[4dblnkldude]

Originally Posted by Goatracer1

Changing cam, heads etc. is only going to move your power range upward. You will get the biggest bang for the buck by changing the rear end ratio. Steve 25 had the right idea by recommending 3.23 0r 3.55 gears.

This is exactly what I did with my 70 Esprit. (original car with 120k) I did 3.23 posi, bumped timing up to 10 deg advanced and rebuilt the carb. Literally like driving a different car. I think theres is a tad more in it too.

[OE Espo]

Originally Posted by 4dblnkldude

This is exactly what I did with my 70 Esprit. (original car with 120k) I did 3.23 posi, bumped timing up to 10 deg advanced and rebuilt the carb. Literally like driving a different car. I think theres is a tad more in it too.

So you just rebuilt the 2BBL carb? I was thinking a well tuned quadrajet would improve power and fuel economy both, and while i was that far, upgrade by raising compression with heads. Have 140s or 13s that I currently have. orig heads i believe are 11s on the car now which i believe are like 8:1

[NeighborsComplaint]

Rear gear change, intake and 4 bbl, headers and dual exhaust. Leave the internals of that good running engine alone. I did that to a ‘65 Lemans 2 bbl 326. The rear gear ratio change came last. I did the headers and duals first which were the biggest bang for the buck. Made for a snappy little car up to 4000 rpm.

Everyone complains about header leaks but I never had issues. I’ve used copper, aluminum and Remflex and none have leaked. I always check the header flanges with a straight edge and grind any high spots or weld spatter before mounting. Using 1-5/8” headers, they aren’t that tough to tighten properly and retorque after the first heat-cool down cycle.

[4dblnkldude]

Originally Posted by OE Espo

So you just rebuilt the 2BBL carb? I was thinking a well tuned quadrajet would improve power and fuel economy both, and while i was that far, upgrade by raising compression with heads. Have 140s or 13s that I currently have. orig heads i believe are 11s on the car now which i believe are like 8:1

Yes, I ran a 15.1 in a stock in my 81 TA with a 77 400. That car was originally a turbo car with 3.08's. Not a doubt in my mind the 70 esprit would beat it with the two barrel.