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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 10-19-2007, 10:42 AM   #1
GaryBisiniere
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Default new pistons

i want to take my 306 apart and put some pistons with alittle more compression in. i have edelbrock performer rpm cyclinder heads with 60cc chambers and 1.90 intake and 1.60 exhaust. what should i get for pistons that i can run atleast 11 to 1 for compression. i want to get the most out of this motor i can on pump gas because next year i want to build a boost motor.
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Old 10-19-2007, 12:33 PM   #2
hillbilly pony
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Default RE: new pistons

I got a set of Speed Pro Forged aluminum's 4.030. had #1 and #5 inthe block and realized #5 rod was bent and just bought a 347 kit. I will let tham go for 100 plus shipping.
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Old 10-19-2007, 12:34 PM   #3
hillbilly pony
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Default RE: new pistons

Oh. they are flat top w/fly cuts...should be in the neighbor hood for Comp.
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1987 GT. 13.7:1 408 with TW "R" heads, Probe SRS Flat Tops, custom pro systems 950 carb. .671/671 comp cam. Rollerized C4 w/brake 4800 stall, Strange 31 splines w/spool. 10 point cage, Subframes, 4Cyl springs and 90/10's, 50/50's and lakewood uppers/lowers. 325/50/15's
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Old 10-19-2007, 12:45 PM   #4
67mustang302
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Default RE: new pistons

What's your compression now? 11:1 is rather high to get away with on pump gas, your tune has to be dead nutz on
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Old 10-19-2007, 05:26 PM   #5
GaryBisiniere
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Default RE: new pistons

whats the compression ratio on those pistons? i have 9 to 1 on the hypertech pistons i got now. and i should be able to run up to 12.5 to 1 on pump gas but thats the limit.....
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Old 10-20-2007, 12:22 AM   #6
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Default RE: new pistons

please email me thanks wsgaaarrryyy@aol.com
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Old 10-20-2007, 09:44 AM   #7
mjr46
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Default RE: new pistons

with 60cc cumbustion chambers you won't get close to 11 to 1 at all on a 302 stroke you'll need a dome piston....I have AFR 185'S with 58 cc chambers and have a .200 kieth black .030 dome pistons........they are awesome and they are not forged but call kieth black they have sprayed up to 400 shots on them with no problem..I'm spraying a 100 shot on them...the special silocon tech they use on them allows for a much more durable piston then the standard cheapy hyperutectic design but with the 58 cc heads it yields me 11 to 1 exactlly and I run pump gas no problem with never any pinging as the aluminum heads will allow you to run such higher compression. I reccommend the .200 dome pistons any day as it'll allow pump gas no prob with aluminim heads and the power gain is definatelly noticable..on a similar set up with flat tops I went 12.79 @105...switching to a slightly bigger cam and these pistons..I went 12.24 @ 111.59
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Old 10-20-2007, 11:05 AM   #8
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Default RE: new pistons

you need these.....

Click the image to open in full size.
Click the image to open in full size.

they are TRW / Speed-Pro forged .440 dome, they will put you where you need to be.

http://store.summitracing.com/partde...p;autoview=sku

Deck height: 8.206 in. Deck clearance: 0.016 in. Skirt clearance: 0.0050 in. Weight: 572g. Approximate compression ratios: 12.09:1 with 54.5cc, 11.41:1 with 58.2cc, 11.04:1 with 60.4cc, 10.64:1 with 63cc, and 9.83:1 with 69cc head.

i had these with milled 69 351w heads (approx 58cc) and the block was zero decked....... can you say 12:1 snarling beast?
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Old 10-20-2007, 08:49 PM   #9
94StinkinLincoln
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Default RE: new pistons

i have some JE/SRP pistons -5cc custom psitons, with the exact same heads i have about a 10.5:1 CR
if your interested i might sell them, im thinking of selling the shortblock, if your interested let me know.
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Old 10-20-2007, 08:49 PM
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2249, 331, 440, 50, 60cc, chambers, clearance, dome, ford, hypertech, piston, pistons, probe, skirt, trw

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