The motor is for my 1971 411. The current engine(1.7) has a about a 2 in hole in the block.
My car is auto and fuel injection.
Am I going to need replace the heads on the "new" motor because it was carburated?
Question on heads
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wirehair
- Posts: 4
- Joined: Tue May 01, 2012 9:52 am
Question on heads
I bought an engine today 1.7 type 4. It came out of 1972 van. The van was a manual tranny with carbs.
The motor is for my 1971 411. The current engine(1.7) has a about a 2 in hole in the block.
My car is auto and fuel injection.
Am I going to need replace the heads on the "new" motor because it was carburated?
The motor is for my 1971 411. The current engine(1.7) has a about a 2 in hole in the block.
My car is auto and fuel injection.
Am I going to need replace the heads on the "new" motor because it was carburated?
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raygreenwood
- Posts: 11910
- Joined: Wed Jan 22, 2003 12:01 am
Re: Question on heads
The 1.7l heads were identical for both carbed and fuel injection. There were a couple of different letter codes one of which had some slightly better casting qualities (Q letter code I believe)......but....in general the heads from a bus are very poor cores to start with because the heavy weight of the bus made for frequent overheating and was very hard on the heads.
To be worth adding to an engine they should be completely rebuilt...that means new valves, springs, guides...checking for cracks which you should expect with bus heads....andprobably a light skim of the cylindeer seating areas to make sure they are flat...pluss replace all of the studs for the exhaust. You need to make sure you use a shop that has experiencee with type 4 heads...not type 1,2 or 3 heads. That experience is good but no substitute for real knowledge of type 4 heads.
I would not just take bus heads off of a bus engine and then put them on another engine as is.
Sorry I just realized that you are using the whole engine....but the same goes. Go through the heads.
Also if your 411 is injected....there will be some retuning to do. The bus had considerably lower compression in its 1.7L engine than the 411....hence the bus got about 67hp and he 411 with FI got 82 hp. If you have D-jet its going to be hard to tune. The bus had dished pistons and the 411 had domes.
Ray
To be worth adding to an engine they should be completely rebuilt...that means new valves, springs, guides...checking for cracks which you should expect with bus heads....andprobably a light skim of the cylindeer seating areas to make sure they are flat...pluss replace all of the studs for the exhaust. You need to make sure you use a shop that has experiencee with type 4 heads...not type 1,2 or 3 heads. That experience is good but no substitute for real knowledge of type 4 heads.
I would not just take bus heads off of a bus engine and then put them on another engine as is.
Sorry I just realized that you are using the whole engine....but the same goes. Go through the heads.
Also if your 411 is injected....there will be some retuning to do. The bus had considerably lower compression in its 1.7L engine than the 411....hence the bus got about 67hp and he 411 with FI got 82 hp. If you have D-jet its going to be hard to tune. The bus had dished pistons and the 411 had domes.
Ray
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wirehair
- Posts: 4
- Joined: Tue May 01, 2012 9:52 am
Re: Question on heads
Alright Ray thanks for the info.
FYI- I plan on using the "new" block/heads with my 411. The block on my previous motor is trash now and i believe one of heads too.
FYI- I plan on using the "new" block/heads with my 411. The block on my previous motor is trash now and i believe one of heads too.
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wirehair
- Posts: 4
- Joined: Tue May 01, 2012 9:52 am
Re: Question on heads
Well, I am going to need to rebuild the whole thing. Can I get some recommendations for rebuild kits?
Any thing i should stay away from?
Any thing i should stay away from?