HO Engine Question(s)
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Tuned
Joined: Jun 2006
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From: Graham WA
HO Engine Question(s)
5.0 HO Engines have a different firing order than other 302 engines (same as the 351). This makes me think that the crank and cams are not interchangeable with other non-HO 302s. Sence the firing takes place when the cylinder is at TDC of the compression stroke, then at a minimum the cam would need to change to change the firing order. Is this correct thinking?
Can the later year EFI HO engines be run with a carburator fuel system?
Can the later year EFI HO engines be run with a carburator fuel system?
Lead Driver
Joined: Nov 2002
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From: Concord, NC
The cam is the only thing that changes the firing order. The cranks are the same no matter which of the two firing orders is used. The only thing that might keep the HO cam from going into a regular 302 would be whether or not the block could accept a roller cam. I don't see why you couldn't slap a carburetor on an HO.
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Tuned
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From: Graham WA
That helps me make some choices with engine components I already have!
I have a good block from and earlier year 302 and I am going to use an HO rotating assembly and cam in it from my 82 HO which has already been bored once.
Thanks Eric.
I have a good block from and earlier year 302 and I am going to use an HO rotating assembly and cam in it from my 82 HO which has already been bored once.
Thanks Eric.
FTE Legend
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From: Ottawa, Ontario
'86 was the first year for the factory roller cam, so both your blocks are flat tappet. No problem putting a carb on an EFI motor, if going the other way however the cam usually has to changed, but it's usually because the carb'd motor's cam lobe seperation angle is too short for the EFI system.
Last edited by Conanski; Jul 12, 2007 at 12:06 PM.
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Tuned
Joined: Jun 2006
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From: Graham WA
Well my 1982 5.0 (302) HO has essentially a marine flat tappet cam (stock) and does not have the taller tappet bores needed for the EFI roller set up. So the rotating assembly should work ok in any non-roller block I think.
If I should find an EFI roller block in the mean time, I would likely lean towards a roller motor, but in either case it will be carburated with E7 heads which I already picked up.
Thanks for your help.
If I should find an EFI roller block in the mean time, I would likely lean towards a roller motor, but in either case it will be carburated with E7 heads which I already picked up.
Thanks for your help.
Last edited by E30tdf; Jul 12, 2007 at 06:40 PM. Reason: clarity
Elder User
Joined: Oct 2006
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From: Redmond, WA
Originally Posted by E30tdf
, I would likely lean towards a roller motor, but in either case it will be carburated with E7 heads which I already picked up.
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.
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Joined: Dec 2001
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From: Louisville,Ky.
Actually 85 was the first year for the Roller cammed 5.0. It was the only carburated version. You can get a brand new 5.0 roller block that is already finish bored 4.000 and line bored fairly cheap from Summit racing. Then you could use all of the internals in that.
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Tuned
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From: Graham WA
I was able to pick up a used roller short block from a 92 today off craigslist, including the forged pistons. The bores look good and she turns real easy. Sweet! I'll check her over good and see whether it needs bearings at this time. Now I can pick my roller cam and lifters of choice. The E7 heads I got earlier have already had a little port work done on them, but I wouldn't know whether it is a complete port job or not!
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You can put a carb on any of the 302's between some friends and myself we have motors from 79 to 95 all with carbs for that matter you can put a roller cam in a speed density vehicle without going mass air. In the newer vehicles you would always have the check engine light on but it will work. Just wire the dist. up for the 351 firing order if you decide on going roller.
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From: Ottawa, Ontario
Originally Posted by 92OldBlue
.. you can put a roller cam in a speed density vehicle without going mass air.
FTE Legend
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From: Ottawa, Ontario
Originally Posted by LxMan1
My friends 96 5.8L F150 has MAF and another friends 94 5.0 has MAF.
My point was that there were LOTS of speed density non HO roller motors right from the factory.
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Sorry to drop in on the thread but.....I have a speed density setup from a 89 van. Its in a 54 ford truck. Can I switch to a cam for a mass air motor? Will I also have to switch the Fuel injector harness to one from a mass air car and change the firing order on the distributor? I'm pulling the motor soon ....broken motor mount. So I figure I'll get a few things done while its out.
Thanks in advance,
rustfarmer
Thanks in advance,
rustfarmer