72zcar Posted December 2, 2003 Share Posted December 2, 2003 92 goodwrench 350. Edelbrock street master manifold, 600 edelbrock, hugger headers. What is the biggest cam i can use on this motor with the stock block and heads that came with the motor. Im looking at the summit k1103 214 in 224 ex or k1104 224 intake 224ex. or the comp 268H Is there any problems i may have with the pistons hitting the valves with the stock heads? thanks bob Quote Link to comment Share on other sites More sharing options...
Pyro Posted December 2, 2003 Share Posted December 2, 2003 You will not have any problems with the valves hitting the pistons until you get to a very big cam. The problem you have is low compression. I think you should not use a cam bigger than the comp 268. Make sure to use the comp 268 valve springs, double roller timing chain, and long slot rockers. Use the comp cam, not the summit cam. The comp cam will make more power. Quote Link to comment Share on other sites More sharing options...
72zcar Posted December 3, 2003 Author Share Posted December 3, 2003 If i have to replace the rockers, timing chain and valve springs i guess i wont be doing it. At least not for a while. Is the replacement of these things really nessasary? Quote Link to comment Share on other sites More sharing options...
Mike C Posted December 3, 2003 Share Posted December 3, 2003 Rockers probably not, timing chain is a 100k mile replacement part, so I would. Springs as well. my 104k mile Impala SS is short on top because of weak springs. Comp is fine, but too expensive in a budget motor. Crane Energizer 266 is an excellent cam for a street motor to 4500 rpm. Get some factory replacemnt Z.28 springs. The cam and lifters can be had for $100 and the springs are about another $30 if you shop around. Same with a good roller chain. Hardened locks are a good idea as well, and might as well do $2 worth of valve stem seals. Total should be right around $200. Quote Link to comment Share on other sites More sharing options...
72zcar Posted December 3, 2003 Author Share Posted December 3, 2003 the 92 goodwrench motor only has about 15,000 miles on it. does that change anything regarding the parts i have to replace? thanks bob Quote Link to comment Share on other sites More sharing options...
Mike C Posted December 4, 2003 Share Posted December 4, 2003 That being the case, just a cam and lifter swap would be OK. Just stay reasonable in cam size. Nothing bigger than the Crane 266 IMO (which is compareable to the Comp 260) Otherwise valve springs are mandated. WIth the compression and heads on that motor, anything bigger isn't worthwhile IME. You will like the prodigious torque output of the 266. Quote Link to comment Share on other sites More sharing options...
DavyZ Posted December 4, 2003 Share Posted December 4, 2003 Mike is correct about staying reasonable with respect to cam size and he makes some great suggestions. I bought the K1103 cam & lifters from Summit for my relatively stock Camaro V8 (1977 motor with 8.5:1 compression) for my ZV8 conversion. I read quite a few of David Vizard's books and also (the best for 'stock' engines) Tarrant & Hawkinson's How to Build Small Block Chevrolet Engines on a Budget. I came up with the K1103 cam and it's specs from the information I gleaned from the books--it fit the bill until I bought some Edelbrock heads with much smaller chambers (64cc vs 76cc) that bumped compression and flow. I should have held off on the cam until I had all the other parts together... Davy Quote Link to comment Share on other sites More sharing options...
72zcar Posted December 4, 2003 Author Share Posted December 4, 2003 With my stock goodwrench motor do you think i could bump it up to the sum-k1104 224in and 224 ex.? And with a stock converter? Thanks for all your replies. -bob Are buttons and lock plates required. from what i have read only with bigger cams and roller rockers. is this true? Quote Link to comment Share on other sites More sharing options...
Pyro Posted December 4, 2003 Share Posted December 4, 2003 I wouldn't. A comp cam 268 should be the absolute biggest you can go with a stock converter. A comp cam 260 might be a better cam for your setup. A light car (like a datsun) and higher gear (3.55 and up) actually lowers the stall of the converter even more. Also, I would not use a summit cam. Sure they are cheaper but those cams have very soft ramps (low intensity) which bleeds off cylinder pressure which effects low rpm and mid range power. Intensity is the advertised duration minus the duration at 0.050" lift. So a cam with a lower number has quicker ramps (more intense). Quick ramps increase cylinder pressure by closing the intake valve sooner and then allows more air into an engine because of longer duration over 0.050" lift. It is kind of like having the best of both worlds. Good low end torque and high rpm power. However, high intensity cams do wear out sooner. Except when you use a roller cam. I also think the summit cams have wider lobe centers which also lowers cylinder pressure by retarding the intake valve closing point and they also reduce cylinder filling because of less overlap. Less over lap (wider lobe centers) will make an engine less throttle responsive when using a carb. Wide lobe centers are good for emissions, efi, boost, and N20 but not for performance with a carb. 108 to 111 degrees of lobe center will work well for a carbed street engine and 112 to 116 for an efi or boosted engine. Anyway, that is my 2 cents. Quote Link to comment Share on other sites More sharing options...
72zcar Posted December 4, 2003 Author Share Posted December 4, 2003 anyone else, because i already bought it and its in the mail Quote Link to comment Share on other sites More sharing options...
Mike C Posted December 5, 2003 Share Posted December 5, 2003 Bummer. But they will take it back. The Energizer cams are about the best deal going IMO. The 110 degree centerline is excellent as is the reasonable ramp speed. The 260 is 210/210 @ .050 and .440 lift. Nice lift figures for the short ramps. Mine is in a 4 bolt main 327 in my Jimmy. It pulls HARD from just off idle to 4500 rpm. In a less than 5500# vehicle without the 35" tires, it should pull to near 5k, but no need to turn it that high. FWIW, I ran the Energizer 284 cam in the same motor (228/228 .480). With more compression and better heads than your goodwrench motor but 19 fewer cubes, it never ran right. It would pull 6800 rpm, but I am firmly convinced the car would have been faster with the smaller cam. WIth 4.56 gears and stock converter in ran 14.30's at 3500#(circa 1985) and 98 mph with 4.10 and 2800 converter it ran 14.0's also at 98 mph. All on plain jane street radials however. Send it back and get the Energizer 266. As noted it is effectively the same size as the Comp 260 but for the same price as just the Comp cam you get the lifters as well. I think it is interesting that you asked for advice then did something completely different! Quote Link to comment Share on other sites More sharing options...
72zcar Posted December 5, 2003 Author Share Posted December 5, 2003 yeah I did ask your advice then do something different. crap. Im going use it and see what happens. let u know. Quote Link to comment Share on other sites More sharing options...
DavyZ Posted December 5, 2003 Share Posted December 5, 2003 yeah I did ask your advice then do something different. crap. Im going use it and see what happens. let u know. Since they are so cheap (relatively speaking) don't worry about it and just use it. I bet the cam performs very well and you'll be fine. It may be true that they are not the best/most expensive cam out there, but they beat stock by a mile. Nothing wrong with not running a bunch of overlap on the cam either BTW, especially for your application. Keep us updated and let us know what you think about the cam when you run it. It should have good low end torque and pull right to 5000 rpm. Just be darn sure you break in that cam correctly... Davy Quote Link to comment Share on other sites More sharing options...
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