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are 253 and 308 heads the same??

Started by Evan , Mar 29 2006 06:41 PM

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6 replies to this topic

#1 Evan

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Posted 29 March 2006 - 06:41 PM

heya people
going to get a set of heads worked up for a my new 308.
i can get some 253 heads for free.
just was wondering , if they are the same? and can they be worked as hard as 308 heads???

thanks
Evan...

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#2 REDA9X

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Posted 29 March 2006 - 06:45 PM

yep, they are the same. Only time there is a difference is between red blue and black heads

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#3 _[BOTTLEDUP]_

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Posted 29 March 2006 - 07:14 PM

As RED states, they're the same as 308. Only L34s were different with their larger valves. Std heads can be throated out to L34 size, but its not really worth while with cams lifting less than 0.520".

Better off with VN heads if the $$$ will stretch.

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#4 Evan

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Posted 30 March 2006 - 10:15 PM

thanks dave.
the $$ will stretch but then i have to change my extractoors and that cost more too.
how does it go with getting a carby manifold to suit 304 heads?

Evan...

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#5 _[BOTTLEDUP]_

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Posted 31 March 2006 - 02:29 AM

Camshaft is different as well, carb manifolds for VN heads is easy as, if not easier than for early stuff. Harrop, Torque Power, Redline all make singele and dual plane manifolds to cover virtually any engine combo.

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#6 Evan

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Posted 31 March 2006 - 07:10 PM

cam is no problem also , was going to buy a new one anyways.
ive got those yella terra roller rockers to suit an 308, will they still suit 304 heads? im taking they wont.
how much for a manifold , like a tunnel ram kind of thing? $700 - $900??

when you talk about the cam lifting less than 0.520 what does that mean ?? wont the older style 308 heads lift more than that?

Thanks
Evan...

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#7 _Mondie_

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Posted 31 March 2006 - 07:45 PM

While we are discussing heads, does anyone know if Holden put casting dates on their red V8 heads? l have looked but cant find any, perhaps l need to remove a rocker cover?

Cheers