? about cam?

[shlagher]

i am getting ready to order a cam springs and pushrods for my vet. but the cam has some choices.. the cam degree is 111 standard or i can get 112..... and the rod length is 7.400 standard or i can get 7.350... can someone tell me what difference this will make.. and why? should i just stay with standard? any info will help. thanks!

[Z1LE]

there are a couple of differences with the lsa on the cam. tight lsa; engine will tend to have decreased idle vacuum, and have an increase in mid to upper rpm power due to more overlap period/ scavenge effect. wider lsa; better idle vacuum, low to mid power improvements. the pushrod length can only be determined once the cam is installed. you should do a mock-up with test springs to see how the rocker travels across the valve tip (you can also use a sharpie on the valve to get you close). if fuel mileage is of any concern, the wider lsa will show a marginal improvement, especially during low speed use. (less dilution of the intake charge) this is somewhat generic info, hope it helps.

[shlagher]

Originally Posted by Z1LE

there are a couple of differences with the lsa on the cam. tight lsa; engine will tend to have decreased idle vacuum, and have an increase in mid to upper rpm power due to more overlap period/ scavenge effect. wider lsa; better idle vacuum, low to mid power improvements. the pushrod length can only be determined once the cam is installed. you should do a mock-up with test springs to see how the rocker travels across the valve tip (you can also use a sharpie on the valve to get you close). if fuel mileage is of any concern, the wider lsa will show a marginal improvement, especially during low speed use. (less dilution of the intake charge) this is somewhat generic info, hope it helps.

thanks for that info man it helps alot!