Buick 300 steel heads
Discussion
Ive seen a stroked 3.9 rover with worked over and large porting job(claims biggest valves available) Buick steel heads claiming big horsepower.
Question is,can these heads acheive more horepower and be more ported than a 500 head,and are they compatible with efi,currently 600 cfm carby.
One more thing,are the exhaust manifold bolts in the same location as the RV8.
Cheers Paul
Question is,can these heads acheive more horepower and be more ported than a 500 head,and are they compatible with efi,currently 600 cfm carby.
One more thing,are the exhaust manifold bolts in the same location as the RV8.
Cheers Paul
Hi Paul,
The 300 heads are cast alloy for 63/64 but other years were cast iron. Ports are taller then the rover and imo these heads have more potential. Expect poor casting quality and if second hand they would need renovating. The heads with massive ports are iron from the 340, those have huge ports. Iron heads are heavy mutha's though!
All bolt holes are in the same places so these are a direct fit. Check the alternator location as only one end of the head is drilled for it. You wouldn't want it on the wrong way round
. 300 heads have 54 cc chambers, so do your calcs. They are compatible with efi as the ports are taller, you could notch them if need be.
To sum up, 500 heads are very nice, I think 300 heads fettled properly would be better but I wouldn't use iron 300 heads. Iron 340 heads would make a lot of power but I'd use a tubbie and an aluminium head.
The yank block/heads are further apart so you would have to use a rv8 inlet or make modifications.
Boosted.
The 300 heads are cast alloy for 63/64 but other years were cast iron. Ports are taller then the rover and imo these heads have more potential. Expect poor casting quality and if second hand they would need renovating. The heads with massive ports are iron from the 340, those have huge ports. Iron heads are heavy mutha's though!
All bolt holes are in the same places so these are a direct fit. Check the alternator location as only one end of the head is drilled for it. You wouldn't want it on the wrong way round
. 300 heads have 54 cc chambers, so do your calcs. They are compatible with efi as the ports are taller, you could notch them if need be. To sum up, 500 heads are very nice, I think 300 heads fettled properly would be better but I wouldn't use iron 300 heads. Iron 340 heads would make a lot of power but I'd use a tubbie and an aluminium head.
The yank block/heads are further apart so you would have to use a rv8 inlet or make modifications.
Boosted.
Thanks Mike
The heads are finnished and on a long engine,I need to find out the valve sizes from the guy,the valves guides are offset,inlet port now 54mm,massive outlet ports,260 cam,extended rocker cover for longer valves,so imagine they'd be pretty substantial.He's got 5mm inlet plates for the inlet manifold so would imagine then efi should bolt up then.
Block is 3.5 with 3.9 liners,chev 20 over 302 pistons and a 90mm crank from the Aussie 4.4 P76,so around the 5.0 mark now.
Don't really need it and hasn't been dynoed,but wouldn't mind putting it in the griff for a spin at the right price.
eddited to add
Bugger, its just been sold?
The heads are finnished and on a long engine,I need to find out the valve sizes from the guy,the valves guides are offset,inlet port now 54mm,massive outlet ports,260 cam,extended rocker cover for longer valves,so imagine they'd be pretty substantial.He's got 5mm inlet plates for the inlet manifold so would imagine then efi should bolt up then.
Block is 3.5 with 3.9 liners,chev 20 over 302 pistons and a 90mm crank from the Aussie 4.4 P76,so around the 5.0 mark now.
Don't really need it and hasn't been dynoed,but wouldn't mind putting it in the griff for a spin at the right price.
eddited to add
Bugger, its just been sold?
Edited by v8sag on Thursday 26th April 21:07
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