Basic rebuild: What 306 piston with bigger valve reliefs and gives more compression?

[5spd GT]

Well some of you guys know me and my ideas. I thought about a pretty basic rebuild since my engine does have 163,000 on it and I'm sure their are things to be desired.

Anyways I'm running a pretty aggressive cam and the p-v clearance is close so I always wanted that piece of mind of bigger valve reliefs for inline heads (afr 165's). Also want a bit more compression to get a few more hp...I don't plan on boost anytime just real soon.

Suggestions? Keith Black? etc...?

Thanks for any suggestions

 

[Modular2v]

get probe pistons.....forged and really nice quality

 

[5spd GT]

Part numbers?

Thanks for the suggestion...I don't need to spend just a ton on a piston when the rest of the parts are going to be stock

 

[rd]

More compression is usually done with deck clearance and head milling or smaller chambers. If you are using a basic small block Ford style flattop, there is not much to be gained in compression between any that I have seen.

There are dished ones to lower compression for blowers.

If you want a compression increase with pistons, you are looking at domed pistons, which will get you up there quickly.

If you look through a piston catalog, such as the TRW/Sealed Power, you will see a lot of pistons, but the compression distance is nearly identical.

Careful decking and head milling are the best bets.

 

[5spd GT]

More compression is usually done with deck clearance and head milling or smaller chambers. If you are using a basic small block Ford style flattop, there is not much to be gained in compression between any that I have seen.

There are dished ones to lower compression for blowers.

If you want a compression increase with pistons, you are looking at domed pistons, which will get you up there quickly.

If you look through a piston catalog, such as the TRW/Sealed Power, you will see a lot of pistons, but the compression distance is nearly identical.

Careful decking and head milling are the best bets.

I appreciate the response Yeah I could get a piston with deeper (wider) valve reliefs and then have the block decked and afr's milled. How would I know how much to do it?

 

[Rick 91GT]

PROBE 302 - 3.000 Stroke - 5.090 Rod - 1.600 C/H - .912 x 2.500 - 113 Gram Pin

Bore Weight 58cc 61cc 64cc 68cc Part #
4.000 480 11.17 10.70 10.27 9.75 10466-Std
4.030 485 11.30 10.82 10.38 9.86 10466-030
4.040 490 11.34 10.86 10.42 9.90 10466-040

Dome Volume 8.0cc

If you need some let me know
Ring Grooves 1/16 1/16 3/16

 

[DMAN302]

Looking for opinions on the Wiseco pistons, specifically their part number PT012H3...Considering these for a 302 short block for a buddy of mine, I am just wanting to see if anyone has experience with them.

 

[5spd GT]

PROBE 302 - 3.000 Stroke - 5.090 Rod - 1.600 C/H - .912 x 2.500 - 113 Gram Pin

Bore Weight 58cc 61cc 64cc 68cc Part #
4.000 480 11.17 10.70 10.27 9.75 10466-Std
4.030 485 11.30 10.82 10.38 9.86 10466-030
4.040 490 11.34 10.86 10.42 9.90 10466-040

Dome Volume 8.0cc

If you need some let me know
Ring Grooves 1/16 1/16 3/16

So Rick what could be done to make my compression in the range of 10:2-10:5:1 for a daily driven engine?

I have AFR 165's (58cc) and stock decked block. My cam is rather aggressive in the lift department at .560 with duration being 224* on the intake side...

Whatcha got?

 

[Rick 91GT]

Shoot me a message at [email protected] and I'll see what I can do.

I know of a few pistons that would do it with a stock rod and a stock crank.

 

[Rick 91GT]

How's this sound...

Bore Size: 4.000
Gasket Bore: 4.100
Piston Top Land Dia: 3.965
Stroke: 3.000
Connecting Rod Length 5.090
Compression Height: 1.600
Deck Height: 8.200
Ring to Top of Piston 0.250
Gasket Thickness: 0.040
Valve Notches Volume: 0.00
Dome Volume: 8.00
Volume Head: 58.00
-------------------------------------
:COMPRESSION RATIO: 11.027
-------------------------------------



calculation variables:

Piston to Deck: 0.010
Crank Throw: 1.500
Vol. Above Top Ring: 0.90 cc
Piston to Dec Vol.: 2.06 cc
Gasket Volume: 8.65 cc
Volume Clearance: 61.61 cc
Cylinder Volume: 617.78 cc
CID: 301.474


or if you go with a .050" thick headgasket which ROL makes.

Bore Size: 4.000
Gasket Bore: 4.100
Piston Top Land Dia: 3.965
Stroke: 3.000
Connecting Rod Length 5.090
Compression Height: 1.600
Deck Height: 8.200
Ring to Top of Piston 0.250
Gasket Thickness: 0.050
Valve Notches Volume: 0.00
Dome Volume: 8.00
Volume Head: 58.00
-------------------------------------
:COMPRESSION RATIO: 10.687
-------------------------------------



calculation variables:

Piston to Deck: 0.010
Crank Throw: 1.500
Vol. Above Top Ring: 0.90 cc
Piston to Dec Vol.: 2.06 cc
Gasket Volume: 10.82 cc
Volume Clearance: 63.77 cc
Cylinder Volume: 617.78 cc
CID: 301.474

I can go 4.03" bore also

 

[5spd GT]

Wow, that is some compression

I'll shoot you a more detailed "want list" here after while when I get sometime. I'm very busy...as you are to

I am going to use a .039 headgasket. Ed done sent them off today for me...