Roller 5.0 into a '66 - Page 2 - Vintage Mustang Forums

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post #16 of 37 (permalink) Old 04-12-2017, 08:47 PM
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'89 5.0HO in disguise.





Last edited by Psychodad; 04-12-2017 at 08:53 PM.
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post #17 of 37 (permalink) Old 04-13-2017, 03:52 AM Thread Starter
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Is that a roller 302? Is there anything special about the intake setup with regards to the tappet spider or bracket or whatever it's called?
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post #18 of 37 (permalink) Old 04-13-2017, 08:05 AM
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Yes, it's a stock 5.0 roller shortblock with GT40P heads. The intake is a castiron "A code" with the 1:08 4100 autolite carb, runs like a top. Everything from the 289 mates right up to the '89 5.0 block including the intake manifold. Of course you need the correct 50oz imbalance flywheel and balancer, I did have to modify the baffle in the left side valve cover to clear the rocker arms and plug the dipstick hole in the block. The 289 distributor works but you need to change the drive gear to one that's compatible with the roller cam. (Yes I'm running points on this engine) They're not on it in the first pic but it now has 289Hipo exhaust manifolds on it. I did a LOT of work on them with the die-grinder, hogging out the inside and removing casting flash so the spark plugs clear. They work great on the P heads. I also cut and modified the original 3spd shifter to bolt onto the T5, sits perfectly in the factory spot. My car is a '68, so YMMV

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post #19 of 37 (permalink) Old 04-13-2017, 08:34 AM
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Here's my GT40P posing as a 289 for my 66. I'm running a points distributor that I changed the gear on. The cam is a Mustang 5.0 along with Crane Cobra 1.72 rocker arms. Even the stock A&C code exhaust manifolds can to be made to work pretty easily. Go back in this thread and look at my link in post #6.


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Last edited by Huskinhano; 04-13-2017 at 08:36 AM.
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post #20 of 37 (permalink) Old 04-16-2017, 06:53 AM Thread Starter
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What are the latest years and vehicles which may have a useable 5.0 roller engine?

These longblocks can be used as is (with, of course, the necessary oil pan, water pump etc.) with a cam swap and get good results?
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post #21 of 37 (permalink) Old 04-16-2017, 10:52 AM
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Quote:
Originally Posted by rose62 View Post
What are the latest years and vehicles which may have a useable 5.0 roller engine?

These longblocks can be used as is (with, of course, the necessary oil pan, water pump etc.) with a cam swap and get good results?

The last year I believe is the 2001 Explorer with the GT40P. My GT40P is a 1997 but the same motor. I have a 91 Mustang 5.0 roller cam with 1.72 rockers. I think it runs pretty good. The stock P cam has just a few degrees less duration on the intake that's the big difference. I think the stock P cam with the 1.72 rockers would be a great combination as well. The P head breaths a lot better then the typical and head. My car doesn't fall on its face like the old motor did once the revs climb. If I had 3.25's instead of the 2.8's right now, it would be a lot of fun. But it's no slouch right now.

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post #22 of 37 (permalink) Old 04-16-2017, 09:15 PM
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'85 HO in a '66:
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File Type: jpg Engine Compartment.jpg (69.1 KB, 27 views)
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post #23 of 37 (permalink) Old 04-17-2017, 04:17 AM Thread Starter
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How does it perform, Woodchuck?
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post #24 of 37 (permalink) Old 04-18-2017, 08:35 AM Thread Starter
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I've done some searches locally and have found several 5.0 Explorer engines (2000-'01) with less than 150K miles in the $500 range. Would these be good candidates?

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post #25 of 37 (permalink) Old 04-18-2017, 09:43 AM
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Roller 5.0 into a '66

I have a full roller 5.0 with GT40 heads (not the p heads) in my 67. Just treat it like a 289 except for the firing order and maybe the balancer. I used my balancer from my 289 and has the entire motor balanced to that.

It's essentially the same block as your 289/302, everything bolts right up with the exception of changing the oil dipstick hole.

Run a 289 timing cover and you can use an original style water pump.

I have a Weiand Stealth intake, 220/.495 cam, full roller rockers, GT40 heads, tri y exhaust, a well-tuned Holley 600 and electronic ignition and it's a real torky car. Will easily do a burnout and my favorite thing to do with an unsuspecting passenger while driving is to just hammer it. LOL. The smile on their face is always priceless.


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67 coupe with 5.0 and C4 (Viper GTS Blue, paint code PBE, since everybody asks)
69 Mach 1 428 SCJ drag pack
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post #26 of 37 (permalink) Old 04-18-2017, 09:43 AM
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That seems to be about the average going price for them. Even with that mileage there's a lot of life left in them. Sometimes you can find the whole truck that's been wrecked but running for not too much more sometimes. A guy on Bangshift went this route for a Motor for his 79 Mustang. He said is was a bear removing the motor though.

You may be able to sell off the intake manifold, it's a pretty good set up but even that market is drying up a little bit.

The later GT40P versions run pretty well but have the different plug angle. They make slightly more power then the GT40 version but the GT40 has the regular plug angle and will work with regular headers. You just need to be a little more particular in picking headers for the P motor.

Tom

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post #27 of 37 (permalink) Old 04-18-2017, 09:59 AM Thread Starter
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As for exhaust, I'll be sticking with manifolds.

And the mileage on the engine, assuming that I'm starting with a fairly healthy engine, won't be too much of an issue. If a 302 is well maintained one can easily get 200K and I'm not going to put 50K miles on a '66 in twenty years.

So with a 5.0 with GT40 heads, it sounds like I stick a cam in it and a 4V and intake and I should be good to go, being aware of the differences in oil pump pickup location and dizzy gear?
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post #28 of 37 (permalink) Old 04-18-2017, 10:44 AM
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Roller 5.0 into a '66

Bring $300 cash and be prepared to take an engine home. I would recommend an engine cradle but a used tire under the oil pan works in a pinch.

My GT40P disguised as a 65 289 4v with a/c and engine dress up package mated to sn95 T5. Both picked off local classified ads. $200 for motor, $400 for tranny/bellhousing:

















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Last edited by Riley; 04-18-2017 at 10:50 AM.
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post #29 of 37 (permalink) Old 04-18-2017, 01:02 PM
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If you're sticking to the stock exhaust manifolds, the GT40P will work fine even with the different plug angle. You will need to some grinding, mostly on #8 but nothing really hard or bad. On 5,6&7 just some really minor grinding, mostly just removing casting flash at the seam. The stock cam will work pretty well. I wouldn't go more then the Mustang 5.0 cam unless you change the valve springs. Just leave the stock cam in and you'll be fine

You need the 289 style oil pick up. Buy a new one, they're cheap enough.

Tom

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post #30 of 37 (permalink) Old 04-18-2017, 04:14 PM Thread Starter
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I wouldn't swap cams without the recommended springs.
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