Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Welcome to ThirdGen.org!
Welcome to ThirdGen.org.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!
I have a 350 TPI accel 6 programable computer, stock 88 base,edelbrock runners,rpm heads milled .030
heads are now 64cc
head gasket .015
flaltop
bore 4.00
stroke 3.48
rod 3.700
CCA-12-256-4 COMP Cams Xtreme Energy Camshafts
Camshaft, Hydraulic Flat Tappet, Advertised Duration 256/ 268, Lift .449/ .456Intake close at 56 deg.
cr is 10.23
dcr is 8.95 using Pat Kelly's cal.
What cam do you recommend to bring DCR down to below 8.5?
I know it is a screwball setup but Thanks for any help you can give me.
The cam most likely comes with 4 degrees advanced built in. Try retarding the cam a degree at a time on Pat Kelly's calculator and see what happens. You might wind up with 4 degrees retard which in reality would be "straight up" with no advance.
It's the intake valve closing point which determines DCR. So if you want to change cams go to the next largest cam and that alone might do it for you depending on the IVC. Again you can play with the advance or retard some to get the DCR you want.
Thanks, 1989G TA TransAm.
Checked and you are correct.The cam has a 4 deg advance builted in.
Can it be retared 8 deg ,that will put it 4 deg retard from "straight up"
This will put my DCR at 8.2 Just what i want.
Will this cause me any other problems that you can think of?
4 degrees retard will take all the advance out of it. That's as far as I would go. I believe any more than that and your valve events will get out of control. The cam you have selected is not all that big. Might go to a bigger cam or a thicker head gasket. Was the block decked at all? Did you have a chance to measure how far down the hole the piston was? Just trying to figure out why you are using a .015 head gasket.
Using .018 instead of .015 will lower the dcr by only .06. It came out 8.67 using .015 and 8.61 with .018.
Yes the pistons have valve releaf.I used 6cc to calculate the dcr.
Thanks again for your posts. I think my best bet is to find a cam with 64deg
intake valve closing witch will give a 8.2 DCR.
