Hi all. i am going to put my 460 on propane and then turbo it. i wasa wondering what i would have to do to prep my engine. it is a 460 out of a 1976 couger XR7.
i see mention of ceramic coating in the combustion chamber. special valves ect......
if someone could give me a rundown that would be great.
Thanks all

 

Generally you want to lower the compression if your motor wasn't originally from a turbo car/truck. how much boost are you looking to run on it? What kind of turbo?

 

see, that is the thing. im not sure how much boost. i heard that 8 pounds or so boost is realy safe and reliable.
i believe the compression ratio for my 460 is 9.5 to 1 . is that to high ? since propane has a octane of 108 or so i thought that that would be
allright.
as for the turbo, what should i get. i do not know what size i would need for a 460. would a turbo off of a diesel work?
i want one with the wastgate built in just to keep it all as simple as possible. it is going in a 1978 f150 sb 4X4, and will be my daily driver.
this is all in the planning stages (very early) and will be my next year summer project. i want to get all of my parts and plans over the next 8 months .
any input, advice , pros and cons , ect from all are appreciated

 

I would recommend using forged components for your rotating assembly.

 

Intercool it too.

 

go to paxton website, these guys did the original set up for the Shelbys in 1966, carb'd engines. Thier tech staff are really great knowledgeable guys & will walk you through the whole process.
Have your vehicle weight, tranny, rear end ratio, comp. ratio handy when you talk to them.

 

Here is a thread about a person who turbo'd a 300 I-6. He used a turbo off of a GM 6.5 diesel.
https://www.ford-trucks.com/forums/s...d.php?t=250890

 

Don't do anything untill you get the book "Maximum Boost" by Corky Bell!!!

 

Boost doesn't make power is the CFM that make power.
On your 460 are you going to run twins or one single. If this is for lowend and no reves you can go 2 ways. One T70 with .81AR or two T04B's with a super 60 wheel and .81AR or close. Do not go over .96AR or you will have lag. As with any performance combo you get what you pay for and factory parts suck. I recommend that you use an external wastgate for better control.
I would go to the T70 as that can make upwards of 16PSI if needed. Its about airflow not PSI that we are looking at. Pay close attention to compressor maps to find out which turbo is efficently working and not generating too much heat. Twins add more heat than a single so you really need a good intercooler with the twins. On a single and less than 5-7PSi you can get away with not having an intercooler (I reccomend one) and with propane you wont have any combustion problems.

 

It's good to have an intercooler on any turbo'd vehicle. When air gets colder, it shrinks to a smaller volume so you can put more air in the piston chambers. (I think that's right anyways.)