Lumpy Cam Selection

1677 Views 8 Replies 5 Participants Last post by 68Malibu Blown 406, Nov 28, 1999

RACER70

Discussion Starter · Nov 28, 1999

Help
I would like some input on a camshaft
I have called crane and the fella was more than nice, I am not sure if I was satisfied with his recomendations.
I want a noticeable lump at idle, however I want all my vacum accessorys to work (power disc brakes) I want to use stock diameter valve springs and a stock converter
going into 66 ElCamino 350 cid Edelbrock intake (do not know model) Holly 650 w/vacum secondaries & headers Everything else is bone stock.
Thanks in advance for any input
Jeff Palazzolo
St Louis MO

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68Malibu Blown 406

· #4 · Nov 28, 1999

For some extra lump without having to put in a pro stock like duration number, try selecting a camshaft in the 204 - 214 range @.050 with a lobe separation angle in the 110 or 112 range. The tight LSA will allow for some overlap at idle, causing the idle to be a bit rougher than the same cam with a 114 LSA. With the modest duration numbers listed, you will still have good low speed torque, and midrange will be excellent as well.

HTH

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68Malibu Blown 406

· #9 · Nov 28, 1999

both duration and lobe sep make the idle rougher for the same reason, the overlap gets longer. If you put in a large duration cam with a wide LSA then it will idle rough and not have any torque because the intake valve closes too late on the compression stroke. If you put in a small cam with a tight LSA then the idle will be rough, but the mid range torque will stay about the same because the intake valve closes sooner and builds more cylinder pressure.

HTH

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