440 head advice

Dave-R · Post by **Dave-R** » Sun Jul 05, 09 4:42 pm

mo_malone wrote:
nick.stratta wrote:Here's a pic of the head
Top pic of head is to show difference between a good sated valve and the bottom shows the valve with no seat left, valve is right back into head.

So these are two different heads, the one with black valves is from a different motor.

What? Like we don't know what a stock valve looks like? Even I remember those from way back when.

Anonymous · Post by **Anonymous** » Sun Jul 05, 09 5:52 pm

Could of been a snowball effect..........valve spring got weak causing lifter to hold Ex valve open , Ex valve got hot & receeded into head.

Think i'd be checking spring pressures to see if this were the problem , even though the heads are gonna be scrapped it would be buggin me.

Mick70RR · Post by **Mick70RR** » Sun Jul 05, 09 8:13 pm

The 915 heads were fitted with 1.74" exhaust valves when used in performance engines. For non performance engines they were 1.6" I think. If you have the smaller valves you could cut the seats and fit ther larger ones.

Anonymous · Post by **Anonymous** » Sun Jul 05, 09 10:31 pm

Dave wrote:
mo_malone wrote:
nick.stratta wrote:Here's a pic of the head
Top pic of head is to show difference between a good sated valve and the bottom shows the valve with no seat left, valve is right back into head.

So these are two different heads, the one with black valves is from a different motor.
What? Like we don't know what a stock valve looks like? Even I remember those from way back when.

Sorry Dave

, you missunderstood, i took the pics!, and was just pointing out that they were 2 different heads, it was just to show Nick his valves compared to a valve from a head i have myself.