Cammed L30

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SlamTheMan

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The 059 and 520 heads flow very similarly, increasing all the way to 0.500" lift. Can use the same Comp 787 retainer, 0.050" offset locks and LS beehive combination as the L31 head to gain lift capacity.

I would probably go with a Lingenfelter 74211 in that truck. It is the lightest truck that engine came in, you have a looser converter and decent gearing. Keep in mind if you go with those wheels, you will loose a lot of what the engine modifications will gain you from the additional weight. I am not a huge fan of a dual pattern cam in a 305, but not many single patterns exist that are EFI friendly in a 305 without a lot of tuning. The 74211 has a 211/219 @ 0.050 duration and it is on a 112 LSA. It will still make decent vacuum to keep your power brakes happy. With 20* more duration at 0.050" on the intake lobe, it will move the powerband up a fair bit but given your S10 converter should stall about 2,400 rpm behind a L30 if it is running well, it will jump right into the powerband quickly. The GM ZZ4 cam is also a very similar grind at 208/221 @ 0.050 on a 112 LSA and probably could not tell a difference between the two from the driver seat. The Summit 8801 is also right there in the mix spec wise and some seem to love those Summit branded cams. In a 305 I would get a Cloyes 9-1157 single roller chain with the 3 way adjustable crank sproket and advance the cam 4* with a cam of that size. 305 needs to close the intake valve a bit sooner than a 350 to keep its low-speed torque, but needs a fair chunk of duration to get decent flow through its smaller intake valves and smaller bores.
Okay thanks for the help! I do love the Summit cams myself ran the 8802 in the L31 before. What’s your thoughts on rocker arms 1.5 or 1.6?
 

L31MaxExpress

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Okay thanks for the help! I do love the Summit cams myself ran the 8802 in the L31 before. What’s your thoughts on rocker arms 1.5 or 1.6?
I would say the more lift the better, but given the pressed-in studs, stick with 1.5s for a cam like the 74211, ZZ4 or 8801. They all get you up in that over 0.500 lift range with a 1.5 rocker. Staying under ~0.530" lift, I have yet to have a pressed in stud pull out of a Vortec head using a LS6 or Pac1218 spring at a near spec installed height. The spare parts L30 I built 15 years ago that was in my 83 G20 for a while for daily driving while I built a 383 for it, then in my brothers 80 C10, then found its way into the 1980 Corvette was inadvertantly twisted over 7K numerous times and somehow survived, pressed studs, beehives, hyper pistons, 2 bolt mains, cast crank and all. That 305 had a Crane sourced GM 845 cam in it.
 
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L31MaxExpress

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You cannot get the GM 845 cam new any longer, but it was this grind. At 214/222 @ 0.050, 0.488/0.509 lift, 112 LSA and 107 ICL it was right in there as well with the other 3 cams. It had a solid idle at about 700 rpm, good low-midrange torque and just kept pulling on the top-end with the L30 heads, especially with a big Q-Jet 4bbl carb on it.

 

sykobob

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You cannot get the GM 845 cam new any longer, but it was this grind. At 214/222 @ 0.050, 0.488/0.509 lift, 112 LSA and 107 ICL it was right in there as well with the other 3 cams. It had a solid idle at about 700 rpm, good low-midrange torque and just kept pulling on the top-end with the L30 heads, especially with a big Q-Jet 4bbl carb on it.

What do you think about the LT4 hot cam in a 305?
 

SlamTheMan

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Had a L30 I built with a Lunati HE 268 that was 218/218 @ 0.050 on a 110 LSA flat tappet. It had a noticeable idle and tugged my 99 Tahoe around better than the stock 350 ever would have.
Think I’ll be going with the 268 also local speed shop is having a closing sell near me has a 268HE & 268 Voodoo so hopefully it’s still in stock when I have time to stop by. Thanks for your help & info.
 
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