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I read the riot act to the valve vendor today and made it clear I expected to have a commitment on the date when the replacemnt parts would be at my home by the end of the day and the date really needs to be no more than 2 weeks.

We'll see how that works out.......

If they are in California and you need a hand, let me know.

Art

The suppliers is, I'll keep your quite generous offer in my.

Yesterday I found a ferrea part number that would be a very good substitute but its 29mm not 28.5 so the exhaust seats would need to be opened up a little.....29 is actually a better size as I'm a tiny bit low on exhaust flow. I asked for pricing and availability for 24 of them.

Last night Victor and I installed the intakes on 7-12 head. This is the head I have the exhaust valves for but without a firm ship date commitment I'm not sure its worth bothering to assemble them.....I may to keep busy and just stop at installing the head until I know what's happening with the valves.

I need to do something about velocity stacks....I could set the heads in place and work on sorting that out I guess.

You guys might enjoy tis video....no need for silly cams and timing chains anymore:

https://youtu.be/S3cFfM3r510

So I decided to true that the replacement valves will arrive and I assembled the 7-12 head, set the lash and put it on the engine. Then I said to mtself....I'm going to do a leak-down. Iknow nothing is seated but just so I know......and all the exhaust valves are leaking very badly. So pretty much a wasted weeked of work ending wiht a great big WFT??????????

I broke the head bolts lose and will pull the head back off next time I'm in the shop. I decide not to recut the exhaust seatsto fix the ID that was a touch small because the valve were sitting on the seats, not dead center but in an acceptable spot....so way are they leaking? I'll make a plate to seal 1 cylinder so I can leak-deak the valves on the bench and find an answer. I've seen fresh valves leak a little when the seat are cut with a profilt cutter because there is a tiny bit of chatter, but that's a LITTLE and it goes away in the fist 500 miles...this was acting like bent valves with now cams installed there is no way anyhting changed from assembly so it was bad right at assembly so something I did wrong...very strange. I'm getting to not enjoy mysteries........

This.......hopefully. I've seen it several times too, but the leakdown for me was much larger than a LITTLE. I disassembled, lapped them in and that helped a LOT.

Did you leakdown the water jackets?

Maybe. Have you seen like 15-20% leakage?

My first stop was going to be blue everythign and a quick lap to see if there's cotact everywhere....it would be great it that fixed the problem I hate to lap much because it can knock off the sharp edges that help grab and shear the fuel droplets.


In the heads? YESSSSS! The water jackets in the heads are sealed.

What I have not done is test the block.....but Iknow there was no water in the pan so there are no big leaks

I remember 20-25% on one of my Lexus V8's that we had just broken in on the engine dyno with a 4bbl carb in lieu of EFI.

I was sorely PO'd and asked my buddy (the guy who did the heads) if he had lapped the valves, and he admitted he'd only cut the seats but didn't lap the valves. So we pulled the heads, lapped them in and the leakdown dropped to 5%.

p.s. Glad to hear the water jackets are holding pressure this time

Well Ok then....fingers cross that maybe it's just that.

Good news from the valve supplier...they say the valves shipped today 3 day air so I'll have them wed/Thur.

i also ordered a refill for my shim kit as I needed smaller shims size after re-cutting the intake seats. Hopefully I have enough of everything now.....and hopefully lapping as John suggests fixes the leaks.