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My 305 impressed me!!!!

hunterguy86

1/2 ton status
Joined
Jan 10, 2005
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Location
San Marcos, Texas
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.
 
My 305, edelbrock intake and rv cam, never impresses me from a stop. Although, it has pretty decenct midrange power. Is your 305 stock?
 
Big GMC truck said:
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.
 
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.
 
Was the q'jet stock on the '86 blazer with the 305? How many cfm's?
 
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.
 
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