merc v6 heads

**TEXAS20225** · 09-28-2015, 09:34 PM

4 sets of cut heads 30,32,33,34 cc trade for uncut unmarked stock heads C4 OR C5 these are all fishing motor heads that have been cut by a forum member and good condition some unrun since cut

**Valero2.5** · 10-07-2015, 08:32 AM

hi, can you explain C4 or C5? i think i have a 200 hp 2.4 200 hp the previous owner said it was put on a 150 midsection and serial numbers say 150hp but i am getting only 74 mph on a Valero Vee Stream, what do you think stock heads were if motor is 86-88? and are 150's diff. from 200's and did they use different tuners? i think more compression is good, i have sorta fresh powerhead that has mid 130 psi on all 6. but someone said it gives more mid range but usually no more top end? ur thoughts?
thanks, JIM

**FUJIMO** · 10-07-2015, 01:20 PM

If you have 130 pounds across the board, you don't need any more. Your good.

**TEXAS20225** · 10-07-2015, 02:18 PM

c4-c5 is the combustion chamber size these both came on 200's thats 488-c4/5 late models, early model 488 c4/5 were opposite smaller numbers were bigger dia

im not sure why they changed it these early heads have the ridges on them