afr's

8

89lx

Forum Member
just wondering if anyone on here is running afr 185's on a 302. was wondering roughly wat size cam i could go with without having to notch the pistons for valve clerance. thx.
 
I know someone who is, I havent personally.

Cam depends on what intake your gunna use, what headers, rpm capability of the short block\valve train, power expectations, compression, car weight, auto vrs manual, etc...
 
i just wanna make sure im not gonna have any valve clearance issues when i slap the 185's on. i wanna try to avoid notching the pistons.
 
its a 306 with speed-pro forged pistons. im not sure if they are flat top or what. i just know that info from when i bought the car.
 
best advice I could give ya is put a head on and use a weak spring and do a clearance test to see what you have to work with..

I think the ballpark figure is max .540 lift with a big valve not sure thought.. somone should pop and and correct me if I'm wrong. but it depends on duration as well.
 
.540 eh i was thinking i would have to go even smaller then that. i was figureing ball park 492ish like a e cam.
 
i know its a little off topic but why does everybody grab the e cam as there first choice?? the b cam makes 15 more horse than the e and it has better ptv clearance. you can run the b cam and put a 1.7 rocker on it and come out with .510 lift and be golden.
 
if you were wondering here is the formula to calculate the difference between a 1.6 and 1.7 rocker:

You could either divide the lift with the 1.6 rockers by 1.6 = lobe lift

Now multiply that lobe lift by 1.7 = new theoretical lift with the 1.7 rockers.

Take a lift of .520" with 1.6 = .520/1.6 = .325 lobe lift
Now.... .325 * 1.7 = .5525" or .553" rounded off.

OR...... divide 1.7/1.6 = 1.0625 (meaning 1.7 = 6.25% more lift) and multiply the lift with the 1.6 rockers by 1.0625.... .520 * 1.0625 = .5525" or .553"
 
lift doesn't matter so much as duration. You would more than likely be fine with an ecam or bcam. But if your not gonna do it right don't even bother you MUST check PTV clearance.
 
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