Messages

76

Maintenance / Re: Power Valves

« on: October 16, 2020, 02:24:05 PM »

Hi everyone,
 Thanks for the info you all have provided. My mistake last night (perhaps one to many Bud's), The removed valves are slotted not drilled and both are 8.5. I had to get the magnifier out to verify. Hopefully the picture attached; it shows 2 and 4 window 6.5 valves. I've been researching for a couple hrs now reading threads, articles etc. Steve is correct with 6.5 primary and 8.5 secondary from the factory. This was apparently done as the engineers feared there may be a lean droop during the transition from primary onto the secondary's. The 4 window valves as near as I can tell are termed "Quick Response Hi Flow valves." They are most often refenced when "Alcohol" is used for the primary fuel source. They are also slightly taller than the 2 slot valves.
 I'm thinking to return the carb back to stock configuration of valves; 6.5 2 slot for primary and 8.5 2 slot for secondary. Any thoughts are very much appreciated! And whoever was in this carb last time double stacked the PV gaskets on both!

Hank     

77

Maintenance / Power Valves

« on: October 15, 2020, 11:42:46 PM »

Hi all,

I'm in process of rebuilding the Holley 4053 on the Camaro. I am to the point of installing new power valves. The ones removed are marked 6.5 and I wasn't having any running issues so am planning on installing the same rating however the renew kit came with four marked 6.5. Two have 2 slots and two have 4 slots. The ones removed have 2 holes each primary and secondary. I'm assuming the 4 slot valve supplies twice the fuel as the 2 slot valve and therefore should be installed on the secondary side, or is 2 slots good on both sides? The Z is a weekend warrior and isn't driven daily but does know where the straight line country roads are. I do need to satisfy my need for speed every now and again :-)

Thanks in advance for the help,

Hank

78

Maintenance / Re: 396 L34 hard to start when hot

« on: October 11, 2020, 12:29:28 AM »

  Just curious, What is your timing at now?

Henry

79

Maintenance / Re: 396 L34 hard to start when hot

« on: October 08, 2020, 01:39:35 AM »

Hello, I had the same experience with my 327 in a 1968 Camaro. For sure it was not stock; had angle plug heads, Offenhauser 360 manifold, Holley 950 three barrel, 11-1 pistons and dual point ignition. The engine liked a lot of initial timing. I don't remember the settings from back then. But one way I knew to much timing was set was hard starting when hot. My friend at the time was driving a 1967 tri-power 400ci GTO. His did the same thing when to much initial was set. GM products at least the old ones anyway like lots of timing to run, just not in the start sequence. At the time it was explained to me that to much initial is firing the fuel mixture to soon impeding the start process. Once the engine is running no issues. Good luck in your troubleshooting!

Henry   

80

Maintenance / Re: Alternate Valve Lash Adjustment Procedure

« on: August 27, 2020, 09:01:57 PM »

Thank you so much for the responses. I will proceed as noted in the alternate procedure as now I'm feeling more comfortable with it. to my knowledge the engine is 100% stock so the procedure should be acceptable. Guess I'll know once I have the covers off and can look for sure.

best regards,

Hank

81

Maintenance / Alternate Valve Lash Adjustment Procedure

« on: August 09, 2020, 12:04:46 AM »

 
Hello everyone,

New to this forum. i recently acquired a 1969 Z28 Camaro 100% stock. I've read the procedure posted by John Hinckley and Duke Williams and am just curious. Has anyone actually adjusted to .026"? Mine aren't making noise but I have the need to bring everything up to date, You all know...oil change everywhere front to back and give her some TLC.

Thanks for any incite you all can provide!

Henry