460ci HP
Elder User
Joined: Aug 2001
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460ci HP
About running high compression engines on today's gas: I've pulled a dozen or more sets of 68-71 heads. The pistons of every 460 (10.5:1) have been fine. The pistons of every 429 (11.0:1 I think) have been damaged. From this small sample, the extra little bit of compression in a 429 seems to be too much for currently available gas.
Posting Guru
Joined: May 2003
Posts: 1,211
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From: York, NE
460ci HP
Looks like your Towncar should be getting 202 HP @ 4000 and 356 ft-lb @ 1600. That's if the Towncar is the same as the Mark IV.
Here's a site you might like.
www.automotivemileposts.com/prod1977mark5.html
Here's a site you might like.
www.automotivemileposts.com/prod1977mark5.html
Last edited by AG4.0; Jul 2, 2003 at 02:31 PM.
Freshman User
Joined: May 2011
Posts: 41
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From: tucson az
does any one have pictures of this "smog Bump"????
You can achieve 360hp using the early or late heads with a compression ratio of about 9.5:1 by piston selection. Grind down the smog bumps on either head, use a cam of about .500/.515 lift, 205/215@.050 duration, a dual plane aftermarket intake manifold, a 750cfm carb, a good set of headers with a true dual exhaust and you'll probably be closer to 400hp.
The weak design in all 385 heads is the exhaust port. It was compromised to fit between strut towers on intermediate sized vehicles of the late '60s and early '70s. Anything you do to enhance the exhaust, such as grinding off the smog bump (worth 25hp according to lore), simple cleaning up of port casting marks and especially a set of headers with a good 2.5" exhaust system is well rewarded.
A good approach is to tear the engine down and put together a working budget for the shortblock. Then you'll know where you're at financially. Everything else is bolt-on, and the shortblock will run fine with stock heads and accessories until additional funds become available for bolt-on modifications.
The weak design in all 385 heads is the exhaust port. It was compromised to fit between strut towers on intermediate sized vehicles of the late '60s and early '70s. Anything you do to enhance the exhaust, such as grinding off the smog bump (worth 25hp according to lore), simple cleaning up of port casting marks and especially a set of headers with a good 2.5" exhaust system is well rewarded.
A good approach is to tear the engine down and put together a working budget for the shortblock. Then you'll know where you're at financially. Everything else is bolt-on, and the shortblock will run fine with stock heads and accessories until additional funds become available for bolt-on modifications.
Elder User
Joined: Apr 2011
Posts: 632
Likes: 1
From: Bremerton, Wa
I've got a 77 F250 I too was wondering about HP/TQ numbers for it
I believe the 77 cars had more emissions stuff than the trucks
if I read right, the 77 pickups were the last without catalyst exhaust.
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zimman20
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
4
Nov 14, 2002 01:24 PM
merc460
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
3
Nov 8, 2002 10:09 AM
the law
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
1
Sep 6, 2002 01:14 PM
mikej
1987 - 1996 F150 & Larger F-Series Trucks
3
May 20, 2002 11:08 PM
chilly460
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
2
Jul 11, 2000 11:32 PM
19681971, 429, 460ci, engine, ford, horsepower, hp, intake, manifold, power, specifications, specs, thunderjet, torque, v8
