Help with Timing, Vacuum and Backfire - 289c.i.

Phillyfanfrombirth · 12-01-2005, 06:12 PM

I'm trying to figure out how you fit a 1.94/1.6 valve set up into a stock 1966 head with any kind of lift... that must be one heck of a squeeze. I have those valves in a set of Windsor Jr. heads, but those chambers make the stock heads look tiny.

That said, any possibility of some valves sticking open? or the rocker arms torqued too tight?

"ARP bolts and studs"... I would take this to mean that you've pulled the stock rocker studs and you've replaced them with screw in studs? If not, check your studs with a straight edge to make sure none have dislodged... If any look out of whack (I had one sticking up about 1/4" one time) they will have to be pulled and replaced.

agazzo · 12-01-2005, 06:57 PM

the 1.94/1.6 valves where fitted with a really good machinist (the best in Peru) who use to work with the Peruvian Airforce and was an airplane engine mechanic. It is a really good job! including bronze guides and a 3 angle valve job.
I had double checked the valves adjustment in both ways, the cold one, assuring that each valve is in the correct part of the lobe, and the hod way, making a mess; in both cases 1/2 turn from zero lach.
Do you have a good way to check if a valve sticks open?
About the studs, you are right the same machinist that do the head job has replaced them.
Thanks for your help.

agazzo · 12-01-2005, 06:58 PM

One more thing, Sorry about my bad english.

12-01-2005, 06:12 PM	#1
Phillyfanfrombirth Registered Member Join Date: Dec 2004 Location: South Central PA Posts: 358	Re: Help with Timing, Vacuum and Backfire - 289c.i. I'm trying to figure out how you fit a 1.94/1.6 valve set up into a stock 1966 head with any kind of lift... that must be one heck of a squeeze. I have those valves in a set of Windsor Jr. heads, but those chambers make the stock heads look tiny. That said, any possibility of some valves sticking open? or the rocker arms torqued too tight? "ARP bolts and studs"... I would take this to mean that you've pulled the stock rocker studs and you've replaced them with screw in studs? If not, check your studs with a straight edge to make sure none have dislodged... If any look out of whack (I had one sticking up about 1/4" one time) they will have to be pulled and replaced.

12-01-2005, 06:57 PM	#2
agazzo Registered Member Join Date: Jan 2000 Location: LIMA, PERU Posts: 15	Re: Help with Timing, Vacuum and Backfire - 289c.i. the 1.94/1.6 valves where fitted with a really good machinist (the best in Peru) who use to work with the Peruvian Airforce and was an airplane engine mechanic. It is a really good job! including bronze guides and a 3 angle valve job. I had double checked the valves adjustment in both ways, the cold one, assuring that each valve is in the correct part of the lobe, and the hod way, making a mess; in both cases 1/2 turn from zero lach. Do you have a good way to check if a valve sticks open? About the studs, you are right the same machinist that do the head job has replaced them. Thanks for your help.

12-01-2005, 06:58 PM	#3
agazzo Registered Member Join Date: Jan 2000 Location: LIMA, PERU Posts: 15	Re: Help with Timing, Vacuum and Backfire - 289c.i. One more thing, Sorry about my bad english.

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