7:25 pm

Thanks guys. I'm bleeding the brakes and should be going down the road soon.
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Re: '73 Chevelle coupe progress

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