SO Piston Recommendations/Thoughts

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Post  FalconEh on Mon 16 May - 20:54

Street/Strip FRPP 4.3/2.5/6.605 stroker kit SCJB heads, D9TE less than 500 Nitrous (strip) Victor/1050 Dommi CM-6250-A514 roller, 1.8 RAR, drag week style build will be streeted and needs to run on pump gas + small fuel cell for nitrous. It appears the blocks I have will not clean up tight enough at .030 for the included -28cc pistons so I could acquire another block, but I am thinking I can go to 4.42 and maybe increase the cu/in and improve the quench with something more D shaped than the full dish FRPP pistons. Also thinking I can go -18cc for around an mid 11CR


Last edited by FalconEh on Tue 24 May - 20:55; edited 1 time in total
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Post  rmcomprandy on Mon 16 May - 23:04

FalconEh wrote:Street/Strip FRPP 4.3/2.5/6.605 stroker kit SCJB heads, D9TE less than 500 Nitrous (strip) Victor/1050 Dommi CM-6250-A514 roller, 1.8 RAR, drag week style build will be streeted and needs to run on pump gas + small fuel cell for nitrous. It appears the blocks I have will not clean up tight enough at .030 for the included -28cc pistons so I could acquire another block, but I am thinking I can go to 4.42 and maybe increase the cu/in and improve the quench with something more D shaped than the full dish FRPP pistons. Also thinking I can go -18cc for around an mid 11CR

You need to make some decisions regarding the actual compression ratio you want and how much money you are willing to spend.

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Post  gt350hr on Tue 17 May - 9:50

For 500 hp of NOS make sure the piston is 2618 alloy and the ring lands are spaced accordingly. Quench is more important on iron heads than the modern aluminum designs. Detonation damage is usually brought on by "tune up" , not quench related conditions seen in NA engines. Pressurized NOS and extra fuel enhances "mixture motion" beyond the NA conditions.

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Post  Dave De on Tue 17 May - 11:32

D9 blocks are still in cheap abundance. Considering that you have the stroker kit go find another block that will go plus .030 this will save you money.
A pump gas build with 500 hose is a bit extreme. If you keep your block and can clean up at .040 that will be much better than going .060
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Post  John Myrick on Tue 17 May - 14:04

500 hp pump gas build is relatively easy these days
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Post  FalconEh on Tue 17 May - 19:23

rmcomprandy wrote:
FalconEh wrote:Street/Strip FRPP 4.3/2.5/6.605 stroker kit SCJB heads, D9TE less than 500 Nitrous (strip) Victor/1050 Dommi CM-6250-A514 roller, 1.8 RAR, drag week style build will be streeted and needs to run on pump gas + small fuel cell for nitrous. It appears the blocks I have will not clean up tight enough at .030 for the included -28cc pistons so I could acquire another block, but I am thinking I can go to 4.42 and maybe increase the cu/in and improve the quench with something more D shaped than the full dish FRPP pistons. Also thinking I can go -18cc for around an mid 11CR

You need to make some decisions regarding the actual compression ratio you want and how much money you are willing to spend.

Actual 11-ish will stay below 7000rpm -22 for 11.07 may be more reasonable than -18, willing to spend more if alterations, coatings etc. are going to contribute to a better performing more reliable package.

gt350hr wrote:    For 500 hp of NOS make sure the piston is 2618 alloy and the ring lands are spaced accordingly. Quench is more important on iron heads than the modern aluminum designs. Detonation damage is usually brought on by "tune up" , not quench related conditions seen in NA engines. Pressurized NOS and extra fuel enhances "mixture motion" beyond the NA conditions.

below 500, yes sir 2618 alloy, tune thanks.

Dave De wrote:D9 blocks are still in cheap abundance. Considering that you have the stroker kit go find another block that will go plus .030 this will save you money.
A pump gas build with 500 hose is a bit extreme. If you keep your block and can clean up at .040 that will be much better than going .060

Right on point, I have been watching for blocks for a few months but they are not popping up in my area, I could junk an early-mid 80's 460 powered greasy rust bucket but would prefer just a block or a short block or buy pistons. I have one that will clean up at .040 and 523 is ok, likely keep it to 350 and under on the hose but want a little margin built in for that set on kill situation.

John Myrick wrote:500 hp pump gas build is relatively easy these days

Bottle, plate and 4-solenoids lol
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Post  FalconEh on Tue 24 May - 21:05

No need to look for pistons or a D9 block any more, I bought a long block with trans a few years ago and the seller thought it was a 473" but it had a 700 holley and a dual plane intake so I wasn't so sure so I decided to tear it down this weekend and never have I been as happy to see it was only .020 over with hyper pistons LOL. It did have adjustable DOVE heads, roller rockers (new) C9AE-B rods, and a CJ C6 W/ new converter, so I did not lose on the deal anyway but I now have the needed block, it looks good and should be no problem being serviceable at .030
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Post  Dave De on Tue 24 May - 21:32

COOL over the top.
How high are you going to spin this?
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Post  FalconEh on Tue 24 May - 21:41

Dave De wrote:COOL over the top.
How high are you going to spin this?

I want to keep it under 7000 more like 6700 or less, need to get the bat out and grow the tire a bit the gears may be too tall.
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