hi camaro.net,im got a 69 camaro z/28 with a 355 afr 195cc straight plug heads, comp cam xs268s flat tappet solid cam,i talked to afr about this cam and valve springs, they told me i cant run comp springs with there head,i called comp cam they said the springs are fine,i called doug herbert they also said there fine,afr wants me to run there 1.55 springs at 130@1.8,340@1.25,i have 1.437 at 120@1.8,310@1.25 with a rate of 345,the lift on the cam is .488 .501,@.050 230 - 236,afr told me to either change the cam to a hydraulic or ship the heads back to them for the bigger springs and machine work,they also said if i didnt change the springs i would get valve float at 4000 rpm,who do i believe,the motor is ready to be fired up,any info would be great ,thank you

well i cant really tell you if the springs would work with THAT cam or not. my gut felling is yes. however, i did get the upgrades for mine, and when my engine builder checked the upgraded springs (same spring your refering to) it was 140 closed and 380 open. i run a hyrdroller and get valve float at 6500

If I have done my calculating right , their springs rate is 381!

340-130 = 210

1.80-1.25 = .55

210/.55 = 381.8

Yes, your springs probably will work fine but I haven't really looked all that close at the stack solid thing...

But to please them, I would go with what they recommend OR, pull a fast one on them and go over to Competition Products, Lunati's or even CC and find the spring they want you to run AND buy it from whoever and not worry about it!!

Then go ahead and have the spring seats cut locally or rent the tools to do it yourself.. Jmho... pdq67