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149 head onto 186???????

vh_agent_orange

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hello all

ive been searching but cannot find any info..

can any one tell me if a 149 head will fit on a 186? compression ratios if possible and water jacket differences??

heard that it bolts straight on and gives 10-1 compression but unrealiable source so donot want to go a head yet....

any info will be appreciated

car is 85 rts vk 186 red 5 spd stnd
 

vkberlina

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A 149 head which is off a red motor out of old EH's will give you an increase in compression. Harry Firth did this on 202s. I believe a 161 is the same as the 149 this will give you adjustable rockers & a compression of around 10.25:1, higher with the head machined down. I dont know exact compression numbers I would CC the head and calculate it myself rather than go off secondhand info.

The 149 usually had a single stromberg carbie. But you should be able to bolt on other manifolds and carb combos.

If your bolting it up to a red 202 it will bolt straight up, If your VK is original then it has a black 202. If you bolt a red head on a blue or black 202 then you have to drill to more water jackets in the head or you can block off the two in the block as blue 202's have 2 extra water jackets in the block & head.

If you bang a red head on it without drilling the extra water jackets or blocking off you will have boiling troubles. My thought is they were put in the blue & black 202s for a reason so drill the head.

cheers
Scott
 
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vh_agent_orange

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thank you..

my vk has had a different engine put in it, it is orange in colour and has 186 on the side.... would the 149 head bolt straight on mate?

what gas would you recommend running... or maybey just getting the 186 head skimmed would be best.
dont want to touch bottom end as its the best one ive ever had no oil consumption whatsoever.

161 heads are very hard to come by here in nz

dont want to go 202 as ive heard the 186 is the beter motor

thank you for the reply.

mike
 

vkberlina

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thank you..

my vk has had a different engine put in it, it is orange in colour and has 186 on the side.... would the 149 head bolt straight on mate?

what gas would you recommend running... or maybey just getting the 186 head skimmed would be best.
dont want to touch bottom end as its the best one ive ever had no oil consumption whatsoever.

161 heads are very hard to come by here in nz

dont want to go 202 as ive heard the 186 is the beter motor

thank you for the reply.

mike
Yes will bolt onto the 186

Gas?? If your running LPG on the car dont go over 10:1 compression, get a gas cam for it also when you put the head on, also check your pushrod lengths you may need to change push rods.
As far as a gas system who knows, I would have a look at what the V8 guys run

cheers
Scott
 

Tree cutter

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You will have to run it on premium fuel or it will ping. The 149 head will make your engine pull better at low revs. The 186 head will let your engine rev more if you put stronger valve springs on it because the open combustion chamber shape lets it breath better than the closed chamber design of the 149 head. Fuel economy is much better with the 149 head. Try to get hold of a 186S inlet manifold and carby if you want a bit more power. It is the same 2 barrel carby that is used on 253 red motors with different jets to suit a 6 cylinder motor.
 

vh_agent_orange

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bump..
bought the 149 head for my red 186 block.. just have another couple of questions since you guys know your stuff!
will a 186 twin strongburg carb manifold fit on the 149? and was also thinking is it possible to put 202 valves into the 149?
this is the plan

recond 186 block
149 head machined
(good oversized valves(202 maybe), any recomendations?)
twin strongburg carbies
tuned extractors
nice mild cam
hopefully yella terra rollers
torana diff

aiming for around 200 hp n/a ( what do you think this setup will achieve?)

any suggestions are welcomed for or against and no i dont wont to go v8, love the old straight 6s

it is currently a vk (used to be crappy 4 cyl, but now has 186 block,202 head single strongburg and have the 149 head and torana diff sitting there

thanks heaps! best website community ever!!!!!!

mike
 

vh_agent_orange

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well torana diff can handle alot more than the vk, the diff is 4 link and was running in an v8 escort,also has 13x10 rims for the diff. wont put the link setup in though.heres my smashed up escort mk1 escort ex track car | Trade Me

any one have an idea of compression it will have and what power it will achieve? i assume its been done but every search turns up with nothing
 
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