440 compression
#1
Mopar Fan
Thread Starter
440 compression
Hello everybody ! In first, exuse me if I’m wrong in my sentences because I speak French. In second lets talks for real :
I have a 1970 Dodge Challenger 4 speed with a 440 Magnum, street car.
The 440 engine is from 1973,
Compcams camshaft Street/Strip : Duration 284/296, at @.050 240/246
http://www.compcams.com/Company/CC/c...?csid=709&sb=2
Holley Sniper EFI 800 CFM, Edelbrock Torker II intake, MSD 6AL ignition, stainless exaust.
But I wan’t more compression (about, 9.7:1 / 10.8:1), cylinder heads are stocks (so 82cc if I'm good ?), I didn’t open the motor but I think pistons are stocks too, so my question is :
The best way is to change pistons and cylinder heads, or just piston, or just cylinder ? If cylinder heads what do you thing about the Edelbrock E-Street cylinders heads ? (in 75cc)
http://www.edelbrock.com/automotive/...treet-bb.shtml
Thanks you !
I have a 1970 Dodge Challenger 4 speed with a 440 Magnum, street car.
The 440 engine is from 1973,
Compcams camshaft Street/Strip : Duration 284/296, at @.050 240/246
http://www.compcams.com/Company/CC/c...?csid=709&sb=2
Holley Sniper EFI 800 CFM, Edelbrock Torker II intake, MSD 6AL ignition, stainless exaust.
But I wan’t more compression (about, 9.7:1 / 10.8:1), cylinder heads are stocks (so 82cc if I'm good ?), I didn’t open the motor but I think pistons are stocks too, so my question is :
The best way is to change pistons and cylinder heads, or just piston, or just cylinder ? If cylinder heads what do you thing about the Edelbrock E-Street cylinders heads ? (in 75cc)
http://www.edelbrock.com/automotive/...treet-bb.shtml
Thanks you !
#2
Super Moderator
The heads will give you the best bang for your buck, stock heads are closer to 90 cc. And will out flow your stockers.
#3
Mopar Fan
Thread Starter
#5
Mopar Lover
Looks like your looking to build something like this build? >>>>>>>> http://www.hotrod.com/articles/how-y...hp-street-440/
You might need to check and make sure the gasoline octane in France will be OK?
Keep us posted.... Welcome to the site...
You might need to check and make sure the gasoline octane in France will be OK?
Keep us posted.... Welcome to the site...
#6
Mopar Fan
Thread Starter
Looks like your looking to build something like this build? >>>>>>>> http://www.hotrod.com/articles/how-y...hp-street-440/
You might need to check and make sure the gasoline octane in France will be OK?
Keep us posted.... Welcome to the site...
You might need to check and make sure the gasoline octane in France will be OK?
Keep us posted.... Welcome to the site...
But did someone know the dome volume of factory pistons ?
And a last thing : sorry for my knowledge but it's my first time for engine building (but don't worry I won't be alone for doing that) how did we change the deck clearance of the pistons ?
Thanks
#7
Mopar Lover
This is done with compression height (C.H.) which is the piston pin center line to the top of the piston. When you add C.H. with connecting rod length and 1/2 of crankshaft stroke you will get close to bock height. When comparing pistons look at C.H. first and you'll get close to zero deck and get quench with closed chamber heads.
As an example most Mopar engines have the piston "in the hole" below deck, there were some 340's built with the piston above deck to raise compression with the open chamber heads they had available. When you come to piston selection you will come across some called step pistons, these have a portion of it above the deck for open chamber heads to raise compression and if fit correctly give quench.
I would go with the Performer Head.
As an example most Mopar engines have the piston "in the hole" below deck, there were some 340's built with the piston above deck to raise compression with the open chamber heads they had available. When you come to piston selection you will come across some called step pistons, these have a portion of it above the deck for open chamber heads to raise compression and if fit correctly give quench.
I would go with the Performer Head.
#8
Mopar Lover
This might also help with some under standing... Not 100% that it will cross to French? But worth a try...
http://www.wallaceracing.com/Calculators.htm
http://www.wallaceracing.com/Calculators.htm
#9
Mopar Fan
Thread Starter
RacerHog : don't worry for me, I had learn all 'mecanical' term in english, in car parts I'm better in english than french ! Lol
Coronet 500 : oki doki thanks you !
Coronet 500 : oki doki thanks you !
#11
Mopar Fan
Thread Starter
With E-Street or Performer heads did I can keep factory rocker arms and pushrod or I need something like this https://www.summitracing.com/int/par...1-16/overview/ ??
#13
Mopar Fan
Thread Starter
#15
Mopar Fan
Thread Starter
Its already hapened to me, one pushrod and is lifter death, so if I change cylinder heads I need gaskets, bolts, rocker arms and good pushrod, nothing more ?
The following users liked this post:
Apewalski70 (04-16-2018)
#17
Mopar Fan
Thread Starter
#18
Super Moderator
I have to say I am not an Edelbrock head fan, if your going to spend big money on heads go with Trick Flow 240s or 270s. I know of one .030 over 4.15 stroke 383 on e-85 that made 760 hp with the 240 heads. I have seen to many Edelbrock heads fail for various reasons with Edelbrock refusing to stand behind their products.
#21
Mopar Fan
Thread Starter
lowan / racerhog : okok I take note, didn't have a lot of money, but if I need just more time for something better I can wait and save more money.
Drag Pak : thanks you !
Drag Pak : thanks you !
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