Quick 351 question

[Chevy_Guy]

Going from a 302 to a 351. I realize the deck height is different so does this mean the intake has to be specific to a 351? Will the deck height being different make the gap between the intake ports, from left head to right head, greater? I have a 351 block here that was going to be for a different project but I am itching to use it on the current car. I want to stick with a 5.0 "style" EFI intake but does it have to be made for a 351?

 

[dsblk93gt]

Yep, intake manfold is different, headers are different, accessory brackets are different as well.

http://www.mustangforums.com/forum/351-mustang/104426-5-8-conversion.html

 

[Chevy_Guy]

Well thanks Dave. After reading that I have another qusetion that is not 351 specific. Do the injectors on the EFI fire one at a time or do they fire left bank, right bank?

 

[1990_LX]

You need a 351 lower, but you can use a 5.0 upper with it. Stroke that 5.8 into a 408.

 

[dsblk93gt]

Well thanks Dave. After reading that I have another qusetion that is not 351 specific. Do the injectors on the EFI fire one at a time or do they fire left bank, right bank?

They are sequential so they fire one at a time. And anytime!

 

[Chevy_Guy]

You need a 351 lower, but you can use a 5.0 upper with it. Stroke that 5.8 into a 408.

The 408 was the origional idea but both of the motor builders/machine shops that I talked to frowned upon using a 408 on the street. They had tried it in the past and had issues tunning them for street driving. It is looking like more like a 383 at the moment.

 

[dsblk93gt]

The 408 was the origional idea but both of the motor builders/machine shops that I talked to frowned upon using a 408 on the street. They had tried it in the past and had issues tunning them for street driving. It is looking like more like a 383 at the moment.

The camshaft has more to due with street-ability than the engine size. Technically you can run a larger cam with a bigger engine anyways. I have seen 408 cars at the track that were driven there and clicked off 10 second NA passes!

 

[Chevy_Guy]

They are sequential so they fire one at a time. And anytime!

I guess that means the ford EFI has one thing over the good old chevy TPI, lol.

 

[dsblk93gt]

I guess that means the ford EFI has one thing over the good old chevy TPI, lol.

LOL, no batch fire on the 5.0 HO although the trucks do have it in the non-HO 302.

 

[Chevy_Guy]

The camshaft has more to due with street-ability than the engine size. Technically you can run a larger cam with a bigger engine anyways. I have seen 408 cars at the track that were driven there and clicked off 10 second NA passes!

I agree but when I asked both Dave O'neal at DOM and Rick over at RPM they both said cams wern't the problem with the tuning. Rick is going to do the finish machine work on the block so when I bring it over to him I will ask him more about it.

 

[dsblk93gt]

I agree but when I asked both Dave O'neal at DOM and Rick over at RPM they both said cams wern't the problem with the tuning. Rick is going to do the finish machine work on the block so when I bring it over to him I will ask him more about it.

Maybe with carb they have issues?? IDK seems strange to me. I have never heard of such issues but I only really mess with EFI. Rick used to build my fathers circle track 302's.