: ht4100



red caddy coupe
03-25-09, 08:11 PM
i have a nice 83 coupedeville w/ a ht4100, the motor is locked up,should i rebuild or do an engine swap, and if i swap what engine is the easiest fit or cheapest way to go,i really need help,thanks in advance so much

akimball442
03-25-09, 08:57 PM
Buy a parts car with any other engine and it's an upgrade. You could find an 80 with the 368, or an 86 and up with the olds 307, or chevy engines later than that.

An olds 350 is a nice upgrade. But it would help if you had a car with the olds engine to get all of the accessory brackets, etc.

Rotted out wrecks that run well are generally inexpensive.

Lazarus_Rooney
03-27-09, 10:16 PM
akimball442 is right, basically any other drivetrain than the ht4100 is a good upgrade. the 307, IMO, simply isnt enough engine for such a heavy car and the transmission is known for being delicate. if you can find a 5.7 liter brougham donor car with a good engine thats probably the easiest way to do it.

sven914
03-27-09, 11:31 PM
The .307 would probably cheaper as it is less desirable. It is not as powerful as the .350, but there would be a noticeable power increase from the 4100. I have a .307 and have no issues with power; the only thing is the acceleration, which is way better than the 4100. Being used on almost every GM model (All Oldsmobile's, mid 80's to early 90's Cadillac's, larger Pontiac's, and 80's Chevrolet Caprice's) the .307 has also been proven bullet proof and extremely durable. The .350 (used in the 90's Cadillac's) was only used from 1991 to 1993, when it was replace with the LT1, so its resolve is questionable.

akimball442
03-28-09, 12:03 AM
I think the 4100 has a 3.42 axle. The 307 would have very adequate acceleration with that final drive. 307 equipped Broughams are also very common to find in bad condition inexpensively.

They can be modded to run with the EFI, but in most states the car is old enough to just stick a regular carb and distributor on it, tune it up, and run.

A small CFM 4bbl Holley runs VERY well on a 307. Better mileage than a Q-jet, also.

jey
03-28-09, 08:19 PM
Being used on almost every GM model (All Oldsmobile's, mid 80's to early 90's Cadillac's, larger Pontiac's, and 80's Chevrolet Caprice's) the .307 has also been proven bullet proof and extremely durable. The .350 (used in the 90's Cadillac's) was only used from 1991 to 1993, when it was replace with the LT1, so its resolve is questionable.

The L05 350 has just as long a proven history as the 307. It was used in all the Chevy/GMC full-sized vans, trucks, and SUVs in the 90s until the Vortec 5300/6000 came out...

sven914
03-30-09, 11:35 AM
The L05 350 has just as long a proven history as the 307. It was used in all the Chevy/GMC full-sized vans, trucks, and SUVs in the 90s until the Vortec 5300/6000 came out...
:banghead: I forgot it was introduced in 87 and it continued to be used in trucks until 1996. I was just thinking about its use in cars.

But still, Iíve never heard one be described as bullet proof.

jey
03-30-09, 12:55 PM
But still, Iíve never heard one be described as bullet proof.

What about the Silverado that made it to 1 million miles, on the original L05 motor?

http://www.truckblog.com/story-1653-1991_chevrolet_silverado_hits_1_million_miles

My parents have a 93 van with the L05 and it has almost 190k miles on it now, hasn't had a single issue ever and still runs strong.

sven914
04-01-09, 11:26 AM
What about the Silverado that made it to 1 million miles, on the original L05 motor?

http://www.truckblog.com/story-1653-1991_chevrolet_silverado_hits_1_million_miles

My parents have a 93 van with the L05 and it has almost 190k miles on it now, hasn't had a single issue ever and still runs strong.


I agree that the .305 was built strong and is reliable, however it is one thing for an engine to function without a problem. It is something completely different for engine to function despite problems. My engine has seen severe vacuum leaks (an open PCV system, cracked carburetor gasket, cracked hoses, and no hoses all at the same time) and still ran. I bought it with blown valve cover and oil pan gaskets (both of with cause vacuum leaks), a misadjusted carburetor, and bad tires (not engine related but still annoying). For three years, and to this day, the engine has run with two blown heads.

Despite these so numerous problems, the .307 has NEVER failed to start in the morning. It has never left me late for work, or stranded in a parking lot waiting for AAA. I have fixed all of the problems, except the heads, but all of the vacuum, oil, and coolant problems coexisted during the first year and a half that I had the car. Bulletproof is not the engineís ability to avoid problems, but the engineís ability to continue to run on its worst day.

Aron9000
04-02-09, 04:52 AM
I'd see if you could find a trashed/rusted out Brougham with the 305 or 350(91-92 would have the TBI 305 standard, the TBI 350 was optional from 90-92), I would buy it and swap the engine/trans. A box caprice with a TBI engine would also be a good choice.

Even if you have to rebuild the engine or trans, this would be much cheaper because you already have all the little parts you need, and you can probably make an easy $500-$1000 selling other parts off the car.

Remember when you do an engine swap, its the little nickel and dime stuff that adds up and will frustrate you when you have to track down parts. Things like engine mounts, fasteners, wiring harness, vacume hoses, fuel lines and parts, throttle linkages, sensors, etc.