dropped valve?

what would cause a valve to drop? my brother was reving it but not hard maybe 3500rpm's. next thing bam bam bam. shut it off pull heads and dropped an exhaust valve. the valve head broke off. trying to figure why? .030 460 solid roller cam(low .600 lift) iron cj heads performer rpm intake 850 holley. any ideas? block is junk. it has a big ol hole in it. thanks

two piece valves do that all the time.... just the heads break off....


Randy

you could probly fix the block.sorry about your luck.

X2 on what Randy said

here what happen to me when the valve head pops off this is the piston out of my 351c with 2.19 1.72 valves took the block out and 1 head going down the road turning 2500 rpms

69F100 wrote:X2 on what Randy said

here what happen to me when the valve head pops off this is the piston out of my 351c with 2.19 1.72 valves took the block out and 1 head going down the road turning 2500 rpms

Yikes!!! That looks painfull.

Bill

valves. i know they were ss valves. are they 2 piece? block is wasted half the cylinder wall is gone. my next ? is a buddy said we can have his back up motor. hyper pistons, .030, balanced, stock rods w/ arp bolts, c460 hydraulic cam. what would are compression be with 72cc heads? the pistons are sealed power h535 flat tops w 2 valve reliefs. would it be to high? we just want to get back to the track. thanks

personally before I use Hyper u junktics I would build a new short block..... but thats your choice...


Randy

money is tight rite now and we can get it for free and just put are top end on it.

the question is how bad are your CJ heads? are they fixable?


Randy

hell yea!,free stuff always works.what if you drop another valve in this free short block?is it still free?i'd want to know before i used it.

Is the rotating assembly except for the one piston not any good? if it is I would find another block replace piston an fix heads. Just my .02c.

could you not sleeve the block?i'v done it but did'nt have half gone.

im pretty sure the block is junk. the heads dont look that bad. im sure it will need a new seat and obviosly a new intake and exhaust valve. the chamber doesnt look that bad either. ive seen alot worse that were able to be fixed plus i allready have a set of dove heads that are ported w/ big valves. thanks

Hopefully they are 1 piece and not the 2 piece.....


Randy

the ones in the doves are ferrera(spell check). thanks

I hope you know that there are three different series or "grades" of Ferrea stainless steel valves. The PN is laser etched in the stem up at the tip of the valve. Let us know what the number is please.

Charlie

Wow i sure hope my milodon megaflo valves i just got for my c8 heads were a good choice.