A 429 Question
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From: lake ariel usa
A 429 Question
I have purchased 2 429s over the past 2 weeks. One is a 1969 modified engine cam intake etc no questions on this. The second is a 1968 it is complete 4 barrel to pan fan to flexplate stock. How can I tell if this is a Thunderjet with the 365 factory hp? Or are they all thunderjets of that era. I havent a clue what type of vehicle it came in. I will be replacing my 460 tommorow with the 69 429since my 460 developed a bad piston slap after a cam failure. So anyway all help will be much appreciated.
Thanks alot Andy
Thanks alot Andy
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From: Nevada
A 429 Question
It could be a 429 or a 460. Pull the pan and look at the crank casting number - begins with 2 for the 460, 4 for the 429. Or pull a head, 429s had flattop pistons while the 460s were dished pistons.
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From: lake ariel usa
A 429 Question
I already know its a 429 George you helped me with those crank castings last week. Thanks though. I can see the flatops through the spark plug hole so until I can get the pan off we are pretty sure its a 429. My question is how can I tell if its a 365hp thunderjet or were all the 429s in 68 a thunderjet. Im in the process right now of finishing the 69 429 installation since I had alot of problems with my 460 and scoring this engine maid things alot better than fixing it. Not to mention with the c9 heads and flatops I got some compresion to work with. Gonna have to get some gas station credit cards lol. But if you or anyone can answer the thunderjet question great. Andy
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A 429 Question
I'm pretty sure ,The 4 Barrel carb boosted the HP from 320(2v) to 360(4v)
Get me Carb numbers or distributor numbers.
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Get me Carb numbers or distributor numbers.
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A 429 Question
As I recall, compression ratio was the primary difference. The 365hp 429 4-barrel had two valve reliefs and was rated at 11.0:1 c/r, 2-barrel had three valve reliefs and was 10.5:1 c/r, Lincoln 460 had dished pistons with 360hp @ 11:.1 c/r and the CJ 429 was two valve reliefs with a higher compression height on the piston for 380hp @ 11.3:1 c/r. The CJ cam and valves added the extra hp.
All hp numbers prior to '72 were gross numbers for marketing purposes, and don't mean much unless you're running open headers, no accessories and an optimum tune.
All hp numbers prior to '72 were gross numbers for marketing purposes, and don't mean much unless you're running open headers, no accessories and an optimum tune.
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From: lake ariel usa
A 429 Question
Thanks guys. I can get those numbers tommorow mil1ion. Both of these 429s I got have 2 valve reliefs. I didnt realise those hp figures were that inaccurate george. I had plans on rebuilding this 68 to stock form if it had those hp ratings for a 2wd truck or torino. Thanks Andy
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A 429 Question
Have a reputable machine shop balance the entire rotating assembly ($180), upgrade the cam to where it will spin to 5000rpm ($75), use a 750cfm carb ($50), grind the smog bumps out of the heads ($0), use adjustable poly locks ($25) on the rocker arm studs to adjust your lifter preload, install a true dual exhaust (?) and you'll easily be there for a minimal cost.
When you rebuild the heads, I'd recommend new valve springs and lifters even if you don't change the cam.
When you rebuild the heads, I'd recommend new valve springs and lifters even if you don't change the cam.
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A 429 Question
Three Valve relief's ?
Are you sure?
I have never seen anything other than single eyebrow or 2 eyebrow piston's.
The SP book doesn't list anything other than what I mentioned.
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Are you sure?
I have never seen anything other than single eyebrow or 2 eyebrow piston's.
The SP book doesn't list anything other than what I mentioned.
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A 429 Question
The 429 SCJ used a single eyebrow picton to raise the CR to 11:1.
Stock 429's had two eyebrows > 10.5:1
Late 70's 460's had a racetrack style oval indent on the piston.
The use the term Grand Canyon to describe the relief.
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Stock 429's had two eyebrows > 10.5:1
Late 70's 460's had a racetrack style oval indent on the piston.
The use the term Grand Canyon to describe the relief.
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From: lake ariel usa
A 429 Question
On the 69 429 I put in this week its C9VE-A heads C9VE-B block. Im going to pull the 68 apart this week. It has C8VE-A heads and a C8VE-? block. I only scraped away enough grease to see the C8 on the block but I did see the 2 eyebrow flatops through a plug hole. Andy
