rebuilt quadrajet or holley

[Jims86tpisub]

I blocked my EGR off because it made my engine missfire horribly when cold. I used a putty knife blade with silicone on it. Runs like a champ, stock everything but the cam, with timing agt 8 or 10° with 87 octane.

It probably wasn`t the EGR valve that was making it missfire when cold, but possibly the ported vacuum switch used to control it.

[gto109]

the kid i bought my truck off of said that my carb is an edelbrock rebuilt q-jet.  i never messed with it, the thing works great.  I've only looked at it enough to know thats its a q-jet.

[klaussk]

ok im not sure exactly what was wrong with that post. but ill attempt to rephrase it. i dont understand how a bad EGR valve can make a truck run bad. But it can run fine without it.

[Grim 82]

Edit your post and rephrase that immediately.

[Captkaos]

I rephrased it for him and gave him 5 days to read the rules... Thanks for the report.

[Jims86tpisub]

Edit your post and rephrase that immediately.

HUH?

[Grim 82]

That wasn't directed at you Jims86. Capt took care of it and we're back on topic now.

Question though, in the days of leaded gas and no EGR, what kind of compression ratio did those motors usually have compared to the later EGR models?

[gto109]

i have heard of some of the cars runnin as much as 11 to 1 back then i dont know for sure though.  i know a guy that had a road runner with a 340 in it who said that he had rebuilt the engine back in the early 70s and when they took the lead out that he had to redo it becouse the compression was to high.

[Jims86tpisub]

i have heard of some of the cars runnin as much as 11 to 1 back then i dont know for sure though.  i know a guy that had a road runner with a 340 in it who said that he had rebuilt the engine back in the early 70s and when they took the lead out that he had to redo it becouse the compression was to high.

Yup, some as high as 11(maybe higher), some as low as 7.5