Summit racing pistons
Thread Starter
Racer
Joined: Jan 2010
Posts: 367
Likes: 1
From: Christchurch Canterbury
Summit racing pistons
I have just bought a 69, the previous owner had recently rebuilt the engine. He has used Summitt racing hyper flat top pistons.
#sum-17350-60
I believe these will give me 9.8:1 with 64cc heads
How terrible or not are these pistons? The block is no origional 2 bolt and has been bored .60 over., so figued I would just run it, not worth replacing pistons on a 60 over 2 bolt.
He had replaced the crank with a new scat cast crank, std rods.
I do plan to replace the short block, when budget allows.
I have bought some AFR 195s and and a cam (282s, comp)to give it a wake up before I build a 383 short block.....but I dont want to risk damage to my new heads if these pistons are junk.!
Has anyone used these pistons, experences?
Thanks
Richie
#sum-17350-60
I believe these will give me 9.8:1 with 64cc heads
How terrible or not are these pistons? The block is no origional 2 bolt and has been bored .60 over., so figued I would just run it, not worth replacing pistons on a 60 over 2 bolt.
He had replaced the crank with a new scat cast crank, std rods.
I do plan to replace the short block, when budget allows.
I have bought some AFR 195s and and a cam (282s, comp)to give it a wake up before I build a 383 short block.....but I dont want to risk damage to my new heads if these pistons are junk.!
Has anyone used these pistons, experences?
Thanks
Richie
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
I have just bought a 69, the previous owner had recently rebuilt the engine. He has used Summitt racing hyper flat top pistons.
#sum-17350-60
I believe these will give me 9.8:1 with 64cc heads
How terrible or not are these pistons? The block is no origional 2 bolt and has been bored .60 over., so figued I would just run it, not worth replacing pistons on a 60 over 2 bolt.
He had replaced the crank with a new scat cast crank, std rods.
I do plan to replace the short block, when budget allows.
I have bought some AFR 195s and and a cam (282s, comp)to give it a wake up before I build a 383 short block.....but I dont want to risk damage to my new heads if these pistons are junk.!
Has anyone used these pistons, experences?
Thanks
Richie
#sum-17350-60
I believe these will give me 9.8:1 with 64cc heads
How terrible or not are these pistons? The block is no origional 2 bolt and has been bored .60 over., so figued I would just run it, not worth replacing pistons on a 60 over 2 bolt.
He had replaced the crank with a new scat cast crank, std rods.
I do plan to replace the short block, when budget allows.
I have bought some AFR 195s and and a cam (282s, comp)to give it a wake up before I build a 383 short block.....but I dont want to risk damage to my new heads if these pistons are junk.!
Has anyone used these pistons, experences?
Thanks
Richie
With performance builds I don't find many 010 blocks that will pass a sonic test and be safe and have good ring seal at .060
From what I have seen all 010 blocks need to be sonic tested before any work is done/
Thread Starter
Racer
Joined: Jan 2010
Posts: 367
Likes: 1
From: Christchurch Canterbury
I don't use Hyper pistons in the engines we build, But if you are conservative wit your tune up you should be fine.
With performance builds I don't find many 010 blocks that will pass a sonic test and be safe and have good ring seal at .060
From what I have seen all 010 blocks need to be sonic tested before any work is done/
With performance builds I don't find many 010 blocks that will pass a sonic test and be safe and have good ring seal at .060
From what I have seen all 010 blocks need to be sonic tested before any work is done/
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Last edited by 63mako; Mar 26, 2010 at 12:34 AM.
Thread Starter
Racer
Joined: Jan 2010
Posts: 367
Likes: 1
From: Christchurch Canterbury
HP don't kill the hyper pistons. Detonation does. The cam with compression 9.8 to 1 should be fine. Advance the timing too much or run lean and you could have problems. Those heads are a modern chamber and should run @ 32 degrees initial and mechanical timing. Don't push timing to 36.Your short block has a cast crank, stock rods and hyper pistons. That solid flat tappet would pull rpm past the capacity of the bottom end. It is a 6000 RPM redline build, just so you know. A rev limiter would be money well spent.
Forum advice tends to lean towards me needing a bigger cam to run with the AFR heads, on this short block. I was going to use a Isky Z30 or the old 30-30 comp cams grind, but thought I would lose to much vacum and put the power band to far above the current bottom end, appreciate your thoughts
Thanks Richie
