Displacement

Loadclr · 01-23-2008

I have a set of Lunati Street Race connecting rods sitting around and was wondering what I would get it for displacement. They are 5.400 and would go in a stock block that is .030 over and on a stock crank. The wrist pin size is .927 for the bigger Chevy wrist pin. Top of the motor would have GT-40P heads, a F303 cam and 1.7 roller rockers. Would I have clearance issues with the connecting rods and with the valves at the top of the pistion? If it all fits, what would I have for displacement?

silvergt · 01-23-2008

changing connecting rod length does not alter displacement. the only things that will change displacement are bore size and stroke length. if you go with a stock stroke 302 and bore it .030 over, you should be at 306 c.i.

Loadclr · 01-23-2008

Quote:

Originally Posted by silvergt

changing connecting rod length does not alter displacement. the only things that will change displacement are bore size and stroke length. if you go with a stock stroke 302 and bore it .030 over, you should be at 306 c.i.

Next question. Would changing the connecting rod length change the compression ratio? And how much would that help or hurt anything?

91gt347 · 01-23-2008

No. It wont change your compression. You would need the right piston to go with the longer rod though. Since you would have to get pistons ,you could make it whatever compression you want though.

silvergt · 01-23-2008

fitz101 · 01-23-2008

01-23-2008	#1 (permalink)
Loadclr 130Stang Real Name: Mike Join Date: Mar 2007 Location: Wichita, KS Posts: 5,988 MySpace ID: 130Stang Facebook ID: Mike Tener iTrader: (1) Friends: (14) Last Online: 11 Hours Ago 01:53 PM Time Spent Online: 3 Weeks 6 Hours 32 Minutes 29 Seconds My Album's: Loadclr's album My Garage: Loadclr's Garage Thanks: 3 Thanked 15 Times in 15 Posts	Displacement I have a set of Lunati Street Race connecting rods sitting around and was wondering what I would get it for displacement. They are 5.400 and would go in a stock block that is .030 over and on a stock crank. The wrist pin size is .927 for the bigger Chevy wrist pin. Top of the motor would have GT-40P heads, a F303 cam and 1.7 roller rockers. Would I have clearance issues with the connecting rods and with the valves at the top of the pistion? If it all fits, what would I have for displacement? __________________ My name is Mike and I have a Mustang addiction. Body of an old man; Heart of a teenager Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting"..........holy shit.......what a ride!" I live with Fear everyday, but sometimes she lets me race............Fear Nothing Improvise, adapt, overcome Live in the country whose flag you want to fly!

01-23-2008	#2 (permalink)
silvergt stangbanger Join Date: May 2007 Posts: 1,142 iTrader: (1) Friends: (8) Last Online: 03-29-2011 07:09 PM Time Spent Online: 4 Days 8 Hours 17 Minutes 39 Seconds My Album's: silvergt's album Thanks: 0 Thanked 12 Times in 12 Posts	changing connecting rod length does not alter displacement. the only things that will change displacement are bore size and stroke length. if you go with a stock stroke 302 and bore it .030 over, you should be at 306 c.i. __________________ speed parts:4.10s, jlt cold air, accufab 75mm tb and plenum, moto blue udp's, MHS stage 2 cams, kooks lt's and catted x , jegs catback, steeda tri-ax, steeda stage 1 clutch, steeda clutch adj. kit, frpp alum. ds, custom tuned by VMP tuning chassis parts: steeda sfc's, steeda dbl adj uca's, lakewood lift bars, eibach springs, kyb shocks and stuts cosmetic: mach 1 grille and chin spoiler, bullitt wheels and fuel door, 20% tint, spoiler delete best e.t : 13.84@99.77 w/2.004 60' (pre-cams)

01-23-2008	#4 (permalink)
91gt347 Dr. Greenthumb Join Date: Oct 2006 Location: MD. Soon to be back home in NC Posts: 2,042 iTrader: (1) Friends: (3) Last Online: 4 Days Ago 04:35 PM Time Spent Online: 2 Days 2 Hours 31 Minutes 26 Seconds My Album's: 91gt347's album Thanks: 0 Thanked 0 Times in 0 Posts	No. It wont change your compression. You would need the right piston to go with the longer rod though. Since you would have to get pistons ,you could make it whatever compression you want though. __________________

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