Hi can some one point me in right direction
I have researched there is two different firing orders for 302
How do I tell difference between the two different engines?
Don't know where the engine came from or what it was in
I read somewhere ho or non ho iirc

 

There is no good way to determine the firing order with absolute certainty because the cam could have been changed at any time in it's life, and the cam determines which of the 2 firing orders the motor uses. In general though most motors built before 1994(Mustang excepted) had the old firing order and all built after that date used the HO firing order. Look for the block and head casting numbers to determine the relative vintage.

 

If it has the original intake manifold on it the firing order will be embossed on it or do a search with the casing numbers on the block by the starter.

 

I will check manifold and look for cast numbers
What am I looking for and how close are they to the starter

And with reference to the change between ho and non
And just saying that nothing has been changed , is there any other noticeable differences between the engine variations

 

The block casting numbers are on the block right above the starter, there should be raised numbers on the intake manifold.
Not knowledgeable enough to answer your last question

 

Many thanks I will have good look tomorrow

 

It's Ho firing order but has a non ho carb manifold

 

How did you determine the firing order?

 

Well the truck was running with the ho order
But I just wanted to clarify
I saw the non ho order on the manifold so I thought I'd just try the wires in that order for peace of mind so put them to the order cast in manifold and it didn't run properly

 

OK very good.. you didn't mention you were able to run the motor and I didn't want to assume, that is certainly a good way to verify. Problem now is that also confirms you have a mix of older and newer parts or possibly an aftermarket cam. Did you find any casting numbers? If you have a late model engine you may find some capital letters cast into the heads on the very outside corners near the valve covers, these letters can help ID the heads and possibly the general vintage of the engine.

 

Yes I deliberately left that factor out so I got the help I needed , more so that I could understand what I had
Yes I understand the mix up of parts as its not an original car
I'm guessing maybe the engine is a injection engine?? With a carb manifold maybe if there was such a thing?

 

And I will look for numbers tomorrow

 

Yes it's possibly you have a late model EFI motor with a carb on it which would be a big bonus if it's a roller motor, the 302 block and heads never changed in terms of bolt patterns so you can mix and match just about any vintage of parts. To tell if it's a roller simply remove a valve cover and shine a light down one of the pushrod holes, if you can see a fork looking device around the base of the lifter you have a roller. You may have to remove a rocker and pushrod to do this, but pedestal mount rockers are simply torqued down so you don't have to worry about messing up lifter preload.

P.S. If you go that far... before reinstalling the rocker put a dial gauge on the pushrod after it has been inserted into the lifter and crank the motor through a revolution by hand to measure lobe lift, this can then be used to figure out if the cam is stock and if so which one it is.

 

I'll check that tomorrow too
Thanks for your advice
It's only got a two barrel carb on it tho ??