335 HP 396 290 Head Casting Build & Dyno Test - Page 4

goinbroke2 · 06-07-2024, 09:45 PM

Certainly more qualified than me! I have a bunch of pictures i have to resize then i?ll post but be ready to be not impressed, lol.

Learning a lot following threads like this!

Chipper Chapman · 07-01-2024, 05:11 PM

This is the combo I use in my Chevelle. I?ve been working it at a few years and have it down to 330 in that body with automatic. I believe it?s 335-340 in Camaro/nova still

Larry Hill · 07-01-2024, 07:53 PM

Lots of ways to go fast!

HP HUNTER · Yesterday, 11:02 PM

Ok- so I finished the heads and started looking at the short block. The original plan was to run the reworked heads on the short block as delivered, but I wasn't happy with the short block and have started the rebuild on that. The dyno sheets I received with the engine showed a best of 441 HP I believe, I can post them if anyones interested, which sounds just right considering what the car ran. So what I found when the pan came off was stock GM rods with NHRA legal pistons with a standard ring pack, quite a bit of drag, the block was filled, .009 piston to wall clearance, a GM big truck pan with a crank scraper and a full length windage tray. Compression was way low considering what's allowed, probably 1/2 of a point, and then the offset head dowel pins and the butchered intake that goes along with that. On a good note the engine had an aluminum hub ATI balancer. So maybe we can get a nice performance gain, so I will go though the short block and get it together and run it on the dyno, then track test it in my F/SA Chevelle, and all by the time the air changes this fall.

06-07-2024, 09:45 PM	#31
goinbroke2 Senior Member Join Date: Mar 2002 Location: NS CANADA Posts: 754 Likes: 736 Liked 205 Times in 79 Posts	Re: 335 HP 396 290 Head Casting Build & Dyno Test Certainly more qualified than me! I have a bunch of pictures i have to resize then i?ll post but be ready to be not impressed, lol. Learning a lot following threads like this! __________________ Jim Miller 103 U/SA

07-01-2024, 05:11 PM	#32
Chipper Chapman Member Join Date: Jan 2004 Location: Belmont N.S. Canada Posts: 461 Likes: 222 Liked 144 Times in 65 Posts	Re: 335 HP 396 290 Head Casting Build & Dyno Test This is the combo I use in my Chevelle. I?ve been working it at a few years and have it down to 330 in that body with automatic. I believe it?s 335-340 in Camaro/nova still __________________ Chris Chapman 1969 Chevelle NHRA F-G/SA 1090

07-01-2024, 07:53 PM	#33
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,356 Likes: 1,696 Liked 9,679 Times in 2,015 Posts	Re: 335 HP 396 290 Head Casting Build & Dyno Test Lots of ways to go fast! __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

Yesterday, 11:02 PM	#34
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 631 Likes: 72 Liked 281 Times in 111 Posts	Re: 335 HP 396 290 Head Casting Build & Dyno Test Ok- so I finished the heads and started looking at the short block. The original plan was to run the reworked heads on the short block as delivered, but I wasn't happy with the short block and have started the rebuild on that. The dyno sheets I received with the engine showed a best of 441 HP I believe, I can post them if anyones interested, which sounds just right considering what the car ran. So what I found when the pan came off was stock GM rods with NHRA legal pistons with a standard ring pack, quite a bit of drag, the block was filled, .009 piston to wall clearance, a GM big truck pan with a crank scraper and a full length windage tray. Compression was way low considering what's allowed, probably 1/2 of a point, and then the offset head dowel pins and the butchered intake that goes along with that. On a good note the engine had an aluminum hub ATI balancer. So maybe we can get a nice performance gain, so I will go though the short block and get it together and run it on the dyno, then track test it in my F/SA Chevelle, and all by the time the air changes this fall.