Has Anyone noticed much power increase with 1.7 rockers?

Jay5_o · Aug 27, 2004

I was thining of picking a set of cranes 1.7 rockers , but just wondering if the price is justified for the increase in power if any?
any improvements in track time?

88stangmangt · Aug 27, 2004

i would go with 1.6 the 1.7's are a bit much with stock springs but you could do it you might notice a little difference....................

Jay5_o · Aug 27, 2004

the 1.6 is stock in 87-93 5.0's... are they not ?

seijirou · Aug 27, 2004

Jay5_o said:
the 1.6 is stock in 87-93 5.0's... are they not ?

Yeah but their about as precision as hand held pencil sharpener. The ratio can vary anywhere from 1.5 to 1.7 per rocker arm. some good aftermarket rockers you know are true to their claim.

Gearbanger 101 · Aug 27, 2004

I'd say that if you're planning to stick with the stock cam and you've got other intake and exhaust mods already, go ahead and grab the 1.7rr's along with a better set of springs. But it’s going to do little for a stock engine, so make it one of your last mods.

I've got them on mine (1.7's), but i've also got ported heads, intake, full exhaust, pulleys, CAI, gears, etc, etc. Don't expect huge power gains either way, but they're worth a few ponies along with other mods. Probably in the 5-10fwhp range.

If you're planning on swapping out the cam, the stick with the 1.6rr’s and concentrate on cam selection to provide any added lift you might want. 1.7rr's have been shown to place added stress on valve train (increased side load and friction on valve guides and valve stems), especially when the horsepower and RPM potential starts to climb.

How's that....clear as mud?

Mattys5Oh · Aug 27, 2004

When I installed mine the SOTP dyno said I gained alot. I was actually very impressed. They are 1.72's and fit under the VC and the stock springs seem to be handling it well.

Matt

Gearbanger 101 · Aug 27, 2004

Mattys5Oh said:
When I installed mine the SOTP dyno said I gained alot. I was actually very impressed. They are 1.72's and fit under the VC and the stock springs seem to be handling it well.

Matt

The SOTP dyno can be a little bias at times. Do you think you actually gained any real power, or is it because you mentally you know you’ve added an aftermarket part and think that you should have. The nice thing about them is their accuracy compared to the stockers and since they’re roller, they cut back on friction and allow the engine to rev a little more freely, but I doubt any real power was achieved. That’s assuming that you’re still running a mainly stock set up. As for the valve springs….changing them isn’t mandatory, but some have experience a little float at the upper end of the RPM limits. That’s why I upgraded mine.

N8Miller · Aug 27, 2004

some guy on here added 1.7 rockers and picked up like 8-10 hp on the dyno. if you want, ill find the thread and then link you to it.

super302 · Aug 27, 2004

I'm in the same situation, i got a set in the garage(for free ), just wondering if i should bother installing them??

Has Anyone noticed much power increase with 1.7 rockers?

Jay5_o

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88stangmangt

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Jay5_o

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seijirou

Gearbanger 101

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I need NOS....make it 2 of the big ones

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Has Anyone noticed much power increase with 1.7 rockers?

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