202 motor with 186 head?
My mate keeps tellin me to fit a 186 head on my blue 202? Why should I do this?
It will alter your compression a little bit...............a 149 head will change it looooots........
If you put a 186 or 149 head on , it will make a smaller space for the fuel/air mix to combust in...... hence, more OOOMPPHHHH............
Last edited by rattattack1313; 09-10-2005 at 05:00 PM. Reason: add more details....
149 - thats a red motor right? what do i have to change to do that? apart from manifolds etc?
Will thats let me get rid of the EGR and all that bs? And what carb does the 149 use? Varajet II?
Um....next question???? I don't know those things, sorry......but on my older Holdens I have owned, I have always hung onto 149 heads, and put them on my 186's, 202's, etc...........I used the 149 manifolds, and the normal carbie...( which was usually a bastard one I had knocked up outa several...).......
Yeh it does thanks, how much do u reckon i can pick up a 149 hed from a wrecker for?
Try and pretend you are doing him a favour by taking it.....................$100 is not a bad price.......manifold as well.........try and get all the hardware that comes with it........WE won!!!!!!!!!!!!!!!!!!!!!!!!!!!! yay!!!!!!!!!!!!!!!!!
GO HOLDEN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Thanks, Did ya see the crash?
Yea......AND ModeRATed at the same time!!!!!!!!!!!!!!!! looooool! !!!!!!
a 186 wont alter the compression a hell of a lot but as you said rat a 149 head which is a red motor out of old EH's will give you a boost in compression. 149's usually had a single stromberg carbie. and as for putting it on your blue 202 you 'll have to drill to more water jackets in the head or it is easier to block off the two in the block as blue 202's have 2 extra water jackets in the block/head so if you bang a red head on it without drilling the extra water jackets you will have boiling troubles
Last edited by Hector martinez; 17-10-2005 at 11:40 AM.
in the dark recesses back in eh days i remember having pushrod problems with this problem.i think i put a 202 head on a 179,result heaps of revs not much compression
Yea...that is reversing the procedure, mate....making the compression area larger, putting that head on it....
I was thinking bout this and arnt the valves smaller? so what u gain in compression, u loose in breathing?
Anyway my plan is to go with a Red 253.
yep ratattack thats exactly what happened.but when your broke you will try anything.i think i filed the tappet pedistal down to because the red 202 has non adjustible tappets.dont try this with a [modern\better] motor
186 and 202 heads have the same size valves so theres no point also theres no blue 186 so yeah if its a blue motor theres no point put a blue 173 head on it if its a blue or black motor also to put a red head on blue motor u have to drill the head out or the block out as water gallories dont line up perfectly
also you have to remember the head gasket wont fit you will have to make the holes but that's minor
There's only one super important thing to do on a 9 port red 202, cut the bolt castings out of the heads ports!, use smaller head bolts with the head of the bolt on the floor of the port and plug the top!, monster power and potential 12 second quarter miles awaits anyone that does this in a light car
It also changes the note heaps. If you listen closely, it sounds great
do you really want to increase your compression that way, the 12 port head on your car is better flowing than the red 9 port, it is more common to fit a 12 port to a red than a 9 port to a black or blue.
why not find a second hand 12 port head that has already had some porting and bigger valves and make the effort a little more worth while, you could end up otherwise with less power and more detonation on ulp.
Also you would need to get new extractors, carb, and inlet manifold if you went to the red head.
Remember street machine magazines "grunt hunt", the standard varijet gave more power than a holley and a holley will usually give more power than the earlier holden carbs so what carb would you run with the red head that is better than the varijet, maybe a 390 would work but they arent common and cheap, neither is the four barrel manifold.
the 149 heads mainly have advantage on red 202's not black & blue.
putting a 186 head on a 202 wont alter compression they are both have the same cc valves ect
<<<There's a good present
thats the way. go a v8, better then the old 202's. they're getting a bit long in the tooth. if you get a 253 just throw a 308 crank in it.Originally Posted by adox
dah dut dut da dah
as stated by the other people 149 h/c however 186 has better VE
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hasnt the the 2.85 blue head got a smaller combustion chamber but same size valve while still being 12port
The 253 and 308 have the same crank, the 253 uses the pistons from the 186, I think (long time since I had to remember this) : ) where the 308 has a 4 inch bore like alot of the Chev small blocks
<<<There's a good present
i could have sworn the only difference was the crank.
you could always use original head and have it shaved
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