My 305 impressed me!!!!

[hunterguy86]

So my 305 impressed me today. I towed a 78 fullsize bronco on a trailer through the texas hill country with my 86 k5. my little boat anchor towed it pretty well for what it is. I wasnt gonna win any speed races but I got er dun. Im really impressed on how well the little 305 did. Just had to share.

 

[Big GMC truck]

My 305, edelbrock intake and rv cam, never impresses me from a stop. Although, it has pretty decenct midrange power. Is your 305 stock?

 

[RustBuket]

My 305, edelbrock intake and rv cam, never impresses me from a stop. Although, it has pretty decenct midrange power. Is your 305 stock?

I agree completely. When I had my 81 with 33's and 3.08s my 305 wasn't winning anything off the line but it always pulled good from midrange to top end.

 

[hunterguy86]

My 305 is all stock, still w/ the stock qjet. Im running 31's and have 3.73 gears. Only mod to the k5 is a 4 inch susp. lift. The 700R4's 1st gear helps. I just leave it in drive instead of overdrive when towing or in town.

 

[potionmaker]

Was the q'jet stock on the '86 blazer with the 305? How many cfm's?

 

[dyeager535]

Q-jet was the stock 4 barrel on pretty much all GM vehicle engines. Few exceptions early on, but that was about it.

All Q-jets are physically capable of flowing 750 or 795/800CFM as cast, but typically limited on the secondary side to less than that. Primaries are 250 or 300CC's. (thats where the CFM difference was)

The TRUCK 305 Q-jets I've inspected have been 800's. (both '83's that I looked at) Monte Carlos, even the SS, had 750 CFM variants, while the 307 Olds of the same vintage was 800CFM.