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roller rockers...question.
what is the overall benefit in using 1.5 intake rockers with 1.6 exhaust rockers?? it seems like it might be a simple answer to me... more efficient disposal of exhaust gases rather than having both valves be equal in lift..? someone please explain this to me, and how much of a benefit (if any) it would be.
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Why are you mixing?
What engine, head, cam, intake... Stuff do you have? Why not put 1.6 on both? Just a question. |
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What engine, head, cam, intake... Stuff do you have? Why not put 1.6 on both? Just a question.>> well first of all, im not mixing. im wondering why someone WOULD mix them. i've seen plenty of sets online that have them mismatched like this. no claims of performance gains...just sold like it was a regular package to suit your needs. so i was wondering... if in the event someone chose to mix them, what kind of characteristics would it yield? better performance maybe? (how?) its just something i ran across that made me question its purpose. also, im running an sbc 357 (.040 over), 2.02/1.6 heads /w screw in studs, guidplates, bronze valve guides, 5 angle valve job, and 72cc chamber. yielding about 9.4:1 compression total. comp cams XE268, Edelbrock Air gap rpm /w 600cfm 4 barrel. aftermarket HEI with MSD ignition module and 55,000V coil, newest accel 8mm high heat wires. ideal shifting point is about 5,500rpm and should make around 320-335hp at the wheels, according to software dyno calculations. so yea, any ideas on any possible benefits of mixing intake/exhaust ratios? |
Sagacious:
The reason for mixing the ratios is to "HELP" a lazy port design. In the past Fords were notorious for poor exhaust ports flow on the small block 289/302 and it became worse with the 351 (similar port size) consequently by effectively changing the lift and duration of the exhaust valve, it helped the gas flow considerably, but more recently dual pattern cams and redesigned ports have become the norm. Rick |
greater lif for the exhaust. just run a bigger cam.
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