Re: Just brought a 429 with 4v heads
1973 was the last year of the 429 and emmission controls killed the engine by then. They have a dismal 7.6:1 compression ratio and are relatively powerless compared to the earlier 429s, but have some potential as the block and heads are the most common of the carbureted 429/460s
If you replace the factory dished pistons with flat top 429 pistons, you will manage about 8.8:1 compresison ratio. Then port the heads and the engine will run much more strongly.
If you replace the crank with a 460 crank and corresponding 460 flat top pistons, then compresion ratio will be closer to 9.2:1 and with the same porting you will have a very fun engine.
Of course, much more is possible (the potential is certainly in the parts)...it's just that for 1973 it was as detuned as it could be.
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