hucklburry
Well-known member
First post, love this site, Thank you.
I have a 66 Bronco, I believe it is the original engine, 170. It sat for 10 years, I have it running, but had a ticking noise under the valve cover, pulled the cover, and found #2 cylinder and #5 each had 1 pushrod not in the rocker arm, they were laying over to the side, still in the hole. #5 was bent, the top 1" of the pushrod, #2 seems fine, but I am going to get 2 new pushrods.
The lifters are moving, not stuck, I am assuming it got so far out of adjustment it let the pushrods get out, or maybe I over-revved it and floated some valves? Anything to check while I am fixing it, feel free to speak up.
My problem is, all the on-line sources except CI have the pushrod length at 8.23" or so. This is mechanical/solid lifters and adjustable rockers.
A good one of mine measures 8.030", ball and cup, 5/16". CI has that 8.030" as an option, but no where else does, not napa, oreilly, etc. Now just to be clear, I measured with a tape measure, and a metal square ruler, it falls between 8-1/16" (8.0625") and 8" even, so I am going with the 8.030" from CI.
SO:
Is there a p/n for the 8.030" length?
Does this mean my engine has had work, heads milled, maybe alot? It shows 91K miles, seems realistic from the other wear (this Bronco is pretty nice) but who knows. It is still LOM carb, 3 on the tree, etc, just cut rear with old school rancho lift and 31s. It came with the original spare tire on the original spare rim.
I used this site quite a bit to make sure everything is working, rebuilt the carb, LOM is working, vacuum advance works, set initial timing unplugged at 12*btdc and it advances when plugged back in, etc.
My imediate intentions are to drive it for the summer as is, and I believe it will run nicely, and long term I think I want to keep it a 170 but improve drivability with duraspark/header/carb or EFI. I would love to do 1.6 rockers while I am doing this, but for this engine it is kind of pricey.
Thank you for the help! --Jim
I have a 66 Bronco, I believe it is the original engine, 170. It sat for 10 years, I have it running, but had a ticking noise under the valve cover, pulled the cover, and found #2 cylinder and #5 each had 1 pushrod not in the rocker arm, they were laying over to the side, still in the hole. #5 was bent, the top 1" of the pushrod, #2 seems fine, but I am going to get 2 new pushrods.
The lifters are moving, not stuck, I am assuming it got so far out of adjustment it let the pushrods get out, or maybe I over-revved it and floated some valves? Anything to check while I am fixing it, feel free to speak up.
My problem is, all the on-line sources except CI have the pushrod length at 8.23" or so. This is mechanical/solid lifters and adjustable rockers.
A good one of mine measures 8.030", ball and cup, 5/16". CI has that 8.030" as an option, but no where else does, not napa, oreilly, etc. Now just to be clear, I measured with a tape measure, and a metal square ruler, it falls between 8-1/16" (8.0625") and 8" even, so I am going with the 8.030" from CI.
SO:
Is there a p/n for the 8.030" length?
Does this mean my engine has had work, heads milled, maybe alot? It shows 91K miles, seems realistic from the other wear (this Bronco is pretty nice) but who knows. It is still LOM carb, 3 on the tree, etc, just cut rear with old school rancho lift and 31s. It came with the original spare tire on the original spare rim.
I used this site quite a bit to make sure everything is working, rebuilt the carb, LOM is working, vacuum advance works, set initial timing unplugged at 12*btdc and it advances when plugged back in, etc.
My imediate intentions are to drive it for the summer as is, and I believe it will run nicely, and long term I think I want to keep it a 170 but improve drivability with duraspark/header/carb or EFI. I would love to do 1.6 rockers while I am doing this, but for this engine it is kind of pricey.
Thank you for the help! --Jim