Why did my rockers break? 6 cylinder Options

[David Stowers]

Hi all,
All 3 exhaust rockers broke on one side (4,5,6) when I started my engine for the first rime after cam and rocker re grind.
What’s the likely cause here folks?
Thank you

[brant]

I've been told in the past that some year of T pistons do not have adequate valve pocket that would match an E piston

don't know if that is true for your motor model

but since it was all on one bank.. really points to that cam timing for that bank

[porschetub]

I've been told in the past that some year of T pistons do not have adequate valve pocket that would match an E piston

don't know if that is true for your motor model

but since it was all on one bank.. really points to that cam timing for that bank

I seem to think i read the same thing ,there is a reasonable increase in lift with the "E" cam over the "T" cam however shouldn't be an issue .
I'am presuming this is a original 2.0L 914/6 motor ,issue here is the 'E' cam will only make more @ the top end with higher RPM (6500) and the 2.0 and 2.2L motors made 5800 rpm due to non-counterweighted crank.
The rockers I think in this era were cast and designed to break with valve to piston contact,this was meant to prevent bent valves and it appears on an over rev or contact that's what they do,think on a race motor it may be a less than happy outcome
however (IMG:style_emoticons/default/sad.gif) .
(IMG:style_emoticons/default/agree.gif) with the comments on bad cam timing on that bank but then i also think about a collapsed chain tensioner also ...maybe,i have chain safer collars on my tensioners.
This must be an awful result for the OP.