350 - 270 Combo Horsepower - Page 4

gsa612 · 06-23-2015, 11:37 AM

The 287 manifold would be considered "flat"compared to a 68-69 396/325 (shown).There not as restrictive as you may think,as the 71' 454/365 Chevelles and Corvettes use it,with 50+ more ci.and the same cyl. head (#820). gsa612

Dwight Southerland · 06-23-2015, 02:06 PM

This is flat : '72 up manifold.

gsa612 · 06-23-2015, 04:26 PM

In '72 it gets screwed up,you have to run that ^^ flat intake (#753),and head #'s 241 or 292. In '71 you have to run the 287 manifold (semi-flat lol..) with a choice of head #'s 820,241,292, with the 820 being the best.Both years are factored at 315 hp. I can't see why the '72 can't also run the 820 casting along with the other two. If anything the 72 combo should allow the 820 head and drop 10 hp to 305 in rating because of the lower more restrictive intake.Then you might have something,as all other components (cam lift,pistons etc.) are the same. gsa612

Doug McCue · 06-23-2015, 06:08 PM

Quote:

Originally Posted by rick winchester

I hate to get into a pi%%ing contest on which engine is better . that being said anyone who thinks a 402/315 is better than a 350/270 is mistaken. If I am wrong someone needs to notify Demarzo,Johnny Gray and Sepanek so they will quit wasting their money and time running them. This is just one guys opinion ,I can say that the 402/315 is way to high. 280 to 285 would be a lot closer in stock. SuperStock is a different story. Oh by the way I run the 350/270 @278 not 270. Rick.

Big blocks as a whole are rated way to high as far as hp is concerned

06-23-2015, 11:37 AM	#31
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 570 Likes: 116 Liked 280 Times in 139 Posts	Re: 350 - 270 Combo Horsepower The 287 manifold would be considered "flat"compared to a 68-69 396/325 (shown).There not as restrictive as you may think,as the 71' 454/365 Chevelles and Corvettes use it,with 50+ more ci.and the same cyl. head (#820). gsa612 Attached Thumbnails Last edited by gsa612; 06-23-2015 at 11:57 AM.

06-23-2015, 02:06 PM	#32
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,983 Likes: 54 Liked 726 Times in 177 Posts	Re: 350 - 270 Combo Horsepower This is flat : '72 up manifold. __________________

06-23-2015, 04:26 PM	#33
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 570 Likes: 116 Liked 280 Times in 139 Posts	Re: 350 - 270 Combo Horsepower In '72 it gets screwed up,you have to run that ^^ flat intake (#753),and head #'s 241 or 292. In '71 you have to run the 287 manifold (semi-flat lol..) with a choice of head #'s 820,241,292, with the 820 being the best.Both years are factored at 315 hp. I can't see why the '72 can't also run the 820 casting along with the other two. If anything the 72 combo should allow the 820 head and drop 10 hp to 305 in rating because of the lower more restrictive intake.Then you might have something,as all other components (cam lift,pistons etc.) are the same. gsa612 Last edited by gsa612; 06-23-2015 at 08:58 PM.