byrd07

trying to find steel or castiron heads for 4.0
seems like nobody ever thoght to use anythn but alumi for the 4.0...wud have helpd the reviews and t/c mods alot..
any help wud be apreciated thanx

Buickman

Since aluminum dissipates heat better, that's what all manufacturers are going to these days. You can run higher compression without knock (and that means more power) and it lightens the front of the car, (better handling and gas mileage) I know the 4.0 is famous for blowing the head gaskets when under extra pressure, but maybe with the new V6s Ford has now, we can just swap in the 2012 V6 and gain a quick 100 hp over the old 4.0?????

From

http://www.moranav6racing.com/catego...?CategoryID=32


Heavy Duty Cylinder Heads
Application: 4.0L OHV engines only
1990-2000
Also available 4.0L OHC engines 2000-2010 inquire

Brand new heavy duty cylinder heads. The intake and exhaust runners can be ported much larger than the original heads.

As is(stock,bare, small or large chamber) $480.00 CAD. per set

Porting, over-sized stainless steel valves, heavy duty springs, retainers, locks available- Inquire for pricing.

also available-brand new repalcements heads, with valves, springs, retainers, locks (small or big chanber) ready to bolt on. $800. CAD. per set

All stages of heads require a $200.00 core/replacement charge

Stage #1: heads are total rebuilt (with all hardware installed incl. 3 angle valve job) plus match ported and lightly polished around the intake/exhaust ports. OHV $600.00 CAD. per set

SOHC $700.00 CAD. per set

STAGE #2:
ported, bowl work, 3 angle valve job:OHV $750.00 CAD.per set

SOHC $900.00 per set

STAGE #3:
With the purchase of these heads, our best street porting job, larger replacement intake valves, heavy duty springs OHV $1,600.00 per set

SOHC $2,200. CAD. per set

JimC

Never heard that before - very few that I know of have blown a head gasket. I had one blow, but that was before I ran nitrous or the supercharger and while the car was under warranty. Other than mine, none of the other 4.0 owners I know have blown a head gasket.

And as far as blowing them under pressure -- I ran a 75 shot of nitrous on this car for two seasons. Then I pulled the nitrous and put the Xcharger on it at 90,000 miles with about 12 lbs of boost. Today I have 197,700 miles on this engine and it still runs great. No head gasket problems.