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Discussion Starter #1
Today we took out a 429 4V out of a thunderbird, and have a few questions. How good is this motor? Is it worth it to get a set of 460 heads and 460 crank? Or just leave the 429 stuff there? Or how about a set of CJ heads, if I can find them?
Which will give us the most street power, with limited costs?
Thanks.
Matt
 

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if it was mine, I'd get a 460 crank and pistons, use the 429 heads with large valves and clean up the exhaust ports. With a decent cam and 9.5 compression, I dont see why you couldnt make 450 hp/500 lb-ft quite easily, and it will still be very streetable.
 

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It depends what year the 429 is as I believe they went to the big chamber heads in 72.If its an earlier one you have a decent set of heads and the only benefit you can get from a 460 is its extra stroke.Just swap the crank and a set of
pistons of your choice and your in business.
 

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Yeah definitely check on year of engine. If its a '72 get rid of heads and swap them for some early ones. It will raise compression way up as the '72 429 engines had flat top pistons with valve reliefs. Also if '72 or later swap timing gear for '71 or earlier. The '72 and up are retarded at crank.
 

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Discussion Starter #6
it is a 69 engine. would 460 pistons work, like stated above? I didn't think it would because isn't the bore different? I know the crank would work, but not the pistons. Would I have to use 460 rods with the 460 crank? or 460 crank W/ 429 rods and pistons?
Thanks for the help
Matt
 

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What are the casting numbers on the block close to where the starter mounts and the head's around the exhaust ports?
 

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Discussion Starter #8
I will check when I get home to night...why is it important??
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Both 429 & 460 utilize the same 4.362 bore, the 429 has a 3.35 stroke where the 460 has a 3.85. Experience has taught me never to re-use a 429/460 piston, I've seen too many broken. You will notice a difference using the 460 crank, rods are the same 6.605 length. Make sure to use the early heads but use caution in doing port work & selecting valve sizes.
 

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It the casting numbers are early like C9VE or D0VE....then I would rebuild the 429 instead of spending the money to chase the 460 itmes needed to make it into a 460. Plus, most after market off-the-shelf 460 pistons have like 22cc dish in them which cuts the CR even lower.
 

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if you use stock 22cc dish pistons with the early 75cc heads (DOVE or C9VE casting, among others), it should give you approx 9.2-9.5:1 compression in a 460. Thats plenty if you plan on driving on the street. Also, nothing against a 429, but a 460 makes a flatter torque curve, where a 429 will make more top-end power. Dont get me wrong, a 429 is a great motor, but if you're cheap like me and your 429 crank is ok, just get a set of decent pistons and use what you have...it should make plenty of streetable power.
 

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I couldn't agree with you more MavMan. The 429 would have more than enuff power and torque to burn the tires off most cars with a good intake and a mild to hot hydraulic cam.
 

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429/460 use same bore and connecting rod length. The stroke in a 429 is 3.59 and the 450's is 3.85. The early blocks(pre 71) like the 69 have a 10.30 deck hieght where in 71 they went to a 10.31 and after that 10.322 deck hieght. You can use 460 pistons and crank in any 429 block along with any 429 or 460 rod(same length). Although when mixing and matching cranktrain parts I would have them rebalanced. Pretty easy with a little head work to make 1 hp per cube with these engines. I would use the heads you have with a dished 460 piston to get compression down to 9.5 to 10-1. Use the rods you have and a 460 crank. pre 72 429/460's have high compression....10.5-1 or better stock.
 
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