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402 Magnum Crate engine #3193865 11/28/23 11:59 AM 11/28/23 11:59 AM
Joined: Mar 2005 Posts: 1,550 Michigan K Kiddart OP pro stock
Kiddart OP pro stock K Joined: Mar 2005 Posts: 1,550 Michigan	Hi Moparts community. I have a Magnum create engine the 402 magnum. it is advertised at 9.5/9.75 to 1, pending where you are getting the info. I would like to wake it up just a little. if i changed the head gaskets to something just a little thinner would i be able to get around 10.5 to 1. and is the work going to be worth the effort. I can't find too much on this motor as they don't make the motor any more out of the catalog. I am trying to find the thickness of the current head gasket. the car is a streetcar just a little on the slow side for my liking. it ran 12.50 this last fall at Ubly Dragway. I don't really want to pull the motor apart to get very little gains. It is a really nice car and cruiser. Thank you Kiddart

Re: 402 Magnum Crate engine [Re: Kiddart] #3193875 11/28/23 12:38 PM 11/28/23 12:38 PM
Joined: Dec 2013 Posts: 4,669 Wichita G GY3 master
GY3 master G Joined: Dec 2013 Posts: 4,669 Wichita	Originally Posted by Kiddart Hi Moparts community. I have a Magnum create engine the 402 magnum. it is advertised at 9.5/9.75 to 1, pending where you are getting the info. I would like to wake it up just a little. if i changed the head gaskets to something just a little thinner would i be able to get around 10.5 to 1. and is the work going to be worth the effort. I can't find too much on this motor as they don't make the motor any more out of the catalog. I am trying to find the thickness of the current head gasket. the car is a streetcar just a little on the slow side for my liking. it ran 12.50 this last fall at Ubly Dragway. I don't really want to pull the motor apart to get very little gains. It is a really nice car and cruiser. Sounds like a prime candidate for a 150 shot of nitrous! '63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.

Re: 402 Magnum Crate engine [Re: Kiddart] #3193878 11/28/23 12:45 PM 11/28/23 12:45 PM
Joined: Jan 2003 Posts: 4,048 Shelby Twp. Mi HardcoreB master
HardcoreB master Joined: Jan 2003 Posts: 4,048 Shelby Twp. Mi	Some of those crate engines made pretty good power so, if you want to pick up ET you might look at the rest of the car (converter etc) There might be some low hanging fruit in the parts you have like a bowl blend and minor cam change along with getting the compression as good as pump gas would allow (by optimizing quench) maybe take the sharp edges off anything in both sides of the chamber while it's apart.

Re: 402 Magnum Crate engine [Re: HardcoreB] #3193889 11/28/23 01:17 PM 11/28/23 01:17 PM
Joined: May 2005 Posts: 1,973 Apollo, PA. B1MAXX top fuel
B1MAXX top fuel Joined: May 2005 Posts: 1,973 Apollo, PA.	going from 9.5 to 10 wouldn't be on my list of worth the effort changes.

Re: 402 Magnum Crate engine [Re: B1MAXX] #3193927 11/28/23 03:06 PM 11/28/23 03:06 PM
Joined: Jan 2003 Posts: 20,520 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,520 Eagle, Idaho	Get the heads ported?

Re: 402 Magnum Crate engine [Re: Neil] #3193947 11/28/23 04:14 PM 11/28/23 04:14 PM
Joined: Jan 2003 Posts: 21,643 San Jose,CA migsBIG YouTube is my go-to news source
migsBIG YouTube is my go-to news source Joined: Jan 2003 Posts: 21,643 San Jose,CA	Intake change, cam swap and upgraded electronics might be worth looking into first. [IMG]http://i130.photobucket.com/albums/p265/migsbig/Hippo_skull_dark-1.jpg[/IMG]

Re: 402 Magnum Crate engine [Re: migsBIG] #3194094 11/29/23 08:20 AM 11/29/23 08:20 AM
Joined: May 2019 Posts: 162 W. Pa U usp4u member
usp4u member U Joined: May 2019 Posts: 162 W. Pa	The 402 has the Big Valve R/T head. That head responds well to porting. 305cfm is achievable.

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