Poor mpg

[Rusty Nail]

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More importantly, what spark plugs would YOU use?

Hay look who The Shopcat drug in!

AND he done set a wicked clever trap that Ye ol BrownK10 the new guy done fell plumb in.

I done seen wat u did rite thurr.

Whattup Loc?

I mean Sir.
Good to see you, Sir!

All bein a ninja poppin in from the shadows...that's how you found The Shopcat huh?

 

[80BrownK10]

If you look in any repair manual, .35 gap is for 250 CID and anything that is running breaker points. With an HEI it reccomends .45, but after building dozens of engines and running them in Moab and the drag strip I've found out that .40 with an HEI works the best. I run autolite 24 at the track and 26 offroad......but hey, I tip my hat since you apparently have more experience than me.

I have seen a spec for .35 for HD use for HEI. But your correct the spec for normal HEI is .45.

I really don't think there will be much difference in my motor. But go with what you said.

 

[80BrownK10]

I have seen a spec for .35 for HD use for HEI. But your correct the spec for normal HEI is .45.

I really don't think there will be much difference in my motor. But go with what you said.

Gap is also .035 .... I noticed that after I posted.

 

[SquareRoot]

I use Accel shorty header plugs. They provide the clearance I need to keep from roasting my plug boots.

No idea what " heat range they is". They screwed in...motor runs good.

Dats all I knows.

 

[FireTruck1984]

350HO 700r4 9 inch ford

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diff 3.5 gears.Rebuilt quadrajet getting 16.8mpg driving like a granny around town.6mpg driven hard.

Love it ! Wheels, stance, bed rails.. very cool