Did 85 blazers come with tachs?

[Lostroad44]

I just picked up a 85 blazer and was wondering whether or not any came from the factory with tachs? if not, are there any year gage clusters with tachs that will work?

thanks

 

[b454rat]

Supposedly factory tachs went out in 81 or 82, and those styles are hard to find. Everytime I go to a junkyard I look for them, and only have ever had 1. I had 8 of the 70s style. They will work, the font is the only thing that is different. Get an overlay and other than the color nobody will know.

 

[diesel4me]

The 80's C60's had factory tachs but aren't exactly plentiful--and the speedometer cable on thde larger series may be the "old" style screw on one rather than the clip on style too,another bummer..

 

[Lostroad44]

Thanks for the information. I notice you have a 305 in one of your vehicles. I have a 305 in my blazer. I was thinking of swaping out for a 350 tbi engine that I have but when I tuned it up it seemed to run pretty good but was low on power- just based on its rating. I would hate to swap it out if I could at least get the performance of the 350tbi out of it for less than a grand. How does yours run and did you do anything to increase its performance

 

[diesel4me]

My 79 C10 had a 305 (sold it about 3 years ago though),I got the 305 from an '86 G10 van...I ditched the computer distributor that had the EST module with 5 pins on it and no vacuum advance for an older HEI with a vacuum advance,and put an Edelbrock 600 CFM carb on it using an adapter to the stock Q-jet manifold..no other real mods,I think a 500 CFM carb would have been better,it seemed to smother it when I florred it..never did play with the jetting..

It was no ball of fire,it only had 145 HP stock,but it was a big improvement over the 250 six it had before...I liked the fact it got 18 mpg most of the time and still had decenmt acceleration..

A 305 can be built up to get more HP with a better cam,intake,carb,etc--but it'll never be a 350 either,though it can be improved a lot..If I remember right a 305 has the same stroke as a 350,but smaller bore..like they say,there's no replacement for displacement..but a 305 will pull better at low RPM than a 283,307 or 327 will,those are shirter stroke high revving engines..

 

[KansasTwister]

My 79 C10 had a 305 (sold it about 3 years ago though),I got the 305 from an '86 G10 van...I ditched the computer distributor that had the EST module with 5 pins on it and no vacuum advance for an older HEI with a vacuum advance,and put an Edelbrock 600 CFM carb on it using an adapter to the stock Q-jet manifold..no other real mods,I think a 500 CFM carb would have been better,it seemed to smother it when I florred it..never did play with the jetting..

It was no ball of fire,it only had 145 HP stock,but it was a big improvement over the 250 six it had before...I liked the fact it got 18 mpg most of the time and still had decenmt acceleration..

A 305 can be built up to get more HP with a better cam,intake,carb,etc--but it'll never be a 350 either,though it can be improved a lot..If I remember right a 305 has the same stroke as a 350,but smaller bore..like they say,there's no replacement for displacement..but a 305 will pull better at low RPM than a 283,307 or 327 will,those are shirter stroke high revving engines..

but once a 302 or 327 grabs pavement shes gone




There are a couple mid 80s tach clusters on ebay right now. You can tell them apart from the 70s clusters easily.