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Cam advice....

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Cam advice....
blazinchuck Offline
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#21
01-26-2011, 10:33 AM
yeah, but i would think mild upgrades wont push the motor over the edge. i would really like to do something also. like a better cam in the 306 and a better one in the 5.0
77 built 306,Trickflow Cam/Alum Heads/dome pistons/10:1comp,nv3550,duff long arms,3.5" lift,family cage,protofab rear bumper,twin sticked, and 35KM2'sG.D.I.
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blazinchuck Offline
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#22
01-26-2011, 10:38 AM
one other thought...Aaron, whatcha think about advancing the cam?? i have the cam spec sheet at home and it list advancing it so many degrees. right now, its straight up
77 built 306,Trickflow Cam/Alum Heads/dome pistons/10:1comp,nv3550,duff long arms,3.5" lift,family cage,protofab rear bumper,twin sticked, and 35KM2'sG.D.I.
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bucketobolts Offline
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#23
01-26-2011, 10:54 AM
Advancing cam time moves the torque range down about 200 rpm for each degree and advancing moves the torque up about 200 rpm for each degree, roughly speaking. When I first bought my '93 LX back in the day, I installed the 1.7 rockers and retarded the cam time 4*. This allowed me to pull 4.10 gears through the 1/8th mile in 3rd gear. But for the labor involved, I believe it is more worth while to swap the cam rather than advancing the stock.


My personal preference is a long flat torque curve. The FRPP alphabet cams are proven and are still good grinds. And remember the XE270HR grind has about .544" of lift. Which may require fly cutting for piston clearance.
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chuzie Offline
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#24
01-26-2011, 12:03 PM
I am definitely leaning towards the E303 now.
'77 351w- Explorer EFI, 4R70W, 4-link, lockers, 4.56, 35" MT/Rs with a severe rock addiction.Confusedmokin:
Roads? Where we're going, we don't need roads.

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Timstrk Offline
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#25
01-26-2011, 10:58 PM
How much piston machining do you have to do to clear the valves with over .5" of lift. I thought the small blocks were pretty close from there on up.

Tim
74 Bronco Ranger halfcab w/toys: lockers f&r, wristed arm, C4, D20, hyd assist steering, 37"MTRs, warm 302. Capability, that's what I'm talkin' bout.
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chuzie Offline
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#26
01-27-2011, 12:02 AM
The E303 is designed to work with a stocker though the real HP gain is not experienced until the heads are replaced.
'77 351w- Explorer EFI, 4R70W, 4-link, lockers, 4.56, 35" MT/Rs with a severe rock addiction.Confusedmokin:
Roads? Where we're going, we don't need roads.

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bucketobolts Offline
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#27
01-27-2011, 10:16 AM
From my experiences stock heads with stock size valves are well clearance with the stock pistons. Only valve clearance problems would be with E5 & E6 heads on a '85-86 block. Theses had smaller chambers and flattop pistons.

It would also be wise to upgrade the valve springs and timing chain while your in the motor. Also remember these #'s were calculated using 10:1 compression and 4.030 bore.
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blazinchuck Offline
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#28
01-31-2011, 10:24 PM
ok Aaron, what does our 306 come up with on your program?

302 bored .30 over, roller motor,1.6 roller rockers,trick flow alum heads,alum intake-port match to intake. has a 600 holley w/vac sec. but it has drilled out jets,larger squirters.L&L nickle long tube headers. i attached the cam spec sheet


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77 built 306,Trickflow Cam/Alum Heads/dome pistons/10:1comp,nv3550,duff long arms,3.5" lift,family cage,protofab rear bumper,twin sticked, and 35KM2'sG.D.I.
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bucketobolts Offline
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#29
02-01-2011, 09:42 AM
Do you know what the compression is?
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blazinchuck Offline
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#30
02-01-2011, 09:52 AM
yeah, sorry...10:1
77 built 306,Trickflow Cam/Alum Heads/dome pistons/10:1comp,nv3550,duff long arms,3.5" lift,family cage,protofab rear bumper,twin sticked, and 35KM2'sG.D.I.
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