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Any negatives of putting a 240 head on a 300?

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huntnfish08
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Location: Wisconsin

Any negatives of putting a 240 head on a 300?

Post #1 by huntnfish08 » Tue Sep 03, 2019 11:12 pm

So smaller combustion chambers raises compression and gives quick and easy upgrade to a 300.
Does it change anything in a negative way?
Like when or where torque is made?
Fuel mileage?
The overall level of performance that can be achieved with porting/polishing?
Performance available by changing valves?

Just curious as I would like to know before I swap a 240 head on my 300.

Thanks
Adam
Adam White

1978 F150, 300cid, NP435/205, 4x4
Clifford intake, 2150 1.08" 2bbl, comp 1.76:1 rockers, EFI exhaust manifolds.

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THE FRENCHTOWN FLYER
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Re: Any negatives of putting a 240 head on a 300?

Post #2 by THE FRENCHTOWN FLYER » Wed Sep 04, 2019 8:28 am

If it is going on your '78 avatar truck there will be very little down side aside from the borderline timing implications of more compression. Later engines may have different style rocker arm and EFI heads have a more efficient chamber.
The ports are the same as a 300 and respond well to port work, as does the addition of bigger valves.
Excessive valve guide wear is common on these hi-mileage heads.

I just finished up a similar build with a 240 head on a 300.
Go for it.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

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