oldzy

Just wondering if anyone has run a Comp Cam roller like the XR262HR (42-413-9) or similar and opinions. I will be running a basically stock 350 engine/exhaust w/duals, with 3.42 gears and aiming for ~9:5.1 CR.

Footnote #5 @ http://www.compcams.com/Company/CC/c...csid=1182&sb=2 of this cam says the valve springs 'require machining on cylinder heads'. What does that mean exactly? I am considering a roller cam like this, the Harland Sharp roller rockers (pedestal mount most likely to avoid head machining and less height clearance issues), but don't understand what the footnote #5 is talking about.

507OLDS

Some Oldsmobile heads have shallow spring pockets,and some have deeper spring pockets.You won't know if or how much to machine until you have the valves mocked in the head,and the installed height of the spring is determined.

Warhead

X2 what Brian said.
Earlier #5 heads will usually set up around 1.700" after the valve job, hence the disclaimer.
Your Number 7a heads should be near 1.800", once the valve rotators get replaced with real retainers. There is more room for springs with these heads, and that is what they are gearing toward.

Have your machinist measure first.

Jim

oldzy

Just bumping to see if anyone has used a hyd. roller cam with similar specs to the XR262HR above. thx

oldzy

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