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93 Dak
Dodge Dakota
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11/07/2004
21:30:32

Subject: 1.6 vs. 1.7 rr's
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Please excuse this message if you have seen it on other boards, I'm trying to get a bunch of input :)

I'm going to be installing some roller rockers when I do my 408 build.
Currently I have a 604 Competition Cams:lift .512 dur@.050 210, 220 / LSA 112. I know the 1.7's will fit in my MP valve covers but will they have any benefit due to the lift already built into the cam? If so, how (top end, bottom end, etc.)?
Thanks for the help!
James



N56629
Dodge Dakota
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11/07/2004
23:04:37

RE: 1.6 vs. 1.7 rr's
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The 1.7s compensate for lack of cam lift, so if you are going to install a cam, why not get the lift that you want in the first place? It doesn't make a whole lot of sense.



Sneezer
Dodge Dakota
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11/07/2004
23:57:59

RE: 1.6 vs. 1.7 rr's
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1.7s make more sense for a stock cam engine. With the 408 application the 1.6s are going to be a better match.



chris king
Dodge Dakota
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11/08/2004
01:06:40

RE: 1.6 vs. 1.7 rr's
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for more performance advance the camshaft -4 degrees on the chain to get more low end torque, 112 is way to high you want that thing real low 108-109 range and the lift up to .540 range with a 1.7 would help.



N56629
Dodge Dakota
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11/08/2004
07:46:36

RE: 1.6 vs. 1.7 rr's
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It's a whole lot easier and far cheaper to buy the right cam in the first place even if you buy a custom grind.



Science Guy
Dodge Dakota
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11/08/2004
09:39:00

RE: 1.6 vs. 1.7 rr's
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there ya go. get the right cam to begin with and stay with the 1:6's



93 Dak
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11/08/2004
10:12:07

RE: 1.6 vs. 1.7 rr's
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N56629-
Let me clairify before you assume and jump to more conclusions-

I already have the cam, as I have stated, "Currently I have a 604 Competition Cams:lift .512 dur@.050 210, 220 / LSA 112"

I WILL be buying 1.6 or 1.7 rr's

So..it would be much cheaper if I reuse the cam and get 1.6 or 1.7's.

I'll start a new thread regarding cam selection.

Thanks for the input.
James



Science Guy
Dodge Dakota
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11/08/2004
12:09:16

RE: 1.6 vs. 1.7 rr's
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do this. install the 1:6's and do some dyno pulls or run a drag strip et. then swap to the 1:7's and do another pull on the dyno or drag strip strip et. see what happens with each rocker set up. after all, swapping the rockers can be done within 2/3 hours pretty easily. dont forget to check valve/piston clearance with each rocker installation. let us know what happens.



N56629
Dodge Dakota
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11/08/2004
12:53:27

RE: 1.6 vs. 1.7 rr's
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" install the 1:6's and do some dyno pulls or run a drag strip et. then swap to the 1:7's and do another pull on the dyno or drag strip strip et."

LOL! How much do those little rocky thingies cost again? $300-400+?



N56629
Dodge Dakota
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11/08/2004
13:07:06

RE: 1.6 vs. 1.7 rr's
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"Let me clairify before you assume and jump to more conclusions"

I understood you the first time. I would still eBay the cam and buy a different one rather than go with 1.7. That's just my personal choice. That choice would also allow me to go to a different cam later and not have to compensate for the 1.7 rockers, but then again that's just my opinion.

Without knowing all the details of your build, you are asking an awful lot of someone to guess at how it will perform.



rtdkota
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11/08/2004
14:32:56

RE: 1.6 vs. 1.7 rr's
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The cam you have is fine-- not too aggressive-- but you can run the 1.7s on that (but you'll need to get the proper length pushrods, just the same with the 1.6s)--- Get the 1.7s, if the cam is too aggressive for your then you can always go back to the 1.6s--- For your 408 though, it'll rip.

I sell and use Crower roller rockers--- as well as Crower cams. Do this all the time.

If you already have the cam, the cost of the 1.6s vs. 1.7s is the same from me--

Let me know if I can be of assistance.

Sam

619-274-1292

www.socaldakota.com

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