from the factory they were rated at 365hp ,but in reality im told they were probably closer to around 325.so depending on who did your headwork im guessing maybe 345-350 on a bone stock 429.now add a alumn intake headers ,cam and carb and then you could be around 425 or so
so many chevies, so little time
Well a 429 4 barrel (4V stand for 4 venturi, the 429 has 16 valves) with ported & polished D0VE heads is hardly stock and the definition of "ported & polished" is pretty generic. The factory rating for the 69-70 429 ThunderJet with 11:1 compression and a 4V carb was 360. That was SAE gross HP which consisted of dynoing the engine with no accessories and a minimal exhaust system. Some say that it was over rated for advertising purposes although the 429 CJ was rated at 370 HP and the consensus seems to be that it was under rated for insurance purposes.
If and that's a big if, the head work was done correctly there could easily be an additional 30-40 HP depending on the exhaust configuration. If all they did was hog out the ports & gasket match then it's probably just a 429 block with a pair of iron paperweights bolted on top.
The factory rating for the 429 CJ was 370 HP @ 5400 RPM/450 TQ @ 3400 RPM. I have a stock 429 4V ThunderJet in my 1970 XL. It pushes that 3800 lb car around just fine even with the tall rear end gears. The only modifications to the engine are a Pertronix Ignitor ignition module and a BG Demon 725 CFM carb.
I'm new to this site and just recently bought a 64 f100 and also purchased a 429 w/ c6 tranny. Since I'm new to the ford world I was wondering if anyone knew what year/type engine I have, C9VE-B from what I can gather is a 69, but other than that I'm not sure.
I believe that those are the 9.5:1 compression heads. I don't know specifics on the 429, but since I have a 460 with the same heads, I do know that they produce about 360 HP. You will have to run Premium with them too.
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