69 302 cam specs - Page 2 - Team Camaro Tech
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post #16 of 18 (permalink) Old May 19th, 08, 07:07 PM
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Re: 69 302 cam specs

I think the hydraulic cam limits the usable Rpm of the 302. Taking mine to 6k is nothing and I think that's about the limit with the hydraulic cams.

1968 Z28 British Green, all original except CE 302 engine. Have original owners booklet and protect-o-plate.
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post #17 of 18 (permalink) Old May 31st, 08, 09:04 PM
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Re: 69 302 cam specs

Quote:
Originally Posted by vveary View Post
Why is it that you can get away with high compression and 92 octane on a 302 and not a 350? Is it cam related in this case? ..........

Vince
It is because of the late closing angle of the 30-30 cam, which defines dynamic compression. The static compression of a stock 302 is approx. 11:1. The dynamic compression is approx. 7.5:1. The intake valve does not close until about 82 BTDC. Compression can not be started until the valve is almost closed. Put the 30-30 in a 350 and it would work the same. If you do a search on dynamoc compression you will find a ton of info.

"Government is not reason; it is not eloquent; it is force. Like fire, it is a dangerous servant and a fearful master." ..... George Washington

Gary,TC Member with a Lemans Blue/Ivory 02D X33, DZ, M20, MS, flat hood. Only the BU code rear end is original.
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post #18 of 18 (permalink) Old Nov 14th, 13, 03:41 PM
Murf
 
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Question 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
112 108
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
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