Need cam suggestions
71 chevelle 3400 lbs guessing
355 9.5:1 compression AFR 195cc street heads 2.05/1.90 Performer RPM air gap 650 or 750 cfm carb have both 700r4 2600 stall 2.73 but 3.73 or 3.90 going in the spring 26" tire Can not afford a roller so solid flat tappet it will be Lunati recommended 30120741 Voodoo series 2600-6800 276/282 241/249 .520/.540 110/106 Comp has 4/7 swap 12-664-47 2400-6800 282 / 290 244 / 252 .520/.540 110 / 106 I ran the comp non 4/7 swap same spec in desktop dyno 2003 did not do as well as Lunati's grinds Open to suggestions will be ran on the street or I would have ran Lunati's oval tight lash 2 30121102 which kicked the most in dyno simulation but for the street not so much 2500-6500 272/280 243/251 .530/.543051 106/102 Open to opinions and suggestions Sent from my SPH-L720 using Tapatalk |
What is the primary use of the car? 241/249 @ .050" seems HUGE for a street driven 355 with a 2600 converter.
IMHO - I would like to see a cam with less overlap to build compression, rather than bleed it off. The lunati cam has 25 degrees of overlap. I bet the DCR sucks with thats camshaft. I would like to see something like a 230/234, on a 112 LSA, 108 or 109 ICL, and .550"-ish lift. I know a SFT cam loses some of the specs through the lash, but I think the modern grinds require less lash... therefore not as much of a loss. Focus on power under the curve instead of peak power. Just my $0.10 worth... |
And forget the 4/7 swap...waste of time, money and effort on a mild street engine.
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Road course protouring auto-x and drive during the summer.
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I have been playing with close to 12 different cams in the desktop dyno program and 106/102 gave the best numbers without falling on its face after 4500 the other cam that looked good is a 108/102 oval track cam also grind 30121101 which is 2000-6500
268/276 239/247 .521/.540 108/102 Sent from my SPH-L720 using Tapatalk |
update ended up with an isky 246/246 @.050 274/274 advertised .534/.534 lift on a 108 love it works great with my setup. I did have to put in a vacuum canister to help with the breaks though.
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Good choice on the solid flat tappet....will out perform a hyd roller every time.
Are your power brakes ok ...perhaps a hydroboost setup. Btw a larger lca will give more vac and have a wider power band but gives up some peak power and torque. |
Single pattern and tight LSA should be very torquey. What's the ICL?
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True ICL 108 I will try to post some pics tonight of the cam change. I ended up paying more for lifter than the cam but here was the parts list for the cam change. Realize this was done in the summer and I found three wiped lobes on the old camshaft. More pics will post what I got.
Ati-917781 harmonic balancer Cloyes 9-3100 timing chain Fel-Pro 1205 intake gasket Fel-Pro tcs45165 timing cover set Lucas 30 break-in oil 5qt Piston stop Summit degree wheel Isky SO202H lifters Lunati 30121101 cam Aem 30-4110 wide band gauge moroso 73800 ultra 40 wire set And some ebay protector boots coolant from the local parts store. |
I also wanted to add I did my homework before buying the cam used Vizard's formula to spec it out
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