Join Date: Jun 2012
Location: Pinellas County, FL
Re: 69 302 cam specs
Hey guys - This old man needs your tech brains on my Cam SPRINGS. I have built a #3932386 block / #3927186 heads (ex Z parts) engine, but modified it a bit). The block is .030" over = 306 ci (but I still call it a 302). The 2.02 / 1,60 heads have been markedly upgraded.
The mods are: I went from the big 4 barrel to 3-2 barrel Rochester 2Gs on a retro Offy manifold with almost exactly the same WOT air flow (CFM) on progressive linkage.
The 30-30 has been changed to a Howards Roller Kit CL110255-12
Dur IN Adv EX / Dur @.050" IN EX / Valve Lift w/1.50 Rockers IN EX
284 288 231 235 .510 .530
Separation Angle Intake Centerline
I bought thru Summit BUT counseled with Howards before I bought any of the Kit parts (Cam & Lifters) and the valve train parts (Push-Rods, Springs, Retainers, Keepers and Rockers and even the Cam's Thrust Button). I was sent the Howards 98214 Valve Springs which have been installed, each at precisely the same height. The engine is NOT yet installed as I am working on the 700R4 Lock-Up kit and on fitting the (darn) aluminum Torque Converter Cover (am on my 2nd from a Tampa Corvette parts shop).
I have just found out that these are their Performance Hydraulic FLAT Tappet and also their Performance Mechanical FLAT Tappet Valve Springs (per the Howards web site). They do not list this part number for their Performance Hydraulic ROLLER Tappet Valve Springs. The #98214 springs are rated at 115 psi @ 1.70 Closed and 300 PSI @ 1.250 Open with an outer OD of 1,250" and a MAX lift of 5.00. While they list a #98213 @ 125 psi @ 1.80 Closed and 374 psi @ 1.200 Open and an Outer OD of 1.265" and a MAX lift of .600.
I suspect I have received (& installed) the wrong springs for this Cam. Anyone out there have good or bad info for me? Murf