Compression Ratio.

[Andy302]

Any of you Ford builders out there!!

What would be a good CR to go for on a 302, stock crank & rods with the performer heads? i believe they are a 60cc combustion chamber.

My rods are for press fit pins so i think it rules out Keith Black pistons? (Anyone know)

Edelbrock mention using 9.5:1 on their website (on the dyno graph section).
Desktop dyno says 9.5:1 looks quite good.

Any thoughts out there?

All greatly received.

Andy :}

[Shaney23]

Hi Andy,
I have KB pistons they are press or floating fit.
When I got mine for the 351 (press fit) they came with spiral locks in case you needed them.
You do not fit them if they are press fit rods.
Shane GD 351W

[Andy302]

Thanks!
Are they the Silv-o-lite signature range? P.No UEM-KB115030-8 (for 302) The KB website appears to be off line and most of the suppliers are not clear as to the pressfit / floating fit option. Summit have a nice set at not too much cash which says they come with spiral locks but doesent say if they work with press fit.

Thanks

Andy

[Andy302]

Just answerd my own question, Summit says these are floating pin only!

Which KB's did you get?

Thanks

Andy

[crendonman]

Hi Andy,

Im running a 302 block bored +030" to suit all my 351C innards,with Aussie Quench Heads. Have ported/polished the heads and matched all of the chambers cc (using a pipette and parafin)and hardened exhaust seats, which will gives me 10.2:1.

Any more than that, unleaded will give detonation problems and all sorts of additives would be needed to protect the heads in general.

Before my head gasket went on the way back from the SVA, compression was up at around 11.4:1 (way too much for the road) IMHO{-}

Regards


David

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