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odd ball question of the day. #713011 06/01/10 09:40 AM 06/01/10 09:40 AM
Joined: Jan 2008 Posts: 417 jamestown, ny 71scamp440 OP Hinged
71scamp440 OP Hinged Joined: Jan 2008 Posts: 417 jamestown, ny	my boss has a 73 duster that he drag races . has a 400 block stroked to a 472. its an alcohol motor. now the problem he is having is new to me . after 3 1/8th mile passes the intake valley pan split down the middle. its about a 7in crack right down the center . this is one of the most bizzare thing ive ever ran into. any ideas on this one??? Last edited by 71scamp440; 06/01/10 11:18 AM. 71 scamp big block with 915 heads 727 trans

Re: odd ball question of the day. [Re: 71scamp440] #713012 06/01/10 11:23 AM 06/01/10 11:23 AM
Joined: Jan 2003 Posts: 28,067 Irving, TX feets Senior Management
feets Senior Management Joined: Jan 2003 Posts: 28,067 Irving, TX	I've had a few of them split on me too. It's caused by pressure inside the crank case. The pan flexes up and down until it fatigues and splits along one of the creases. You're probably getting a lot of blow by or don't have the engine properly vented. We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon

Re: odd ball question of the day. [Re: 71scamp440] #713013 06/01/10 11:27 AM 06/01/10 11:27 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: my boss has a 73 duster that he drag races . has a 400 block stroked to a 472. its an alcohol motor. now the problem he is having is new to me . after 3 1/8th mile passes the intake valley pan split down the middle. its about a 7in crack right down the center . this is one of the most bizzare thing ive ever ran into. any ideas on this one??? Pretty simple really... he is pressurizing the engine with blow by... the crank case is building pressure from the air passing the rings... put a gauge on a valve cover to measure the pressure... a vac pump will eliminate/correct the problem

Re: odd ball question of the day. [Re: 71scamp440] #713014 06/01/10 11:55 AM 06/01/10 11:55 AM
Joined: Jan 2008 Posts: 417 jamestown, ny 71scamp440 OP Hinged
71scamp440 OP Hinged Joined: Jan 2008 Posts: 417 jamestown, ny	i guess this is more common then i thought. thanks for the info guys. i will pass on your info on to my boss and hopefully he will be able to run a full day with out covering his windshield with oil. 71 scamp big block with 915 heads 727 trans

Re: odd ball question of the day. [Re: 71scamp440] #713015 06/01/10 12:33 PM 06/01/10 12:33 PM
Joined: Sep 2009 Posts: 928 NC S SLOW67 super stock
SLOW67 super stock S Joined: Sep 2009 Posts: 928 NC	My brothers old hi comp. 440 would do that. We put the header evac on it and it quit

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