Back firing

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superbond
Registered Member
Posts: 175
Joined: 17 Feb 2017, 06:03

Re: Back firing

Post by superbond » 15 Apr 2018, 20:47

1969XR7Vert wrote:
15 Apr 2018, 14:59
superbond wrote:
14 Apr 2018, 09:22
Reading my service manual it does say the rocker arms can be over tightened. But it says the 351 HO motors. Mines is not an HO. Does this matter. Could I have over tightened the rocker arms and if so how do I fix this?
The Boss 351's had adjustable valvetrain, I believe that is what you are referring to (and no, it does not apply to your engine if you have 5/16" bolt down rocker arm fulcrums.
Thanks for the reinsurance

Gyrhead
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Joined: 04 Dec 2012, 18:04
Location: New Hampshire
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Re: Back firing

Post by Gyrhead » 16 Apr 2018, 06:11

Double check the tightness of header bolts and collector flanges (or manifolds if so equipped). Exhaust leaks can also cause a backpop through the exhaust. Simple and easy to check.
1971 Cougar XR-7 Convertible 351C 4V, 4 speed (medium well done 😥)
2016 Mustang GT350 Chassis #2710
1988 Mustang 5.0 LX Coupe
2002 Porsche 911 3.6 Carrera
2017 Honda Civic Si
2017 VW Jetta GLI
2013 VW GTI (Unitronic Stage 1+ tune 260 HP / 295 ft/lbs - second fastest car in the fleet)

superbond
Registered Member
Posts: 175
Joined: 17 Feb 2017, 06:03

Re: Back firing

Post by superbond » 16 Apr 2018, 15:13

Ok I check it out and let you know. Thanks

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