dart ss heads

[kd5cue]

i rebuilt 350ci last year intalling a xm 262h cam .125 speed pro pistons,but still using small valve heads,,will set of dart ss large valve heads give me any more rpm,torqe,,im currently pushing a turbo 1 22 pitch at 4500rpm ,,i would like turn it at least 4900rpm ,,will heads help,,thx

[ky-donzi]

I'm guessin with the very mild cam you have probably not much. The larger ports and valves could actually hurt your power at mid range. I'm not that experenced tho.... wait for some more opinions to come in.

[mrfixxall]

i rebuilt 350ci last year intalling a xm 262h cam .125 speed pro pistons,but still using small valve heads,,will set of dart ss large valve heads give me any more rpm,torqe,,im currently pushing a turbo 1 22 pitch at 4500rpm ,,i would like turn it at least 4900rpm ,,will heads help,,thx


Dart ss head have a 170cc intake runner( wouldnt be my choice) with a 202/160 valves..you may lose a lttle bottom end torque but you will gain in the top end:wink:

i would go with a edlbroch rpm alunimum head, stronger valve springs and a 190 cc intake runner..If you havnt already plan on changing your exhaust,,thet would be good for a few hundred rmpm's..

good luck!

[kd5cue]

Dart ss head have a 170cc intake runner( wouldnt be my choice) with a 202/160 valves..you may lose a lttle bottom end torque but you will gain in the top end:wink:

i would go with a edlbroch rpm alunimum head, stronger valve springs and a 190 cc intake runner..If you havnt already plan on changing your exhaust,,thet would be good for a few hundred rmpm's..

good luck!cant get rpms heads out my price range,,would 1.6 roller rocker help any on the dart heads?im runnig glm alum exhaust with 4 inch to the tips

[mrfixxall]

cant get rpms heads out my price range,,would 1.6 roller rocker help any on the dart heads?im runnig glm alum exhaust with 4 inch to the tips

yes 1.6 would help by giving you more cam lift, 1.5 on the intakes and 1.6 on the exhaust would help it breath but you still have a stock style exhaust manifold with a restrictive riser which is probably holding you back with the 125 raised dome pistons..be careful on what cc the combustion chamber size because i dont think you want tobe running racing fuel..78 cc with a 125 dome piston will give you around 10.5 to 1 compression with a -020 deck height depending on what gasket you use..with a alunimum head you shave 1 point of compression because it disapates the heat faster and the engine wont detonate..

rpm heads are around 1000.00 dart ss are around 650.00. i just dont like the tiny valve springs that the dart ss heads have..dart ss heads are rated .550 max cam lift and the rpm heads are rated for .600 lift...mine flo 200cfm at .585 lift because i had flowed..

[kd5cue]

[quote=mrfixxall;443681]yes 1.6 would help by giving you more cam lift, 1.5 on the intakes and 1.6 on the exhaust would help it breath but you still have a stock style exhaust manifold with a restrictive riser which is probably holding you back with the 125 raised dome pistons..be careful on what cc the combustion chamber size because i dont think you want tobe running racing fuel..78 cc with a 125 dome piston will give you around 10.5 to 1 compression with a -020 deck height depending on what gasket you use..with a alunimum head you shave 1 point of compression because it disapates the heat faster and the engine wont detonate.

rpm heads are around 1000.00 dart ss are around 650.00. i just dont like the tiny valve springs that the dart ss heads have..dart ss heads are rated .550 max cam lift and the rpm heads are rated for .600 lift...mine flo 200cfm at .585 lift because i had flowed..[/q with 76cc heads,,what is compression ,,my gross cam lift should be 469/483 with 1.52 rollers,thx for all the info

[kd5cue]

most likely i need stick with a 76 cc head

[kd5cue]

i picked up set of used 60759 performer heads 70cc with straight plugs,,do think ill need longer pushrods?what do think my compression ratio be with .41 head gaskets,,,thx kurt

[mrfixxall]

i picked up set of used 60759 performer heads 70cc with straight plugs,,do think ill need longer pushrods?what do think my compression ratio be with .41 head gaskets,,,thx kurt

too many variations,,try this!


http://www.carcraft.com/techarticles/calculate_compression_ratio/index.html