Or if you are up for it, you can always swap pistons, and/or have the deck surface machined if necessary. If its well below that with aother 64cc head, Id consider either going with a smaller chamber head, or you can go with the 64cc head if thats the only option but have them milled down some. If a 64cc head provides basically 10:1 comp with your current pistons and deck, than Id stick with 64cc heads. If you use the 274 cam, Id look for roughly 10:1 static compression give or take a little. That way, if you are set on a camshaft, you can use this info to figure what combustion chamber size you want, in order to acheive a compression ratio thats good for the camshaft you want. Obviously, if you are swapping cylinder heads, you have to remove the heads at some point, so if you arent sure of all the specs, this will be a good time to check into your pisons and take some measurements to find out what pistons are in there and what the deck height measure up to right now. Assuming you go with the 274, and assuming you are racing, Id say it will be beneficial to run it a little over six grand from time to time when it counts.Īs far as chamber size, that really depends on what the compression will be with whatever chamber size you decide on, and if that final compression is right for the particular cam choice. Why do you only want to go to 6000rpm? Not that Id reccomend revving the garbage out of a stock(or mostly stock) bottom end, but the 327 revs well enough safely that I wouldnt fear revving a little over six grand now and then, if its in good shape right now. The 274 cam is more reasonable, but its still gonna be plenty hot in a 327. As far as your cam goes, you can stick with it and with the right head, it should be radical at higher rpm, but you oughta have at least 10:1 compression to do it, and id definitely say go with better heads cause Id count on peak horsepower being in the 6500rpm range with the 284 cam in your motor. World heads are descent as well, but they too are in a lesser league. As CNC BLOCKS N/E said, cast iron vortec heads can work real well also, but they wont keep up with a lot of the higher priced heads out of the box, so if you want the performance but dont wanna spend time(and money) porting them Id step it up. Or, a 180cc afr or somethin like that if you can get em in your budget. If thats not a prob, Id pick those over the rpm heads. Assuming you were doing the top end all over, Id say the 274 cam or something similar, and an edelbrock E Tec 170cc head would be nice but you need a vortec style manifold as well as a 650 double pumper carb. More than likely the 274 will be a closer match to the compression ratio you have now. But, since it sounds like you want more of a hot car to play with, Id say the 274 would be a good change if you wanted to go that way. Well, if it were mostly street, Id say the 268 cam or something comparable. Other good heads that come to mind are pro topline, brodix, canfield, and edelbrock E tec(in no particular order). Either one will work well enough, so if for whatever reason, you are limited to one or another(maybe you get em used?), I wouldnt worry about it a whole lot. But, I dont think the 15cc worth of port volume is gonna make so much of a difference in torque to even worry about when you have such a large camshaft in a small motor(kinda gonna negate low speed torque anyway) in a light car with big 4.11 gears. Sure, the smaller head will be better for some torque. Most people will say the 180cc cylinder head is the best for the smaller displacement motor, but In this case, I wouldnt worry either way. Just be sure on what will happen to your compression ratio before any head swap. If you shop right, you can find a new AFR head for that price, and I definitely think the 4.11 gear is a good addition.
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