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Discussion Starter · #1 ·
Hi all.
Which locks are the correct ones for these retainers and which seals can be used with these springs?

They are fro a set of "290" Big Block heads.

Its -30C at the moment and I am bored so I drug these out to assemble but do not have the locks/seals :confused: .
 

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The locks are 611's for 343 stems or 612's for 375 stems. The 911's are not the best choice for a performance engine. Good for a stock rebuild. The single spring will take just about any type of seal.

Harry P Hunter
 

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Discussion Starter · #3 ·
Thanks.
Now the next question. The retainers I have are supposed to be 748's which should measure 1.5". However when I measure them they are 1.440" and I cannot find that diameter on the comp web site. Any ideas?

The valves are 3/8 "
 

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Discussion Starter · #5 ·
I must be getting senile (No smart cracks:D ).As I looked at the retainers something did not look right so I measured them. They were 1.40 OD and 1.058 ID which did not make sense. So I looked them up and they appear to be a set of Comp 744's which are for a stock big block.

Any way it looks like its time for new retainers and locks. Maybe even springs just to be sure.:confused:
 
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