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11-25-2007, 10:27 AM
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#1 | |
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AF Newbie
Join Date: Nov 2007
Location: Miami, Florida
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what size roller rockers should I use?
94 Mustang GT
I want to go with a set of heads that have these specs: Ford GT40P 289/302/ 60cc Combustion Chamber Pedastall Type Rockers Used Positive Oil Control Seals 5 Angle Valve Job Stainless 1 Piece Swirl-Polished Under-Cut Stems 1.940” Intake Valves Stainless 1 Piece Swirl-Polished Under-Cut Stems 1.540” Exhaust Valves AWSF-32C Spark Plug Springs Good to .550” Lift, (Hyd. Roller) *check cam manufactures specs for compatibility* (129 psi @ 1.800” / 280 psi @ 1.300”) and a Ford Racing E303 cam 2500-5500 rpm range What size roller rockers should I buy 1.6 or 1.7?, I want to know if 1.7 would work and how much horsepower should I get from 1.7 compared to the 1.6? Also what size pushrods should I get with either one? Last edited by dbbullet; 11-27-2007 at 03:57 PM. |
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11-25-2007, 08:20 PM
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#2 | |
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AF Enthusiast
 
Join Date: Nov 2003
Location: Asheville, North Carolina
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Re: what size roller rockers should I use?
Ok, you gave use some info but we still need more details. Stock bottom end? What heads (valve location/angle could make a difference)? The TFS I cam is designed for 1.6 rockers. 1.7 rockers might help but you have small heads so you wont feel a difference. I doubt it would be worth any piston modifications. As far as the pushrods go that will be up to you to figure out. You will need a pushrod length checker. Then color the top of a valve with a sharpie and install 1 rocker on the valve. Install the rocker to spec and then turn the motor over by hand. Adjust the length checker until you get a wear pattern that is centered on the valve stem. Then measure the length checker and you have the length pushrod that you need.
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1969 Cougar 357w & TKO - 475hp |
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11-25-2007, 08:38 PM
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#3 | |
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AF Enthusiast
 
Join Date: Nov 2003
Location: St. Louis, Missouri
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Re: what size roller rockers should I use?
Your combo is pretty close to the one I am presently running with the new ride. 1.7 roller rockers will raise your rpm band about 250rpm. But going back to what 351wstang was saying. What type of head are your running. That cam with 1.6 rr will do nothing for you if your running stock heads, let alone 1.7rr
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Ported Cobra Intake, Ported & polished Windsor Jr heads, K&N, Vortech s-trim, 90mm Lightining mass air meter, 70mm throttlebody,1.7 roller rockers, BBK Long tube headers, offroad H-pipe, Crane cam, main cap girdle, 40 series flowmaster, 3.73 gears, MSD ignition, CGS subframes, A9L PIH kit, SCT custom burned chip, 42lb injectors, 190lph fuel pump, T rex and fuel pressure regulator, AFCO racing radiator (If it doesn't scare the Hell out of you it isn't fast enough) |
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11-26-2007, 08:19 AM
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#4 | |
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AF Enthusiast
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Re: what size roller rockers should I use?
As far as I'm concerned any small/stockish after market head or ported E7 will see little to no benefit from the 1.7's over 1.6's. I made the power in my sig at about 6,000 rpms with a F303 camshaft on 1.6 rockers.
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1969 Cougar 357w & TKO - 475hp Last edited by 351wStang; 11-28-2007 at 08:52 AM. |
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