Thread: BBC head change

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I have a chance for a set of '215 heads, same valve size as present '236(peanuts) I have 8.03:1 comp now, with 118 cc's. Will these, '215's give me any appreciable compression?
(seat of the pants feel) or is it to negligable and not worth the valve grind fees?
Fred

215 head were around 95 to 100 cc and bigger port then the small ovals . i do not know what cam you have in it so the small port heads may not be to bad . i would say with the 215 could be worth 25 hp just in the cr gain

Thanks Pat,
pretty mild build, Gross lift 510, Duration @.050, INT=218, EXH=224, Lobe Separation 110 467 cu in

Thanks for response Pat, this is a 467 cu in
CamHyd. Roller, Compcam XR270HR) gross valve lift .510, Duration @.050=INT>218, EXH> 224, Lobe separation=110
Fred

Originally Posted by MaritimeMafia

Thanks for response Pat, this is a 467 cu in
CamHyd. Roller, Compcam XR270HR) gross valve lift .510, Duration @.050=INT>218, EXH> 224, Lobe separation=110
Fred

it should run good with what you have now . there is alot that can be done to get abit more out of the 215 casting as to what you have now hate to put a number on it but with a nice valve job and a few other things i would think over 35 hp over that you have now if you have a good exhaust . that was the head to use back in the early 80s alot of flat top 454 had them heads on them that was the first thing we did when you could buy them things all day for cheap. now there gold to the guy that wants numbers maching engine

35 Hp increase possible? Seat of the pants feel, you think? Thanks for the reply. I know its hard to estimate HP's but what increse with '215's with a
6-71 with 5#'s of boost, would this need a cam change?
MM

if the wheels are hooking up yes should feel it . cam would work ok for a blower

Pat, appreciate replies, take a shot at this.
I know its hard to estimate HP's but what increse with '215's with a
6-71 with 5#'s of boost, would this need a cam change?
MM

Originally Posted by MaritimeMafia

Pat, appreciate replies, take a shot at this.
I know its hard to estimate HP's but what increse with '215's with a
6-71 with 5#'s of boost, would this need a cam change?
MM

no like i said the cam is ok . now you taking about a blower ? with 215 heads then i would go up to a 11/32 valve stem 2.19 1.880 valves and how much hp under boost ? 550hp maybe

Pat, thanks for the responses, this sounds do-able money wise. Even if it hits 500 hp I'll feel it's money well placed. I will be watching your posts as you have a background of reason,not just a "keyboard jockey"!!!!
Larry

its going to be more then 500 and have some dyno time on some blown 650 hp bbc s it just not to that point but some were in the hi 500s is doable