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#1 |
Registered Member
Join Date: Mar 2000
Location: Berwick,Pa
Posts: 127
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![]() my car's current set up is a set of ported e7's, edelbrock performer rpm intake, e-cam, 1.6 rr's, 65mm tb, and adj fp regulator. my question is if changing my roller rockers to a 1.7 would help me squeak out a couple more rpm in my powerband. my heads and cam are nicely matched but my intake is designed for 1500-6500 rpm. i chassis dynoed my car and had 241 whp at 5200 rpm. if i change to the 1.7's will it bump up the power band or not. thanks.
jay |
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#2 |
Undescribable
Join Date: Sep 1998
Location: Ft Myers Fla
Posts: 1,539
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![]() I wouldn't think it would help at the top end. if you had a goood set of heads it might but with those ported e-7's thats probly about as high as your powerband is gonna be.
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Rice Haters Club Member #101 |
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#3 |
Registered Member
Join Date: May 1999
Posts: 5,246
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![]() I really doubt 1.7s are going to do anything for you. Those E7s may flow worse at max lift with the 1.7s than they would with 1.6s. The heads are just not designed with high valve lift in mind. Also, if you haven't changed the valvesprings, the 1.7s will exceed the maximum .500 lift your springs were designed to accomodate.
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#4 |
Registered Member
Join Date: Aug 2002
Location: SanAntonio, Tx
Posts: 957
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![]() True, unit, but i will say i had 1.7's on my stock setup, i did notice a pretty good gain on the street, and track, but then again that was going from stock stamped.....
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear |
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#5 |
Registered Member
Join Date: Sep 1998
Location: Oviedo, FL
Posts: 992
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![]() Don't think you'll see much difference.
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"Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic |
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#6 |
Ride Hard
Join Date: Oct 2000
Location: Wyoming IL
Posts: 1,094
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![]() Some of the guys will argue the added stress of the 1.7's to the valvetrain is not worth it. I have 1.7's, but put this all together from scratch, so cant tell ya how it did with 1.6's or anything like that.
Ryan
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65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored |
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#7 | |
Registered Member
Join Date: Nov 1998
Location: Houston, Tx.
Posts: 3,887
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![]() Quote:
I actually went from 1.7 RR's back to 1.6 RR's when I changed cams. My application is for a flat tappet rather than a roller cam. I changed cams going to .509/.512 lift. I really didn't want much more than that with a flat tappet, so I sold the 1.7's to Ryan. With roller lifters, you can tolerate steeper valve lifts without stressing the valve train as much as long as you have adequate piston/valve clearance and as long as you have adequate valve springs. "Adequate" is the key word here. My belief is that a little over .500 valve lifts is OK, and does not compromise longevity of the cam/valve train for a street driven car. "More's law" states that "more is not always better" and may apply here. Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe Last edited by Rev; 02-26-2006 at 03:10 PM.. |
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#8 |
Registered Member
Join Date: Mar 2000
Location: Berwick,Pa
Posts: 127
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![]() thanks alot guys, you just saved me a couple bucks that i can put toward lca's and drag radials.
jay
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'89 GT hatch back performer rpm intake, performer rpm cylinder heads, fms e-303 cam, kirban adj fp regulator, holley 65mm tb, harland sharp 1.6 roller rockers, alum driveshaft, 3.73 gears (283 rwhp, 303 rwtq new numbers with new heads) |
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#9 |
Ride Hard
Join Date: Oct 2000
Location: Wyoming IL
Posts: 1,094
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![]() As Rev pointed out, he had the 1.7's and helped me out when I needed some rockers for the new set up. The 1.7's might help a little, but I personally would say use the moeny in another area of the car, or better yet, save that money towards a better set of heads.
I have yet to run my new combo, but I will tell you the "seat of the pants" feeling has gotten me wanting even better heads now! Rev - Sure did work out, thanks again!Hoping to get it tuned good, had a stumble off idle last year when I put it up. I think with the boards help I may have it figured out. Ryan
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65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored |
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#10 |
Registered Member
Join Date: Sep 2000
Location: rock hill,S.C. 29730
Posts: 420
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![]() I had them on my car that was bolt-on'd out except for intake and I think it at least reved faster and had a little more power, I did put in new valvesprings when I swapped rocker arms.
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88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ |
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#11 | |
Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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![]() Quote:
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Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/ |
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