Carb and head ???'s
 

You guys (and gal's) have been great and your help is appreciated....

was thinking last night about the 89 heads I am putting on my car, If I increase the pistons to 9:1 compression 84 spec's, are the head cc's different in 89?? increasing the compression more than 9:1????

or am I being peranoid (sp)....

Also, the Holley carb I originally intended to order was a 600 (was going to order it today), is that going to be enough or maybe a 650 or 700???

the planned engine mod's should keep me happy for a while, next step will be NOS...

thx again...

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Black, 84 GT, T5, ground effects, shorty headers, dual exh., rear spoiler from a 87.. In the works; 4:10's, 89 ported heads, edelbrock Performer, matched cam and holley carb (?? size)

I believe the chamber volume of the 89 heads is 62cc. You can use an equation to determine any changes.

A 600 cfm carb should be plenty.

Check out www.prestage.com. On the left, click on 'Car Math'. It has some equations that may help.

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Moxie Racing

The Nitrous Oxide Information Site

thank you...

from what I saw, that site has just about everything..... thanks again..

hey there with your mods a 600 will work great i am running a 0-1850s on mine got a great deal working at autozone nice discount.. and look at my mods.. when u go to newer headsi think they have a bigger combustion chamber and smog drilled.. thats why i went with early casting that way they had 58 cc chambers to bump my comp to 10-1...

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84 lx coupe 75 truck block .030 over trw 10-1 pistons comp magnum 280h .512 .512 lift with 230 duration.. early casting heads 1.94 1.60 valves 58 cc chambers harland sharp rockers 1.6 air gap intake with mild porting holley 600 vac seconderies 2 inch open spacer. built man c-4 with PI 2800 sthall 8.8 strange spool 3.73's moser 31 spline still building the rest going for high to mid 11's

The '84 5.0L heads i believe are around 68cc's whereas the later ones (as mentioned by Moxie) are 62cc's. You won't need to get different pistons to get a 9:1 CR (If i read your post correctly, you're considering getting domed pistons???).

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'84 Mustang 5.0 LX
My car

not necessarily domed, the stock pistons have two sets of valve reliefs.... the pistons I ordered were 9:1 (assuming either no valve reliefs or maybe one set??) at 84 302 spec's, and with the smaller chamber on the 89 heads, I was just wondering if that would increase the compression and 600 cfm would be ok....

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Black, 84 GT, T5, ground effects, shorty headers, dual exh., rear spoiler from a 87.. In the works; 4:10's, 89 ported heads, edelbrock Performer, matched cam and holley carb (?? size)