335 HP 396 290 Head Casting Build & Dyno Test

[goinbroke2]

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]

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]

Lots of ways to go fast!

[HP HUNTER]

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.

[HP HUNTER]

The line hone is done, next the block will be decked, then TQ plate honed to .069 over.

[HP HUNTER]

Done and ready to dyno.

[427FE]

When does it go on the dyno? Good read!

[HP HUNTER]

Originally Posted by 427FE

When does it go on the dyno? Good read!

It's been to the dyno, the results were 486 HP @ 6300 RPM, up from 441 HP when I received the engine. When I went through the engine I tried to use as many of the original parts that came with the engine as possible. Its definitely down on power, and I believe this is due to the cam, I checked the lobe lift before I assembled the engine, which was where it should be, but what I didn't do is check the profile, which I believe does not have the duration it should, the cam and lifters looked good, but I think it knocked the corners of the lobes off, prior to my build. So from here it will get a steel cam with coated tool steel lifters.