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What to do with a 1970 429 for rebuild?
Rebuilding an N code 429 Thunderjet engine for high performance street,with a pump gas,93 octane,friendly compression with the iron 75 cc or possibly the Edelbrock RPM Performer heads. Anyone have any piston combos that will work for this? 9-9.5 compression with the stock 75 cc iron heads? Or 10-10.5 compression with the aluminum RPM heads?
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When using 75cc heads:
9.25:1 will require a -20cc dish 10.25:1 will require a -10cc dish Flat tops will give you approx 10.7:1 if left in the hole a bit, which can work with alum heads and pump gas. There is unfortunately a very limited selection of off-the-shelf 429 pistons available if using a stock rod. Stock cast replacements like the Silvolite 1161's have a -12cc dish KB offers hyper flat tops Speed Pro offers forged flat tops Other than that, you'll need a custom You can use 460 pistons with the 429 crank and aftermarket cadillac rods if you're willing to do a little work on the rod bushings. You can also use a 460 crank, the rods you have and 460 pistons. |
I know it'll stroke to 501. Use Edelbrock or Cobra-jet heads with a 10.5:1 compression and get over 600 HP.
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He he he!
http://www.jonkaaseracingengines.com...bbf-heads.html Cobrajet, smobrajet! http://www.jonkaaseracingengines.com...ries/nine1.jpg Hey, you asked! :LOL:Steve |
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