1.6 vs 1.7 rockers

[coupecop]

I just have a question way will be the deference betwen the 1.6 and 1.7 rocker in power how much more power one from the other

 

[85_SS_302_Coupe]

Why cause potential valve train strain with a higher ratio rocker when you can get the same effect from the right cam?

Stick with 1.6s and get a higher lift cam.


What will the power difference be? I don't recall how .1 lift equates to exactly how much more lift, but compare it to basically just having a bit more lift on your cam, and that's how much more you'll make. Basically unless you get 1.7s super super cheap and can't afford a new cam, IMO they're a waste of time. UNLESS you're really old school and just doing a super low dollar build, and then you can get 1.7 stamped steel rockers off of a 460 and get a little more out of a stock cam.

 

[v8only]

1.7's AND a cam can likely result in piston/valve clearance issues.

stick with the 1.6's as mentioned that way you can run a proper cam. wish to hell I would have done my homework b4 bolting on my 1.7's.

 

[Sicarius428]

Supposidly within a couple HP of each other. Not worth the risk of breakage or hitting your piston, just get a more aggressive cam.
Kevin

 

[smallstang393]

If you take your total valve lift and divide it buy 1.6 then take your total and multiply it buy 1.7 and get your new lift with 1.7's

Example .498/1.6=311.25 then 311.25 x 1.7=529.125

 

[Foxfan88]

i got a good deal on a B-cam for cheap. it has low lift, .480 with 1.6s

the b-cam has pretty nice duration for a street mustang, 224* @.050 on both sides

i traded some 1.6s i had for some 1.7s, now the lift on the b- cam is around .510 - .512, helps it out a little bit.

 

[ronburgundy]

it all depends on your cam grind and your flow chart for your heads. some heads flow no better at 550 lift than at 500. stick with what your cam grinder/manufacturer recommends.

 

[85_SS_302_Coupe]

i got a good deal on a B-cam for cheap. it has low lift, .480 with 1.6s

the b-cam has pretty nice duration for a street mustang, 224* @.050 on both sides

i traded some 1.6s i had for some 1.7s, now the lift on the b- cam is around .510 - .512, helps it out a little bit.

See, as far as lift goes, that brings you right on par with an F303.

 

[coupecop]

Do you think it would me a good gain if I put the 1.7 rokers on with the heads and cam that I have . I have the cast iron gt 40 and a e 303.

 

[thumper460]

I agree with ya'll !! IF you have the 1.7 rockers and a small lift cam, and want to raise the lift on your cam... then install the 1.7. IF you are GOING to buy the 1.7's cause "everyone uses them", then I say NO!! Cost is an issue... 250-325 for a set of 1.7s and gain 10 HP on the cam, vs 200.00 for a Camshaft that will give 35-40 HP!! See where I am going... dont Bandied the valve train!! On the tests run in a few mags.. the HP increase wa less than 10 HP!!!

Just me........................................

Thumper