351M or 400 question
Senior User
Joined: Apr 2004
Posts: 259
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From: Eastern Ohio
Standard Abrasives 260001 - Standard Abrasives Deluxe Porting Kits - summitracing.com
Here's a link to get started.
Here's a link to get started.
Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
Beheind the valve seats, on the exhaust side, he have something you want to see why the passage of the burn exhaust gaz have a kind of restriction flow. Porting idea came in mind beleive me ! but don't go crazy, it's just for better flow.
Everybody have there personnal porting touch but i recommend at least a port match with gasket. That will be a begening.
Buy the kit, remove the heads, kept (but tell us) your tricks !
Everybody have there personnal porting touch but i recommend at least a port match with gasket. That will be a begening.
Buy the kit, remove the heads, kept (but tell us) your tricks !
Posting Guru
Joined: Jul 2006
Posts: 1,354
Likes: 1
From: America
if you only want 250-350 hp stock heads will be fine without porting them. get tmi pistons to increase pistons if you have a 400. the cam should be in the 255-265 deg of duration at .050" of lift and the cam company should be able to recomend springs for your cam. the intake you want is the one you said or the edelbrock performer. a vacuum secondary holley or edelbrock with 600-650 cfm will do.
Posting Guru
Joined: Jul 2007
Posts: 1,355
Likes: 1
I tested((theoreticly) several cams on stock head flow, most of them comp cams, the biggest cam you can use on a stock head and still benefit would be a xe274h, with a good cr you could reach 400hp with it, no porting...
Im guessing that by 255-265 you mean seat to seat duration not .050"...
So how that nice truck of yours running with the 410?
Im guessing that by 255-265 you mean seat to seat duration not .050"...
So how that nice truck of yours running with the 410?
Thread Starter
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Fleet Mechanic
Joined: Jun 2007
Posts: 1,931
Likes: 2
From: Ohio
I tested((theoreticly) several cams on stock head flow, most of them comp cams, the biggest cam you can use on a stock head and still benefit would be a xe274h, with a good cr you could reach 400hp with it, no porting...
Im guessing that by 255-265 you mean seat to seat duration not .050"...
So how that nice truck of yours running with the 410?
Im guessing that by 255-265 you mean seat to seat duration not .050"...
So how that nice truck of yours running with the 410?
400hp with just the certain cam and what i listed without the porting??
Posting Guru
Joined: Jul 2006
Posts: 1,354
Likes: 1
From: America
I tested((theoreticly) several cams on stock head flow, most of them comp cams, the biggest cam you can use on a stock head and still benefit would be a xe274h, with a good cr you could reach 400hp with it, no porting...
Im guessing that by 255-265 you mean seat to seat duration not .050"...
So how that nice truck of yours running with the 410?
Im guessing that by 255-265 you mean seat to seat duration not .050"...
So how that nice truck of yours running with the 410?
Posting Guru
Joined: Jul 2006
Posts: 1,354
Likes: 1
From: America
400hp is possible but you would have to run some big parts that a truck wont like such as a big cam, a big single plane intake, high compression and things that you wouldnt want in a truck. 350hp is a realistic goal that will give you the torque you want and can feel with the 400(m) and stock heads when its in a 5500 pound vehicle.
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Thread Starter
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Fleet Mechanic
Joined: Jun 2007
Posts: 1,931
Likes: 2
From: Ohio
400hp is possible but you would have to run some big parts that a truck wont like such as a big cam, a big single plane intake, high compression and things that you wouldnt want in a truck. 350hp is a realistic goal that will give you the torque you want and can feel with the 400(m) and stock heads when its in a 5500 pound vehicle.
haha ok so 350 is achieveable with what i have listed to do? and how much torque do you thing? 400-450?
Posting Guru
Joined: Jul 2007
Posts: 1,355
Likes: 1
yeah you could build a good engine on 87 on even stock heads, a better one with quench and an even better one with aluminium heads... mine has 399hp with stock heads and 0 decked pistons, it runs good on 89 with 10:1 cr/8:1 dcr..
Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
piston to chose ???
For my first rebuilt i use stock pistons style(but 30 over silvolite cast piston) with aussie heads . One of my freind rebuilt a 350 with silvolite pistons and break everything on it first ride! (i know it's a chevy lol) He told me to not use those pistons .
The stock .030 FORD 400 pistons is allready install and still on the engine stand but only the crank, pistons, cam and double timing chain is in it for now. I want to use tim piston for aussie head... Did the stock style pistons will break or will be fine ??? I know it's not to late to make the move but i'm worry if stock style is throwing away money in the garbadge or i'm ok with that???
It's gonna be in light weight 81 mustang. I try on mustang forum but nobody install a 408 in a stang and i know you guy's have a way beter knowledge for the 351m/c and 400 than everybody else
Every comment will be apreciate, thanks.
The stock .030 FORD 400 pistons is allready install and still on the engine stand but only the crank, pistons, cam and double timing chain is in it for now. I want to use tim piston for aussie head... Did the stock style pistons will break or will be fine ??? I know it's not to late to make the move but i'm worry if stock style is throwing away money in the garbadge or i'm ok with that???
It's gonna be in light weight 81 mustang. I try on mustang forum but nobody install a 408 in a stang and i know you guy's have a way beter knowledge for the 351m/c and 400 than everybody else
Every comment will be apreciate, thanks.
Posting Guru
Joined: Jul 2006
Posts: 1,354
Likes: 1
From: America
tmi pistons will give you the correct compression and have the flat top portion of the piston where the quench part of the combustion chamber is. this "squish" will give you better fuel atomization and take advantage of the closed chamber.