burnz
dah dut dut da dah
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as stated by the other people 149 h/c however 186 has better VEadox said:
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202 motor with 186 head?
- Thread starter pro_gmh
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Q
QIK62C
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hasnt the the 2.85 blue head got a smaller combustion chamber but same size valve while still being 12port
greenfoam
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bangers said:
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
P
portercg
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don't go putting a 149 head on a 202. Just don't. Especially with the blue motors. They are superior to the red motor in every way with the exception of red XU1 motors.
There's 3 versions of blue motor
2.85 high compression - 9.0 to 1
3.3 high compression - 8.8 to 1
3.3 low compression - 7.6 to 1 of which there are bugger all
I can't remember exactly, but I think the 2.85 head has a smaller combustion chamber, valves etc are the same so putting a ported 2.85 head on a 3.3 works out.
you could just about get away with 149 heads on an old 186 because it still had a 3 inch stroke crank. The 3.3 has a 3.25 inch stroke and it starts to get way too hard.
Or if rebuilding you can get flat top pistons which are a better way about it, and a lightened flywheel, hotter cam, + less restrictive exhaust pipe from the manifold back. clean up the ports in the head, makes a massive difference.
I have a factory manual on the blue 6 and V8 motors, feel free if yoyu want specs.
There's 3 versions of blue motor
2.85 high compression - 9.0 to 1
3.3 high compression - 8.8 to 1
3.3 low compression - 7.6 to 1 of which there are bugger all
I can't remember exactly, but I think the 2.85 head has a smaller combustion chamber, valves etc are the same so putting a ported 2.85 head on a 3.3 works out.
you could just about get away with 149 heads on an old 186 because it still had a 3 inch stroke crank. The 3.3 has a 3.25 inch stroke and it starts to get way too hard.
Or if rebuilding you can get flat top pistons which are a better way about it, and a lightened flywheel, hotter cam, + less restrictive exhaust pipe from the manifold back. clean up the ports in the head, makes a massive difference.
I have a factory manual on the blue 6 and V8 motors, feel free if yoyu want specs.
M
mutant
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have ur head machined take a few thou of that will boost ur comp ,but better make sure the bottom end can handle it
pro_gmh
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Yes thanks for all your information, I have gave my VH to my younger brother, so oneday he might be askin the "What should i do to my VH" etc.
I have a VN now so straight 6?? pfft. lol, keep postin the info tho as other ppl may be interested.
I have a VN now so straight 6?? pfft. lol, keep postin the info tho as other ppl may be interested.
SlikUte
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Holden 6
Forget about shoving V8's into a 6 pak bay and red heads on a blue block. That's reversing technology.
With a little thought, the Holden 6 will crap on a V8 from a great height. Some sensible spending would see you with a stroked 202, 12 port head and an infinite variety of induction (triples or a VK EFI setup) and cam options. You'll suddenly have a very quik 235ci 12 second shooter with so much torque, you'll need a kidney belt and a suppository kit to control yourself. Try that in a V8 for the same money and less hassles !
6's rule.
Slik
Forget about shoving V8's into a 6 pak bay and red heads on a blue block. That's reversing technology.
With a little thought, the Holden 6 will crap on a V8 from a great height. Some sensible spending would see you with a stroked 202, 12 port head and an infinite variety of induction (triples or a VK EFI setup) and cam options. You'll suddenly have a very quik 235ci 12 second shooter with so much torque, you'll need a kidney belt and a suppository kit to control yourself. Try that in a V8 for the same money and less hassles !
6's rule.
Slik