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**aotte1** · 01-29-2018, 02:03 AM

Jeff,
The rearend end gear is 3.73, with new Eaton posi. With the trans having around a .75 4th gear ratio, it does not have a lot of rpm on the interstate.

Going with a new motor, this one has to much cam to be fun driving slower around town, with the LY6 option transmission. The transmission gear ratios and spacing just make it hard with motor that needs lots of RPMs on the low end. Replacing cam in this motor with Comp Cams Hyd roller 205/204 duration, 4.89/ 5.23 lift, 110 centerline, installed at 106 degrees. It will initially go in the 65' short bed, with a turbo 400 switch pitch trans.

Putting in a GM create motor. What a difference driving slower ( not WOT), fun again. It has no high top end RPMs, however, for cruising it is great. Some gas in second breaks the tires loose. Still breaking in the motor. The motor itself is very quite, 3000 rpm and very little mechanical noise, just mellow exhaust music. Great throttle response, and really fun to drive.

The photos show progress on install. Will get some with install complete. Initial thinking on carb, is really nice. It is a Quick Fuel, ???, will get the number. Very easy to tune.

Les

01-29-2018, 02:03 AM	#502
aotte1 Senior Member Join Date: Oct 2013 Location: lousiville Ky Posts: 2,637	Re: 1986 Chevy C10 SWB Step Side Jeff, The rearend end gear is 3.73, with new Eaton posi. With the trans having around a .75 4th gear ratio, it does not have a lot of rpm on the interstate. Going with a new motor, this one has to much cam to be fun driving slower around town, with the LY6 option transmission. The transmission gear ratios and spacing just make it hard with motor that needs lots of RPMs on the low end. Replacing cam in this motor with Comp Cams Hyd roller 205/204 duration, 4.89/ 5.23 lift, 110 centerline, installed at 106 degrees. It will initially go in the 65' short bed, with a turbo 400 switch pitch trans. Putting in a GM create motor. What a difference driving slower ( not WOT), fun again. It has no high top end RPMs, however, for cruising it is great. Some gas in second breaks the tires loose. Still breaking in the motor. The motor itself is very quite, 3000 rpm and very little mechanical noise, just mellow exhaust music. Great throttle response, and really fun to drive. The photos show progress on install. Will get some with install complete. Initial thinking on carb, is really nice. It is a Quick Fuel, ???, will get the number. Very easy to tune. Les Attached Images Last edited by aotte1; 01-29-2018 at 02:30 AM.