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Originally Posted by 68bird400HO
Judge273,
Curious as to the specs on your motor. I will be building mine soon and am debating about keeping it within PS guidelines or going for a little more. I am guessing that Dan used a cam close to the 068. Does the cam used actually have the same low lift of the 068 (0.407) or is it an aftermarket grind (2801)? What about the compression ratio. In the SD vs HO article I thought he mentioned he got the HOs CR to 9.4:1. How did he get that with the 111cc chambers of the 197s? Using the online calculators, it seems the best I can get to is about 8.8 (flat tops, zero deck, slight milling) without milling a bunch off of the heads or going to a domed piston.
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Mike and Dan can certainly answer better than I, but briefley Dan does.
Blueprint the engine to NHRA stock specs, per PSD rules. Overbore to maximum allowable, custom pistons to increase CR, custom ground camshaft to decrease the LSA and increase the lift. Good stock-angle valve job. Spot-on mchining, assembly and tuning techniques.
http://www.geocities.com/psmcdr/rules.html