additional power
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additional power
I have a 1976 351m I am considering using temporarily while I collect parts to install the 400 I am building. Until the 410 ci is ready,how much power can I get from the 351m by simply adding the largest cam I can go with stock springs (probably 268), an after market nonretard timing chain set and an aluminum single plane intake, and 3" exhaust. I read the 1976 M's had 8.61 compression. It's an old engine however with about 140,000. Doesn't smoke though! Or, would these mods wear the engine out with so many miles.
PS- I'm only running the 3" exhaust to save time and trouble later once the 410 is ready.
"D"
PS- I'm only running the 3" exhaust to save time and trouble later once the 410 is ready.
"D"
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Joined: Mar 2003
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From: spartanburg, SC
i don't think you can go that big with stock springs. I would replace 140K mile springs with a cam swap anyway.
i'll find out how big of cam stock springs can handle.
heres what i would do on a build up.
400 crank
stock rods
flat top pistons for 9.5:1 CR (351C piston will work if you bush the stock rods)
mild-med head porting
255DEH or 265DEH comp cam
new valve springs and retainers
roller rockers
aftermarket intake
aftermarket ignition
600 CFM carb
headers
this should make about 375-400 hp and 450-500 tq is this enuff power?
BTW there are single plain intakes for the 351M/400.
i'll find out how big of cam stock springs can handle.
heres what i would do on a build up.
400 crank
stock rods
flat top pistons for 9.5:1 CR (351C piston will work if you bush the stock rods)
mild-med head porting
255DEH or 265DEH comp cam
new valve springs and retainers
roller rockers
aftermarket intake
aftermarket ignition
600 CFM carb
headers
this should make about 375-400 hp and 450-500 tq is this enuff power?
BTW there are single plain intakes for the 351M/400.
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Should be enough.....
I'm going to run efi on the 400 with non ported 4v heads. I'm going to use the MPG intake and exhaust plates. I have the 351c Torker intake that has been converted to accept injectors. I also have fabbed an adapter that will allow me to bolt a 86mm tb directly to the carb land.I'm going to custom fabb some type of scoop hood. It's going to draw air from the outside just like the shaker scoops of the old stangs. I was wanting to run a 292 Comp Magnum cam. My biggest problem is compression. I elected to run the KB pistons that only have one relief.My compression is calculated now at 10.6 with a deck clearance of .047. I was told the compression will be ok with efi. The computer will make the necessary advance/retard needs.Also, my chip is designed to run only high octane gas and the variables for it adjusted also. The highest octane available here at the pump is 93. However, I can run higher if need be. My '94 is a toy, along with my '69.
I'm going to run efi on the 400 with non ported 4v heads. I'm going to use the MPG intake and exhaust plates. I have the 351c Torker intake that has been converted to accept injectors. I also have fabbed an adapter that will allow me to bolt a 86mm tb directly to the carb land.I'm going to custom fabb some type of scoop hood. It's going to draw air from the outside just like the shaker scoops of the old stangs. I was wanting to run a 292 Comp Magnum cam. My biggest problem is compression. I elected to run the KB pistons that only have one relief.My compression is calculated now at 10.6 with a deck clearance of .047. I was told the compression will be ok with efi. The computer will make the necessary advance/retard needs.Also, my chip is designed to run only high octane gas and the variables for it adjusted also. The highest octane available here at the pump is 93. However, I can run higher if need be. My '94 is a toy, along with my '69.
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My '94 is not setup for the knock sensor. I think the '96 and after. Supposedly with the ECM variables, everything is "SUPPOSE" to be ok. You know how that goes though.I may just have to run higher octane.
With .047 deck clearance, I didn't think using a thick head gasket to reduce compression would be wise.I was hoping to get a better quench by reducing deck clearance, but this high compression piston is causing problems.I may consider having a valve relief cut for the intake. That may get me down to 10.1 or lower 9's with compression which will be good.
With .047 deck clearance, I didn't think using a thick head gasket to reduce compression would be wise.I was hoping to get a better quench by reducing deck clearance, but this high compression piston is causing problems.I may consider having a valve relief cut for the intake. That may get me down to 10.1 or lower 9's with compression which will be good.
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